ArcMasterChef

{{
  "language": "Solidity",
  "sources": {
    "contracts/ArcMasterChef.sol": {
      "content": "/**\r
 *Submitted for verification at Etherscan.io on 2021-11-26\r
*/\r
\r
// File @openzeppelin/contracts/math/SafeMath.sol@v3.4.2\r
// SPDX-License-Identifier: MIT\r
\r
pragma solidity >=0.6.0 <0.8.0;\r
\r
/**\r
 * @dev Wrappers over Solidity's arithmetic operations with added overflow\r
 * checks.\r
 *\r
 * Arithmetic operations in Solidity wrap on overflow. This can easily result\r
 * in bugs, because programmers usually assume that an overflow raises an\r
 * error, which is the standard behavior in high level programming languages.\r
 * `SafeMath` restores this intuition by reverting the transaction when an\r
 * operation overflows.\r
 *\r
 * Using this library instead of the unchecked operations eliminates an entire\r
 * class of bugs, so it's recommended to use it always.\r
 */\r
library SafeMath {\r
    /**\r
     * @dev Returns the addition of two unsigned integers, with an overflow flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function tryAdd(uint256 a, uint256 b)\r
        internal\r
        pure\r
        returns (bool, uint256)\r
    {\r
        uint256 c = a + b;\r
        if (c < a) return (false, 0);\r
        return (true, c);\r
    }\r
\r
    /**\r
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function trySub(uint256 a, uint256 b)\r
        internal\r
        pure\r
        returns (bool, uint256)\r
    {\r
        if (b > a) return (false, 0);\r
        return (true, a - b);\r
    }\r
\r
    /**\r
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function tryMul(uint256 a, uint256 b)\r
        internal\r
        pure\r
        returns (bool, uint256)\r
    {\r
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the\r
        // benefit is lost if 'b' is also tested.\r
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522\r
        if (a == 0) return (true, 0);\r
        uint256 c = a * b;\r
        if (c / a != b) return (false, 0);\r
        return (true, c);\r
    }\r
\r
    /**\r
     * @dev Returns the division of two unsigned integers, with a division by zero flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function tryDiv(uint256 a, uint256 b)\r
        internal\r
        pure\r
        returns (bool, uint256)\r
    {\r
        if (b == 0) return (false, 0);\r
        return (true, a / b);\r
    }\r
\r
    /**\r
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function tryMod(uint256 a, uint256 b)\r
        internal\r
        pure\r
        returns (bool, uint256)\r
    {\r
        if (b == 0) return (false, 0);\r
        return (true, a % b);\r
    }\r
\r
    /**\r
     * @dev Returns the addition of two unsigned integers, reverting on\r
     * overflow.\r
     *\r
     * Counterpart to Solidity's `+` operator.\r
     *\r
     * Requirements:\r
     *\r
     * - Addition cannot overflow.\r
     */\r
    function add(uint256 a, uint256 b) internal pure returns (uint256) {\r
        uint256 c = a + b;\r
        require(c >= a, "SafeMath: addition overflow");\r
        return c;\r
    }\r
\r
    /**\r
     * @dev Returns the subtraction of two unsigned integers, reverting on\r
     * overflow (when the result is negative).\r
     *\r
     * Counterpart to Solidity's `-` operator.\r
     *\r
     * Requirements:\r
     *\r
     * - Subtraction cannot overflow.\r
     */\r
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {\r
        require(b <= a, "SafeMath: subtraction overflow");\r
        return a - b;\r
    }\r
\r
    /**\r
     * @dev Returns the multiplication of two unsigned integers, reverting on\r
     * overflow.\r
     *\r
     * Counterpart to Solidity's `*` operator.\r
     *\r
     * Requirements:\r
     *\r
     * - Multiplication cannot overflow.\r
     */\r
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {\r
        if (a == 0) return 0;\r
        uint256 c = a * b;\r
        require(c / a == b, "SafeMath: multiplication overflow");\r
        return c;\r
    }\r
\r
    /**\r
     * @dev Returns the integer division of two unsigned integers, reverting on\r
     * division by zero. The result is rounded towards zero.\r
     *\r
     * Counterpart to Solidity's `/` operator. Note: this function uses a\r
     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r
     * uses an invalid opcode to revert (consuming all remaining gas).\r
     *\r
     * Requirements:\r
     *\r
     * - The divisor cannot be zero.\r
     */\r
    function div(uint256 a, uint256 b) internal pure returns (uint256) {\r
        require(b > 0, "SafeMath: division by zero");\r
        return a / b;\r
    }\r
\r
    /**\r
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r
     * reverting when dividing by zero.\r
     *\r
     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r
     * opcode (which leaves remaining gas untouched) while Solidity uses an\r
     * invalid opcode to revert (consuming all remaining gas).\r
     *\r
     * Requirements:\r
     *\r
     * - The divisor cannot be zero.\r
     */\r
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {\r
        require(b > 0, "SafeMath: modulo by zero");\r
        return a % b;\r
    }\r
\r
    /**\r
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on\r
     * overflow (when the result is negative).\r
     *\r
     * CAUTION: This function is deprecated because it requires allocating memory for the error\r
     * message unnecessarily. For custom revert reasons use {trySub}.\r
     *\r
     * Counterpart to Solidity's `-` operator.\r
     *\r
     * Requirements:\r
     *\r
     * - Subtraction cannot overflow.\r
     */\r
    function sub(\r
        uint256 a,\r
        uint256 b,\r
        string memory errorMessage\r
    ) internal pure returns (uint256) {\r
        require(b <= a, errorMessage);\r
        return a - b;\r
    }\r
\r
    /**\r
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on\r
     * division by zero. The result is rounded towards zero.\r
     *\r
     * CAUTION: This function is deprecated because it requires allocating memory for the error\r
     * message unnecessarily. For custom revert reasons use {tryDiv}.\r
     *\r
     * Counterpart to Solidity's `/` operator. Note: this function uses a\r
     * `revert` opcode (which leaves remaining gas untouched) while Solidity\r
     * uses an invalid opcode to revert (consuming all remaining gas).\r
     *\r
     * Requirements:\r
     *\r
     * - The divisor cannot be zero.\r
     */\r
    function div(\r
        uint256 a,\r
        uint256 b,\r
        string memory errorMessage\r
    ) internal pure returns (uint256) {\r
        require(b > 0, errorMessage);\r
        return a / b;\r
    }\r
\r
    /**\r
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),\r
     * reverting with custom message when dividing by zero.\r
     *\r
     * CAUTION: This function is deprecated because it requires allocating memory for the error\r
     * message unnecessarily. For custom revert reasons use {tryMod}.\r
     *\r
     * Counterpart to Solidity's `%` operator. This function uses a `revert`\r
     * opcode (which leaves remaining gas untouched) while Solidity uses an\r
     * invalid opcode to revert (consuming all remaining gas).\r
     *\r
     * Requirements:\r
     *\r
     * - The divisor cannot be zero.\r
     */\r
    function mod(\r
        uint256 a,\r
        uint256 b,\r
        string memory errorMessage\r
    ) internal pure returns (uint256) {\r
        require(b > 0, errorMessage);\r
        return a % b;\r
    }\r
}\r
\r
// File @openzeppelin/contracts-upgradeable/utils/AddressUpgradeable.sol@v3.4.2\r
\r
pragma solidity >=0.6.2 <0.8.0;\r
\r
/**\r
 * @dev Collection of functions related to the address type\r
 */\r
library AddressUpgradeable {\r
    /**\r
     * @dev Returns true if `account` is a contract.\r
     *\r
     * [IMPORTANT]\r
     * ====\r
     * It is unsafe to assume that an address for which this function returns\r
     * false is an externally-owned account (EOA) and not a contract.\r
     *\r
     * Among others, `isContract` will return false for the following\r
     * types of addresses:\r
     *\r
     *  - an externally-owned account\r
     *  - a contract in construction\r
     *  - an address where a contract will be created\r
     *  - an address where a contract lived, but was destroyed\r
     * ====\r
     */\r
    function isContract(address account) internal view returns (bool) {\r
        // This method relies on extcodesize, which returns 0 for contracts in\r
        // construction, since the code is only stored at the end of the\r
        // constructor execution.\r
\r
        uint256 size;\r
        // solhint-disable-next-line no-inline-assembly\r
        assembly {\r
            size := extcodesize(account)\r
        }\r
        return size > 0;\r
    }\r
\r
    /**\r
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r
     * `recipient`, forwarding all available gas and reverting on errors.\r
     *\r
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r
     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r
     * imposed by `transfer`, making them unable to receive funds via\r
     * `transfer`. {sendValue} removes this limitation.\r
     *\r
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r
     *\r
     * IMPORTANT: because control is transferred to `recipient`, care must be\r
     * taken to not create reentrancy vulnerabilities. Consider using\r
     * {ReentrancyGuard} or the\r
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r
     */\r
    function sendValue(address payable recipient, uint256 amount) internal {\r
        require(\r
            address(this).balance >= amount,\r
            "Address: insufficient balance"\r
        );\r
\r
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r
        (bool success, ) = recipient.call{value: amount}("");\r
        require(\r
            success,\r
            "Address: unable to send value, recipient may have reverted"\r
        );\r
    }\r
\r
    /**\r
     * @dev Performs a Solidity function call using a low level `call`. A\r
     * plain`call` is an unsafe replacement for a function call: use this\r
     * function instead.\r
     *\r
     * If `target` reverts with a revert reason, it is bubbled up by this\r
     * function (like regular Solidity function calls).\r
     *\r
     * Returns the raw returned data. To convert to the expected return value,\r
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r
     *\r
     * Requirements:\r
     *\r
     * - `target` must be a contract.\r
     * - calling `target` with `data` must not revert.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCall(address target, bytes memory data)\r
        internal\r
        returns (bytes memory)\r
    {\r
        return functionCall(target, data, "Address: low-level call failed");\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r
     * `errorMessage` as a fallback revert reason when `target` reverts.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCall(\r
        address target,\r
        bytes memory data,\r
        string memory errorMessage\r
    ) internal returns (bytes memory) {\r
        return functionCallWithValue(target, data, 0, errorMessage);\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r
     * but also transferring `value` wei to `target`.\r
     *\r
     * Requirements:\r
     *\r
     * - the calling contract must have an ETH balance of at least `value`.\r
     * - the called Solidity function must be `payable`.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCallWithValue(\r
        address target,\r
        bytes memory data,\r
        uint256 value\r
    ) internal returns (bytes memory) {\r
        return\r
            functionCallWithValue(\r
                target,\r
                data,\r
                value,\r
                "Address: low-level call with value failed"\r
            );\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r
     * with `errorMessage` as a fallback revert reason when `target` reverts.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCallWithValue(\r
        address target,\r
        bytes memory data,\r
        uint256 value,\r
        string memory errorMessage\r
    ) internal returns (bytes memory) {\r
        require(\r
            address(this).balance >= value,\r
            "Address: insufficient balance for call"\r
        );\r
        require(isContract(target), "Address: call to non-contract");\r
\r
        // solhint-disable-next-line avoid-low-level-calls\r
        (bool success, bytes memory returndata) = target.call{value: value}(\r
            data\r
        );\r
        return _verifyCallResult(success, returndata, errorMessage);\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r
     * but performing a static call.\r
     *\r
     * _Available since v3.3._\r
     */\r
    function functionStaticCall(address target, bytes memory data)\r
        internal\r
        view\r
        returns (bytes memory)\r
    {\r
        return\r
            functionStaticCall(\r
                target,\r
                data,\r
                "Address: low-level static call failed"\r
            );\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r
     * but performing a static call.\r
     *\r
     * _Available since v3.3._\r
     */\r
    function functionStaticCall(\r
        address target,\r
        bytes memory data,\r
        string memory errorMessage\r
    ) internal view returns (bytes memory) {\r
        require(isContract(target), "Address: static call to non-contract");\r
\r
        // solhint-disable-next-line avoid-low-level-calls\r
        (bool success, bytes memory returndata) = target.staticcall(data);\r
        return _verifyCallResult(success, returndata, errorMessage);\r
    }\r
\r
    function _verifyCallResult(\r
        bool success,\r
        bytes memory returndata,\r
        string memory errorMessage\r
    ) private pure returns (bytes memory) {\r
        if (success) {\r
            return returndata;\r
        } else {\r
            // Look for revert reason and bubble it up if present\r
            if (returndata.length > 0) {\r
                // The easiest way to bubble the revert reason is using memory via assembly\r
\r
                // solhint-disable-next-line no-inline-assembly\r
                assembly {\r
                    let returndata_size := mload(returndata)\r
                    revert(add(32, returndata), returndata_size)\r
                }\r
            } else {\r
                revert(errorMessage);\r
            }\r
        }\r
    }\r
}\r
\r
// File @openzeppelin/contracts-upgradeable/proxy/Initializable.sol@v3.4.2\r
\r
// solhint-disable-next-line compiler-version\r
pragma solidity >=0.4.24 <0.8.0;\r
\r
/**\r
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed\r
 * behind a proxy. Since a proxied contract can't have a constructor, it's common to move constructor logic to an\r
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer\r
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.\r
 *\r
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as\r
 * possible by providing the encoded function call as the `_data` argument to {UpgradeableProxy-constructor}.\r
 *\r
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure\r
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.\r
 */\r
abstract contract Initializable {\r
    /**\r
     * @dev Indicates that the contract has been initialized.\r
     */\r
    bool private _initialized;\r
\r
    /**\r
     * @dev Indicates that the contract is in the process of being initialized.\r
     */\r
    bool private _initializing;\r
\r
    /**\r
     * @dev Modifier to protect an initializer function from being invoked twice.\r
     */\r
    modifier initializer() {\r
        require(\r
            _initializing || _isConstructor() || !_initialized,\r
            "Initializable: contract is already initialized"\r
        );\r
\r
        bool isTopLevelCall = !_initializing;\r
        if (isTopLevelCall) {\r
            _initializing = true;\r
            _initialized = true;\r
        }\r
\r
        _;\r
\r
        if (isTopLevelCall) {\r
            _initializing = false;\r
        }\r
    }\r
\r
    /// @dev Returns true if and only if the function is running in the constructor\r
    function _isConstructor() private view returns (bool) {\r
        return !AddressUpgradeable.isContract(address(this));\r
    }\r
}\r
\r
// File @openzeppelin/contracts-upgradeable/utils/ContextUpgradeable.sol@v3.4.2\r
\r
pragma solidity >=0.6.0 <0.8.0;\r
\r
/*\r
 * @dev Provides information about the current execution context, including the\r
 * sender of the transaction and its data. While these are generally available\r
 * via msg.sender and msg.data, they should not be accessed in such a direct\r
 * manner, since when dealing with GSN meta-transactions the account sending and\r
 * paying for execution may not be the actual sender (as far as an application\r
 * is concerned).\r
 *\r
 * This contract is only required for intermediate, library-like contracts.\r
 */\r
abstract contract ContextUpgradeable is Initializable {\r
    function __Context_init() internal initializer {\r
        __Context_init_unchained();\r
    }\r
\r
    function __Context_init_unchained() internal initializer {}\r
\r
    function _msgSender() internal view virtual returns (address payable) {\r
        return msg.sender;\r
    }\r
\r
    function _msgData() internal view virtual returns (bytes memory) {\r
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691\r
        return msg.data;\r
    }\r
\r
    uint256[50] private __gap;\r
}\r
\r
// File @openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol@v3.4.2\r
\r
pragma solidity >=0.6.0 <0.8.0;\r
\r
/**\r
 * @dev Contract module which provides a basic access control mechanism, where\r
 * there is an account (an owner) that can be granted exclusive access to\r
 * specific functions.\r
 *\r
 * By default, the owner account will be the one that deploys the contract. This\r
 * can later be changed with {transferOwnership}.\r
 *\r
 * This module is used through inheritance. It will make available the modifier\r
 * `onlyOwner`, which can be applied to your functions to restrict their use to\r
 * the owner.\r
 */\r
abstract contract OwnableUpgradeable is Initializable, ContextUpgradeable {\r
    address private _owner;\r
\r
    event OwnershipTransferred(\r
        address indexed previousOwner,\r
        address indexed newOwner\r
    );\r
\r
    /**\r
     * @dev Initializes the contract setting the deployer as the initial owner.\r
     */\r
    function __Ownable_init() internal initializer {\r
        __Context_init_unchained();\r
        __Ownable_init_unchained();\r
    }\r
\r
    function __Ownable_init_unchained() internal initializer {\r
        address msgSender = _msgSender();\r
        _owner = msgSender;\r
        emit OwnershipTransferred(address(0), msgSender);\r
    }\r
\r
    /**\r
     * @dev Returns the address of the current owner.\r
     */\r
    function owner() public view virtual returns (address) {\r
        return _owner;\r
    }\r
\r
    /**\r
     * @dev Throws if called by any account other than the owner.\r
     */\r
    modifier onlyOwner() {\r
        require(owner() == _msgSender(), "Ownable: caller is not the owner");\r
        _;\r
    }\r
\r
    /**\r
     * @dev Leaves the contract without owner. It will not be possible to call\r
     * `onlyOwner` functions anymore. Can only be called by the current owner.\r
     *\r
     * NOTE: Renouncing ownership will leave the contract without an owner,\r
     * thereby removing any functionality that is only available to the owner.\r
     */\r
    function renounceOwnership() public virtual onlyOwner {\r
        emit OwnershipTransferred(_owner, address(0));\r
        _owner = address(0);\r
    }\r
\r
    /**\r
     * @dev Transfers ownership of the contract to a new account (`newOwner`).\r
     * Can only be called by the current owner.\r
     */\r
    function transferOwnership(address newOwner) public virtual onlyOwner {\r
        require(\r
            newOwner != address(0),\r
            "Ownable: new owner is the zero address"\r
        );\r
        emit OwnershipTransferred(_owner, newOwner);\r
        _owner = newOwner;\r
    }\r
\r
    uint256[49] private __gap;\r
}\r
\r
// File @openzeppelin/contracts-upgradeable/utils/ReentrancyGuardUpgradeable.sol@v3.4.2\r
\r
pragma solidity >=0.6.0 <0.8.0;\r
\r
/**\r
 * @dev Contract module that helps prevent reentrant calls to a function.\r
 *\r
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier\r
 * available, which can be applied to functions to make sure there are no nested\r
 * (reentrant) calls to them.\r
 *\r
 * Note that because there is a single `nonReentrant` guard, functions marked as\r
 * `nonReentrant` may not call one another. This can be worked around by making\r
 * those functions `private`, and then adding `external` `nonReentrant` entry\r
 * points to them.\r
 *\r
 * TIP: If you would like to learn more about reentrancy and alternative ways\r
 * to protect against it, check out our blog post\r
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].\r
 */\r
abstract contract ReentrancyGuardUpgradeable is Initializable {\r
    // Booleans are more expensive than uint256 or any type that takes up a full\r
    // word because each write operation emits an extra SLOAD to first read the\r
    // slot's contents, replace the bits taken up by the boolean, and then write\r
    // back. This is the compiler's defense against contract upgrades and\r
    // pointer aliasing, and it cannot be disabled.\r
\r
    // The values being non-zero value makes deployment a bit more expensive,\r
    // but in exchange the refund on every call to nonReentrant will be lower in\r
    // amount. Since refunds are capped to a percentage of the total\r
    // transaction's gas, it is best to keep them low in cases like this one, to\r
    // increase the likelihood of the full refund coming into effect.\r
    uint256 private constant _NOT_ENTERED = 1;\r
    uint256 private constant _ENTERED = 2;\r
\r
    uint256 private _status;\r
\r
    function __ReentrancyGuard_init() internal initializer {\r
        __ReentrancyGuard_init_unchained();\r
    }\r
\r
    function __ReentrancyGuard_init_unchained() internal initializer {\r
        _status = _NOT_ENTERED;\r
    }\r
\r
    /**\r
     * @dev Prevents a contract from calling itself, directly or indirectly.\r
     * Calling a `nonReentrant` function from another `nonReentrant`\r
     * function is not supported. It is possible to prevent this from happening\r
     * by making the `nonReentrant` function external, and make it call a\r
     * `private` function that does the actual work.\r
     */\r
    modifier nonReentrant() {\r
        // On the first call to nonReentrant, _notEntered will be true\r
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");\r
\r
        // Any calls to nonReentrant after this point will fail\r
        _status = _ENTERED;\r
\r
        _;\r
\r
        // By storing the original value once again, a refund is triggered (see\r
        // https://eips.ethereum.org/EIPS/eip-2200)\r
        _status = _NOT_ENTERED;\r
    }\r
    uint256[49] private __gap;\r
}\r
\r
// File @openzeppelin/contracts/token/ERC20/IERC20.sol@v3.4.2\r
\r
pragma solidity >=0.6.0 <0.8.0;\r
\r
/**\r
 * @dev Interface of the ERC20 standard as defined in the EIP.\r
 */\r
interface IERC20 {\r
    /**\r
     * @dev Returns the amount of tokens in existence.\r
     */\r
    function totalSupply() external view returns (uint256);\r
\r
    /**\r
     * @dev Returns the amount of tokens owned by `account`.\r
     */\r
    function balanceOf(address account) external view returns (uint256);\r
\r
    /**\r
     * @dev Moves `amount` tokens from the caller's account to `recipient`.\r
     *\r
     * Returns a boolean value indicating whether the operation succeeded.\r
     *\r
     * Emits a {Transfer} event.\r
     */\r
    function transfer(address recipient, uint256 amount)\r
        external\r
        returns (bool);\r
\r
    /**\r
     * @dev Returns the remaining number of tokens that `spender` will be\r
     * allowed to spend on behalf of `owner` through {transferFrom}. This is\r
     * zero by default.\r
     *\r
     * This value changes when {approve} or {transferFrom} are called.\r
     */\r
    function allowance(address owner, address spender)\r
        external\r
        view\r
        returns (uint256);\r
\r
    /**\r
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.\r
     *\r
     * Returns a boolean value indicating whether the operation succeeded.\r
     *\r
     * IMPORTANT: Beware that changing an allowance with this method brings the risk\r
     * that someone may use both the old and the new allowance by unfortunate\r
     * transaction ordering. One possible solution to mitigate this race\r
     * condition is to first reduce the spender's allowance to 0 and set the\r
     * desired value afterwards:\r
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729\r
     *\r
     * Emits an {Approval} event.\r
     */\r
    function approve(address spender, uint256 amount) external returns (bool);\r
\r
    /**\r
     * @dev Moves `amount` tokens from `sender` to `recipient` using the\r
     * allowance mechanism. `amount` is then deducted from the caller's\r
     * allowance.\r
     *\r
     * Returns a boolean value indicating whether the operation succeeded.\r
     *\r
     * Emits a {Transfer} event.\r
     */\r
    function transferFrom(\r
        address sender,\r
        address recipient,\r
        uint256 amount\r
    ) external returns (bool);\r
\r
    /**\r
     * @dev Emitted when `value` tokens are moved from one account (`from`) to\r
     * another (`to`).\r
     *\r
     * Note that `value` may be zero.\r
     */\r
    event Transfer(address indexed from, address indexed to, uint256 value);\r
\r
    /**\r
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by\r
     * a call to {approve}. `value` is the new allowance.\r
     */\r
    event Approval(\r
        address indexed owner,\r
        address indexed spender,\r
        uint256 value\r
    );\r
}\r
\r
// File @openzeppelin/contracts/utils/Address.sol@v3.4.2\r
\r
pragma solidity >=0.6.2 <0.8.0;\r
\r
/**\r
 * @dev Collection of functions related to the address type\r
 */\r
library Address {\r
    /**\r
     * @dev Returns true if `account` is a contract.\r
     *\r
     * [IMPORTANT]\r
     * ====\r
     * It is unsafe to assume that an address for which this function returns\r
     * false is an externally-owned account (EOA) and not a contract.\r
     *\r
     * Among others, `isContract` will return false for the following\r
     * types of addresses:\r
     *\r
     *  - an externally-owned account\r
     *  - a contract in construction\r
     *  - an address where a contract will be created\r
     *  - an address where a contract lived, but was destroyed\r
     * ====\r
     */\r
    function isContract(address account) internal view returns (bool) {\r
        // This method relies on extcodesize, which returns 0 for contracts in\r
        // construction, since the code is only stored at the end of the\r
        // constructor execution.\r
\r
        uint256 size;\r
        // solhint-disable-next-line no-inline-assembly\r
        assembly {\r
            size := extcodesize(account)\r
        }\r
        return size > 0;\r
    }\r
\r
    /**\r
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to\r
     * `recipient`, forwarding all available gas and reverting on errors.\r
     *\r
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost\r
     * of certain opcodes, possibly making contracts go over the 2300 gas limit\r
     * imposed by `transfer`, making them unable to receive funds via\r
     * `transfer`. {sendValue} removes this limitation.\r
     *\r
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].\r
     *\r
     * IMPORTANT: because control is transferred to `recipient`, care must be\r
     * taken to not create reentrancy vulnerabilities. Consider using\r
     * {ReentrancyGuard} or the\r
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].\r
     */\r
    function sendValue(address payable recipient, uint256 amount) internal {\r
        require(\r
            address(this).balance >= amount,\r
            "Address: insufficient balance"\r
        );\r
\r
        // solhint-disable-next-line avoid-low-level-calls, avoid-call-value\r
        (bool success, ) = recipient.call{value: amount}("");\r
        require(\r
            success,\r
            "Address: unable to send value, recipient may have reverted"\r
        );\r
    }\r
\r
    /**\r
     * @dev Performs a Solidity function call using a low level `call`. A\r
     * plain`call` is an unsafe replacement for a function call: use this\r
     * function instead.\r
     *\r
     * If `target` reverts with a revert reason, it is bubbled up by this\r
     * function (like regular Solidity function calls).\r
     *\r
     * Returns the raw returned data. To convert to the expected return value,\r
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].\r
     *\r
     * Requirements:\r
     *\r
     * - `target` must be a contract.\r
     * - calling `target` with `data` must not revert.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCall(address target, bytes memory data)\r
        internal\r
        returns (bytes memory)\r
    {\r
        return functionCall(target, data, "Address: low-level call failed");\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with\r
     * `errorMessage` as a fallback revert reason when `target` reverts.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCall(\r
        address target,\r
        bytes memory data,\r
        string memory errorMessage\r
    ) internal returns (bytes memory) {\r
        return functionCallWithValue(target, data, 0, errorMessage);\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r
     * but also transferring `value` wei to `target`.\r
     *\r
     * Requirements:\r
     *\r
     * - the calling contract must have an ETH balance of at least `value`.\r
     * - the called Solidity function must be `payable`.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCallWithValue(\r
        address target,\r
        bytes memory data,\r
        uint256 value\r
    ) internal returns (bytes memory) {\r
        return\r
            functionCallWithValue(\r
                target,\r
                data,\r
                value,\r
                "Address: low-level call with value failed"\r
            );\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but\r
     * with `errorMessage` as a fallback revert reason when `target` reverts.\r
     *\r
     * _Available since v3.1._\r
     */\r
    function functionCallWithValue(\r
        address target,\r
        bytes memory data,\r
        uint256 value,\r
        string memory errorMessage\r
    ) internal returns (bytes memory) {\r
        require(\r
            address(this).balance >= value,\r
            "Address: insufficient balance for call"\r
        );\r
        require(isContract(target), "Address: call to non-contract");\r
\r
        // solhint-disable-next-line avoid-low-level-calls\r
        (bool success, bytes memory returndata) = target.call{value: value}(\r
            data\r
        );\r
        return _verifyCallResult(success, returndata, errorMessage);\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r
     * but performing a static call.\r
     *\r
     * _Available since v3.3._\r
     */\r
    function functionStaticCall(address target, bytes memory data)\r
        internal\r
        view\r
        returns (bytes memory)\r
    {\r
        return\r
            functionStaticCall(\r
                target,\r
                data,\r
                "Address: low-level static call failed"\r
            );\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r
     * but performing a static call.\r
     *\r
     * _Available since v3.3._\r
     */\r
    function functionStaticCall(\r
        address target,\r
        bytes memory data,\r
        string memory errorMessage\r
    ) internal view returns (bytes memory) {\r
        require(isContract(target), "Address: static call to non-contract");\r
\r
        // solhint-disable-next-line avoid-low-level-calls\r
        (bool success, bytes memory returndata) = target.staticcall(data);\r
        return _verifyCallResult(success, returndata, errorMessage);\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],\r
     * but performing a delegate call.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function functionDelegateCall(address target, bytes memory data)\r
        internal\r
        returns (bytes memory)\r
    {\r
        return\r
            functionDelegateCall(\r
                target,\r
                data,\r
                "Address: low-level delegate call failed"\r
            );\r
    }\r
\r
    /**\r
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],\r
     * but performing a delegate call.\r
     *\r
     * _Available since v3.4._\r
     */\r
    function functionDelegateCall(\r
        address target,\r
        bytes memory data,\r
        string memory errorMessage\r
    ) internal returns (bytes memory) {\r
        require(isContract(target), "Address: delegate call to non-contract");\r
\r
        // solhint-disable-next-line avoid-low-level-calls\r
        (bool success, bytes memory returndata) = target.delegatecall(data);\r
        return _verifyCallResult(success, returndata, errorMessage);\r
    }\r
\r
    function _verifyCallResult(\r
        bool success,\r
        bytes memory returndata,\r
        string memory errorMessage\r
    ) private pure returns (bytes memory) {\r
        if (success) {\r
            return returndata;\r
        } else {\r
            // Look for revert reason and bubble it up if present\r
            if (returndata.length > 0) {\r
                // The easiest way to bubble the revert reason is using memory via assembly\r
\r
                // solhint-disable-next-line no-inline-assembly\r
                assembly {\r
                    let returndata_size := mload(returndata)\r
                    revert(add(32, returndata), returndata_size)\r
                }\r
            } else {\r
                revert(errorMessage);\r
            }\r
        }\r
    }\r
}\r
\r
// File @openzeppelin/contracts/token/ERC20/SafeERC20.sol@v3.4.2\r
\r
pragma solidity >=0.6.0 <0.8.0;\r
\r
/**\r
 * @title SafeERC20\r
 * @dev Wrappers around ERC20 operations that throw on failure (when the token\r
 * contract returns false). Tokens that return no value (and instead revert or\r
 * throw on failure) are also supported, non-reverting calls are assumed to be\r
 * successful.\r
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,\r
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.\r
 */\r
library SafeERC20 {\r
    using SafeMath for uint256;\r
    using Address for address;\r
\r
    function safeTransfer(\r
        IERC20 token,\r
        address to,\r
        uint256 value\r
    ) internal {\r
        _callOptionalReturn(\r
            token,\r
            abi.encodeWithSelector(token.transfer.selector, to, value)\r
        );\r
    }\r
\r
    function safeTransferFrom(\r
        IERC20 token,\r
        address from,\r
        address to,\r
        uint256 value\r
    ) internal {\r
        _callOptionalReturn(\r
            token,\r
            abi.encodeWithSelector(token.transferFrom.selector, from, to, value)\r
        );\r
    }\r
\r
    /**\r
     * @dev Deprecated. This function has issues similar to the ones found in\r
     * {IERC20-approve}, and its usage is discouraged.\r
     *\r
     * Whenever possible, use {safeIncreaseAllowance} and\r
     * {safeDecreaseAllowance} instead.\r
     */\r
    function safeApprove(\r
        IERC20 token,\r
        address spender,\r
        uint256 value\r
    ) internal {\r
        // safeApprove should only be called when setting an initial allowance,\r
        // or when resetting it to zero. To increase and decrease it, use\r
        // 'safeIncreaseAllowance' and 'safeDecreaseAllowance'\r
        // solhint-disable-next-line max-line-length\r
        require(\r
            (value == 0) || (token.allowance(address(this), spender) == 0),\r
            "SafeERC20: approve from non-zero to non-zero allowance"\r
        );\r
        _callOptionalReturn(\r
            token,\r
            abi.encodeWithSelector(token.approve.selector, spender, value)\r
        );\r
    }\r
\r
    function safeIncreaseAllowance(\r
        IERC20 token,\r
        address spender,\r
        uint256 value\r
    ) internal {\r
        uint256 newAllowance = token.allowance(address(this), spender).add(\r
            value\r
        );\r
        _callOptionalReturn(\r
            token,\r
            abi.encodeWithSelector(\r
                token.approve.selector,\r
                spender,\r
                newAllowance\r
            )\r
        );\r
    }\r
\r
    function safeDecreaseAllowance(\r
        IERC20 token,\r
        address spender,\r
        uint256 value\r
    ) internal {\r
        uint256 newAllowance = token.allowance(address(this), spender).sub(\r
            value,\r
            "SafeERC20: decreased allowance below zero"\r
        );\r
        _callOptionalReturn(\r
            token,\r
            abi.encodeWithSelector(\r
                token.approve.selector,\r
                spender,\r
                newAllowance\r
            )\r
        );\r
    }\r
\r
    /**\r
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement\r
     * on the return value: the return value is optional (but if data is returned, it must not be false).\r
     * @param token The token targeted by the call.\r
     * @param data The call data (encoded using abi.encode or one of its variants).\r
     */\r
    function _callOptionalReturn(IERC20 token, bytes memory data) private {\r
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since\r
        // we're implementing it ourselves. We use {Address.functionCall} to perform this call, which verifies that\r
        // the target address contains contract code and also asserts for success in the low-level call.\r
\r
        bytes memory returndata = address(token).functionCall(\r
            data,\r
            "SafeERC20: low-level call failed"\r
        );\r
        if (returndata.length > 0) {\r
            // Return data is optional\r
            // solhint-disable-next-line max-line-length\r
            require(\r
                abi.decode(returndata, (bool)),\r
                "SafeERC20: ERC20 operation did not succeed"\r
            );\r
        }\r
    }\r
}\r
\r
// File contracts/ArcMasterChef.sol\r
\r
//** Arc MasterChef Contract */\r
//** Version 2.2.0 */\r
\r
pragma solidity 0.6.12;\r
pragma experimental ABIEncoderV2;\r
\r
contract ArcMasterChef is OwnableUpgradeable, ReentrancyGuardUpgradeable {\r
    using SafeMath for uint256;\r
    using SafeERC20 for IERC20;\r
    // Info of each user.\r
    struct UserInfo {\r
        uint256 amount; // How many LP tokens the user has provided.\r
        uint256 rewardDebt; // Reward debt. See explanation below.\r
        uint256 rewardLockedUp; // Reward locked up.\r
        uint256 nextHarvestUntil; // When can the user harvest again.\r
        //\r
        // We do some fancy math here. Basically, any point in time, the amount of Arcs\r
        // entitled to a user but is pending to be distributed is:\r
        //\r
        //   pending reward = (user.amount * pool.accArcPerShare) - user.rewardDebt\r
        //\r
        // Whenever a user deposits or withdraws LP tokens to a pool. Here's what happens:\r
        //   1. The pool's `accArcPerShare` (and `lastRewardBlock`) gets updated.\r
        //   2. User receives the pending reward sent to his/her address.\r
        //   3. User's `amount` gets updated.\r
        //   4. User's `rewardDebt` gets updated.\r
    }\r
    // Info of each pool.\r
    struct PoolInfo {\r
        IERC20 lpToken; // Address of LP token contract.\r
        uint256 allocPoint; // How many allocation points assigned to this pool. Arcs to distribute per block.\r
        uint256 lastRewardBlock; // Last block number that Arcs distribution occurs.\r
        uint256 accArcPerShare; // Accumulated Arcs per share, times 1e12. See below.\r
        uint16 depositFeeBP; // Deposit fee in basis points\r
        uint256 harvestInterval; // Harvest interval in seconds\r
    }\r
    // The Arc TOKEN!\r
    IERC20 public arc;\r
\r
    // Deposit Fee address\r
    address public feeAddress;\r
    // Reward tokens holder address\r
    address public rewardHolder;\r
    // Arcs tokens created per block. 0.5 Arc per block. 10% to arc charity ( address )\r
    uint256 public arcPerBlock;\r
    // Bonus muliplier for early arc makers.\r
    uint256 public constant BONUS_MULTIPLIER = 1;\r
    // Max harvest interval: 14 days.\r
    uint256 public constant MAXIMUM_HARVEST_INTERVAL = 10 days;\r
    // Info of each pool.\r
    PoolInfo[] public poolInfo;\r
    // Info of each user that stakes LP tokens.\r
    mapping(uint256 => mapping(address => UserInfo)) public userInfo;\r
    // Total allocation points. Must be the sum of all allocation points in all pools.\r
    uint256 public totalAllocPoint;\r
    // The block number when Arcs mining starts.\r
    uint256 public startBlock;\r
    // Total locked up rewards\r
    uint256 public totalLockedUpRewards;\r
    // LP token status\r
    mapping(address => bool) public exists;\r
\r
    event Deposit(address indexed user, uint256 indexed pid, uint256 amount);\r
    event Withdraw(address indexed user, uint256 indexed pid, uint256 amount);\r
    event Compound(address indexed user, uint256 indexed pid, uint256 amount);\r
    event EmergencyWithdraw(\r
        address indexed user,\r
        uint256 indexed pid,\r
        uint256 amount\r
    );\r
    event EmissionRateUpdated(\r
        address indexed caller,\r
        uint256 previousAmount,\r
        uint256 newAmount\r
    );\r
    event RewardLockedUp(\r
        address indexed user,\r
        uint256 indexed pid,\r
        uint256 amountLockedUp\r
    );\r
\r
    function initialize(\r
        address _arc,\r
        address _feeAddress,\r
        address _rewardHolder,\r
        uint256 _startBlock,\r
        uint256 _arcPerBlock\r
    ) public initializer {\r
        arc = IERC20(_arc);\r
        rewardHolder = _rewardHolder;\r
        startBlock = _startBlock;\r
        arcPerBlock = _arcPerBlock;\r
\r
        feeAddress = _feeAddress;\r
        totalAllocPoint = 0;\r
        __Ownable_init();\r
        __ReentrancyGuard_init();\r
    }\r
\r
    function poolLength() external view returns (uint256) {\r
        return poolInfo.length;\r
    }\r
\r
    // Add a new lp to the pool. Can only be called by the owner.\r
    // XXX DO NOT add the same LP token more than once. Rewards will be messed up if you do.\r
    function add(\r
        uint256 _allocPoint,\r
        IERC20 _lpToken,\r
        uint16 _depositFeeBP,\r
        uint256 _harvestInterval,\r
        bool _withUpdate\r
    ) public onlyOwner {\r
        require(!exists[address(_lpToken)], "add: token exists");\r
        exists[address(_lpToken)] = true;\r
\r
        require(_depositFeeBP <= 500, "add: invalid deposit fee basis points");\r
        require(\r
            _harvestInterval <= MAXIMUM_HARVEST_INTERVAL,\r
            "add: invalid harvest interval"\r
        );\r
        if (_withUpdate) {\r
            massUpdatePools();\r
        }\r
        uint256 lastRewardBlock = block.number > startBlock\r
            ? block.number\r
            : startBlock;\r
        totalAllocPoint = totalAllocPoint.add(_allocPoint);\r
        poolInfo.push(\r
            PoolInfo({\r
                lpToken: _lpToken,\r
                allocPoint: _allocPoint,\r
                lastRewardBlock: lastRewardBlock,\r
                accArcPerShare: 0,\r
                depositFeeBP: _depositFeeBP,\r
                harvestInterval: _harvestInterval\r
            })\r
        );\r
    }\r
\r
    // Update the given pool's Arcs allocation point and deposit fee. Can only be called by the owner.\r
    function set(\r
        uint256 _pid,\r
        uint256 _allocPoint,\r
        uint16 _depositFeeBP,\r
        uint256 _harvestInterval,\r
        bool _withUpdate\r
    ) public onlyOwner {\r
        require(_depositFeeBP <= 500, "set: invalid deposit fee basis points");\r
        require(\r
            _harvestInterval <= MAXIMUM_HARVEST_INTERVAL,\r
            "set: invalid harvest interval"\r
        );\r
        if (_withUpdate) {\r
            massUpdatePools();\r
        }\r
        totalAllocPoint = totalAllocPoint.sub(poolInfo[_pid].allocPoint).add(\r
            _allocPoint\r
        );\r
        poolInfo[_pid].allocPoint = _allocPoint;\r
        poolInfo[_pid].depositFeeBP = _depositFeeBP;\r
        poolInfo[_pid].harvestInterval = _harvestInterval;\r
    }\r
\r
    // Return reward multiplier over the given _from to _to block.\r
    function getMultiplier(uint256 _from, uint256 _to)\r
        public\r
        pure\r
        returns (uint256)\r
    {\r
        return _to.sub(_from).mul(BONUS_MULTIPLIER);\r
    }\r
\r
    // View function to see pending Arcs on frontend.\r
    function pendingArc(uint256 _pid, address _user)\r
        external\r
        view\r
        returns (uint256)\r
    {\r
        PoolInfo storage pool = poolInfo[_pid];\r
        UserInfo storage user = userInfo[_pid][_user];\r
        uint256 accArcPerShare = pool.accArcPerShare;\r
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));\r
        if (block.number > pool.lastRewardBlock && lpSupply != 0) {\r
            uint256 multiplier = getMultiplier(\r
                pool.lastRewardBlock,\r
                block.number\r
            );\r
            uint256 arcReward = multiplier\r
                .mul(arcPerBlock)\r
                .mul(pool.allocPoint)\r
                .div(totalAllocPoint);\r
            accArcPerShare = accArcPerShare.add(\r
                arcReward.mul(1e12).div(lpSupply)\r
            );\r
        }\r
        uint256 pending = user.amount.mul(accArcPerShare).div(1e12).sub(\r
            user.rewardDebt\r
        );\r
        return pending.add(user.rewardLockedUp);\r
    }\r
\r
    // View function to see if user can harvest Arcs.\r
    function canHarvest(uint256 _pid, address _user)\r
        public\r
        view\r
        returns (bool)\r
    {\r
        UserInfo storage user = userInfo[_pid][_user];\r
        return block.timestamp >= user.nextHarvestUntil;\r
    }\r
\r
    // Update reward variables for all pools. Be careful of gas spending!\r
    function massUpdatePools() public {\r
        uint256 length = poolInfo.length;\r
        for (uint256 pid = 0; pid < length; ++pid) {\r
            updatePool(pid);\r
        }\r
    }\r
\r
    // Update reward variables of the given pool to be up-to-date.\r
    function updatePool(uint256 _pid) public {\r
        PoolInfo storage pool = poolInfo[_pid];\r
        if (block.number <= pool.lastRewardBlock) {\r
            return;\r
        }\r
        uint256 lpSupply = pool.lpToken.balanceOf(address(this));\r
        if (lpSupply == 0 || pool.allocPoint == 0) {\r
            pool.lastRewardBlock = block.number;\r
            return;\r
        }\r
        uint256 multiplier = getMultiplier(pool.lastRewardBlock, block.number);\r
        uint256 arcReward = multiplier\r
            .mul(arcPerBlock)\r
            .mul(pool.allocPoint)\r
            .div(totalAllocPoint);\r
\r
        pool.accArcPerShare = pool.accArcPerShare.add(\r
            arcReward.mul(1e12).div(lpSupply)\r
        );\r
        pool.lastRewardBlock = block.number;\r
    }\r
\r
    // Deposit LP tokens to MasterChef for Arcs allocation.\r
    function deposit(uint256 _pid, uint256 _amount) public nonReentrant {\r
        PoolInfo storage pool = poolInfo[_pid];\r
        UserInfo storage user = userInfo[_pid][msg.sender];\r
        updatePool(_pid);\r
\r
        payOrLockupPendingArc(_pid);\r
        if (_amount > 0) {\r
            uint256 beforeBalance = pool.lpToken.balanceOf(address(this));\r
            pool.lpToken.safeTransferFrom(\r
                address(msg.sender),\r
                address(this),\r
                _amount\r
            );\r
            _amount = pool.lpToken.balanceOf(address(this)).sub(beforeBalance);\r
            if (pool.depositFeeBP > 0) {\r
                uint256 depositFee = _amount.mul(pool.depositFeeBP).div(10000);\r
                pool.lpToken.safeTransfer(feeAddress, depositFee);\r
                user.amount = user.amount.add(_amount).sub(depositFee);\r
            } else {\r
                user.amount = user.amount.add(_amount);\r
            }\r
        }\r
        user.rewardDebt = user.amount.mul(pool.accArcPerShare).div(1e12);\r
        emit Deposit(msg.sender, _pid, _amount);\r
    }\r
\r
    // Withdraw LP tokens from MasterChef.\r
    function withdraw(uint256 _pid, uint256 _amount) public nonReentrant {\r
        PoolInfo storage pool = poolInfo[_pid];\r
        UserInfo storage user = userInfo[_pid][msg.sender];\r
        require(user.amount >= _amount, "withdraw: not good");\r
        updatePool(_pid);\r
        payOrLockupPendingArc(_pid);\r
        if (_amount > 0) {\r
            user.amount = user.amount.sub(_amount);\r
            pool.lpToken.safeTransfer(address(msg.sender), _amount);\r
        }\r
        user.rewardDebt = user.amount.mul(pool.accArcPerShare).div(1e12);\r
        emit Withdraw(msg.sender, _pid, _amount);\r
    }\r
\r
    // Compound tokens to Arc pool.\r
    function compound(uint256 _pid) public nonReentrant {\r
        PoolInfo storage pool = poolInfo[_pid];\r
        UserInfo storage user = userInfo[_pid][msg.sender];\r
        require(\r
            address(pool.lpToken) == address(arc),\r
            "compound: not able to compound"\r
        );\r
        updatePool(_pid);\r
        uint256 pending = user.amount.mul(pool.accArcPerShare).div(1e12).sub(\r
            user.rewardDebt\r
        );\r
        safeArcTransferFrom(rewardHolder, address(this), pending);\r
        user.amount = user.amount.add(pending);\r
        user.rewardDebt = user.amount.mul(pool.accArcPerShare).div(1e12);\r
        emit Compound(msg.sender, _pid, pending);\r
    }\r
\r
    // Withdraw without caring about rewards. EMERGENCY ONLY.\r
    function emergencyWithdraw(uint256 _pid) public nonReentrant {\r
        PoolInfo storage pool = poolInfo[_pid];\r
        UserInfo storage user = userInfo[_pid][msg.sender];\r
        uint256 amount = user.amount;\r
        user.amount = 0;\r
        user.rewardDebt = 0;\r
        user.rewardLockedUp = 0;\r
        user.nextHarvestUntil = 0;\r
        pool.lpToken.safeTransfer(address(msg.sender), amount);\r
        emit EmergencyWithdraw(msg.sender, _pid, amount);\r
    }\r
\r
    // Pay or lockup pending Arcs.\r
    function payOrLockupPendingArc(uint256 _pid) internal {\r
        PoolInfo storage pool = poolInfo[_pid];\r
        UserInfo storage user = userInfo[_pid][msg.sender];\r
        if (user.nextHarvestUntil == 0) {\r
            user.nextHarvestUntil = block.timestamp.add(pool.harvestInterval);\r
        }\r
        uint256 pending = user.amount.mul(pool.accArcPerShare).div(1e12).sub(\r
            user.rewardDebt\r
        );\r
        if (canHarvest(_pid, msg.sender)) {\r
            if (pending > 0 || user.rewardLockedUp > 0) {\r
                uint256 totalRewards = pending.add(user.rewardLockedUp);\r
                // reset lockup\r
                totalLockedUpRewards = totalLockedUpRewards.sub(\r
                    user.rewardLockedUp\r
                );\r
                user.rewardLockedUp = 0;\r
                user.nextHarvestUntil = block.timestamp.add(\r
                    pool.harvestInterval\r
                );\r
                // send rewards\r
                safeArcTransferFrom(rewardHolder, msg.sender, totalRewards);\r
            }\r
        } else if (pending > 0) {\r
            user.rewardLockedUp = user.rewardLockedUp.add(pending);\r
            totalLockedUpRewards = totalLockedUpRewards.add(pending);\r
            emit RewardLockedUp(msg.sender, _pid, pending);\r
        }\r
    }\r
\r
    // Safe Arc transfer function, just in case if rounding error causes pool to not have enough arcs.\r
    function safeArcTransferFrom(\r
        address _from,\r
        address _to,\r
        uint256 _amount\r
    ) internal {\r
        uint256 arcBal = arc.balanceOf(rewardHolder);\r
        if (_amount > arcBal) {\r
            revert("Not enough balance");\r
        } else {\r
            arc.transferFrom(_from, _to, _amount);\r
        }\r
    }\r
\r
    function setFeeAddress(address _feeAddress) public {\r
        require(msg.sender == feeAddress, "setFeeAddress: FORBIDDEN");\r
        require(_feeAddress != address(0), "setFeeAddress: ZERO");\r
        feeAddress = _feeAddress;\r
    }\r
\r
    function setRewardHolder(address _rewardHolder) public {\r
        require(msg.sender == rewardHolder, "setRewardHolder: FORBIDDEN");\r
        require(_rewardHolder != address(0), "setRewardHolder: ZERO");\r
        rewardHolder = _rewardHolder;\r
    }\r
\r
    // Pancake has to add hidden dummy pools in order to alter the emission, here we make it simple and transparent to all.\r
    function updateEmissionRate(uint256 _arcPerBlock) public onlyOwner {\r
        massUpdatePools();\r
        emit EmissionRateUpdated(msg.sender, arcPerBlock, _arcPerBlock);\r
        arcPerBlock = _arcPerBlock;\r
    }\r
}"
    }
  },
  "settings": {
    "optimizer": {
      "enabled": true,
      "runs": 200
    },
    "outputSelection": {
      "*": {
        "*": [
          "evm.bytecode",
          "evm.deployedBytecode",
          "devdoc",
          "userdoc",
          "metadata",
          "abi"
        ]
      }
    }
  }
}}