S Price: $0.488027 (+8.20%)
    /

    Contract Diff Checker

    Contract Name:
    DeFivePair

    Contract Source Code:

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    import { IDeFiveToken } from "./interfaces/IDeFiveToken.sol";
    
    contract DeFiveLP is IDeFiveToken {
        string public constant override name = "DeFive LP Token";
        string public constant override symbol = "DEFIVE-LP";
        uint8 public constant override decimals = 18;
        uint256 public override totalSupply;
    
        mapping(address => uint256) public override balanceOf;
        mapping(address => mapping(address => uint256)) public override allowance;
    
        bytes32 public override DOMAIN_SEPARATOR;
        bytes32 public constant override PERMIT_TYPEHASH =
            0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    
        mapping(address => uint256) public override nonces;
    
        constructor() {
            DOMAIN_SEPARATOR = keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256(bytes("1")),
                    block.chainid,
                    address(this)
                )
            );
        }
    
        function _mint(address to, uint256 value) internal {
            totalSupply += value;
            balanceOf[to] += value;
            emit Transfer(address(0), to, value);
        }
    
        function _burn(address from, uint256 value) internal {
            balanceOf[from] -= value;
            totalSupply -= value;
            emit Transfer(from, address(0), value);
        }
    
        function _approve(address owner, address spender, uint256 value) private {
            allowance[owner][spender] = value;
            emit Approval(owner, spender, value);
        }
    
        function _transfer(address from, address to, uint256 value) private {
            balanceOf[from] -= value;
            balanceOf[to] += value;
            emit Transfer(from, to, value);
        }
    
        function approve(address spender, uint256 value) external override returns (bool) {
            _approve(msg.sender, spender, value);
            return true;
        }
    
        function transfer(address to, uint256 value) external override returns (bool) {
            _transfer(msg.sender, to, value);
            return true;
        }
    
        function transferFrom(address from, address to, uint256 value) external override returns (bool) {
            if (allowance[from][msg.sender] != type(uint256).max) {
                allowance[from][msg.sender] -= value;
            }
            _transfer(from, to, value);
            return true;
        }
    
        function permit(
            address owner,
            address spender,
            uint256 value,
            uint256 deadline,
            uint8 v,
            bytes32 r,
            bytes32 s
        ) external override {
            require(deadline >= block.timestamp, "DeFive: EXPIRED");
            bytes32 digest = keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR,
                    keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
                )
            );
            address recoveredAddress = ecrecover(digest, v, r, s);
            require(recoveredAddress != address(0) && recoveredAddress == owner, "DeFive: INVALID_SIGNATURE");
            _approve(owner, spender, value);
        }
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    import { IDeFivePair } from "./interfaces/IDeFivePair.sol";
    import { DeFiveLP } from "./DeFiveLP.sol";
    import { Math } from "./libraries/Math.sol";
    import { UQ112x112 } from "./libraries/UQ112x112.sol";
    import { IDeFiveToken } from "./interfaces/IDeFiveToken.sol";
    import { IDeFiveFactory } from "./interfaces/IDeFiveFactory.sol";
    import { IDeFiveCallee } from "./interfaces/IDeFiveCallee.sol";
    
    contract DeFivePair is IDeFivePair, DeFiveLP {
        using UQ112x112 for uint224;
    
        uint256 public constant override MINIMUM_LIQUIDITY = 10 ** 3;
    
        address public override factory;
        address public override token0;
        address public override token1;
    
        uint112 private reserve0;
        uint112 private reserve1;
        uint32 private blockTimestampLast;
    
        uint256 public override price0CumulativeLast;
        uint256 public override price1CumulativeLast;
        uint256 public override kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
    
        uint256 private unlocked = 1;
        modifier lock() {
            require(unlocked == 1, "DeFive: LOCKED");
            unlocked = 0;
            _;
            unlocked = 1;
        }
    
        constructor() {
            factory = msg.sender;
        }
    
        function initialize(address _token0, address _token1) external override {
            require(msg.sender == factory, "DeFive: FORBIDDEN");
            token0 = _token0;
            token1 = _token1;
        }
    
        function getReserves()
            public
            view
            override
            returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast)
        {
            _reserve0 = reserve0;
            _reserve1 = reserve1;
            _blockTimestampLast = blockTimestampLast;
        }
    
        function _safeTransfer(address token, address to, uint256 value) private {
            (bool success, bytes memory data) = token.call(
                abi.encodeWithSelector(IDeFiveToken.transfer.selector, to, value)
            );
            require(success && (data.length == 0 || abi.decode(data, (bool))), "DeFive: TRANSFER_FAILED");
        }
    
        function _update(uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1) private {
            require(balance0 <= type(uint112).max && balance1 <= type(uint112).max, "DeFive: OVERFLOW");
            uint32 blockTimestamp = uint32(block.timestamp % 2 ** 32);
            unchecked {
                uint32 timeElapsed = blockTimestamp - blockTimestampLast;
                if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
                    price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
                    price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
                }
            }
            reserve0 = uint112(balance0);
            reserve1 = uint112(balance1);
            blockTimestampLast = blockTimestamp;
            emit Sync(reserve0, reserve1);
        }
    
        function _mintFee(uint112 _reserve0, uint112 _reserve1) private {
            uint256 _kLast = kLast;
            if (_kLast != 0) {
                uint256 rootK = Math.sqrt(uint256(_reserve0) * _reserve1);
                uint256 rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 liquidity = (totalSupply * (rootK - rootKLast)) / (rootK * 3 + rootKLast);
    
                    if (liquidity > 0) {
                        // Cache factory and fee recipient addresses
                        address _factory = factory;
                        address feeToDevs = IDeFiveFactory(_factory).feeToDevs();
                        address feeToGbm = IDeFiveFactory(_factory).feeToGbm();
    
                        // Mint half liquidity to each fee recipient
                        uint256 halfLiquidity = liquidity / 2;
                        _mint(feeToDevs, halfLiquidity);
                        _mint(feeToGbm, halfLiquidity);
                    }
                }
            }
        }
    
        function mint(address to) external override lock returns (uint256 liquidity) {
            (uint112 _reserve0, uint112 _reserve1, ) = getReserves();
            uint256 balance0 = IDeFiveToken(token0).balanceOf(address(this));
            uint256 balance1 = IDeFiveToken(token1).balanceOf(address(this));
            uint256 amount0 = balance0 - _reserve0;
            uint256 amount1 = balance1 - _reserve1;
    
            _mintFee(_reserve0, _reserve1);
            uint256 _totalSupply = totalSupply;
            if (_totalSupply == 0) {
                liquidity = Math.sqrt(amount0 * amount1) - MINIMUM_LIQUIDITY;
                _mint(address(0), MINIMUM_LIQUIDITY);
            } else {
                liquidity = Math.min((amount0 * _totalSupply) / _reserve0, (amount1 * _totalSupply) / _reserve1);
            }
            require(liquidity > 0, "DeFive: INSUFFICIENT_LIQUIDITY_MINTED");
            _mint(to, liquidity);
    
            _update(balance0, balance1, _reserve0, _reserve1);
            kLast = uint256(reserve0) * reserve1;
            emit Mint(msg.sender, amount0, amount1);
        }
    
        function burn(address to) external override lock returns (uint256 amount0, uint256 amount1) {
            (uint112 _reserve0, uint112 _reserve1, ) = getReserves();
            address _token0 = token0;
            address _token1 = token1;
            uint256 balance0 = IDeFiveToken(_token0).balanceOf(address(this));
            uint256 balance1 = IDeFiveToken(_token1).balanceOf(address(this));
            uint256 liquidity = balanceOf[address(this)];
    
            _mintFee(_reserve0, _reserve1);
            uint256 _totalSupply = totalSupply;
            amount0 = (liquidity * balance0) / _totalSupply;
            amount1 = (liquidity * balance1) / _totalSupply;
            require(amount0 > 0 && amount1 > 0, "DeFive: INSUFFICIENT_LIQUIDITY_BURNED");
            _burn(address(this), liquidity);
            _safeTransfer(_token0, to, amount0);
            _safeTransfer(_token1, to, amount1);
            balance0 = IDeFiveToken(_token0).balanceOf(address(this));
            balance1 = IDeFiveToken(_token1).balanceOf(address(this));
    
            _update(balance0, balance1, _reserve0, _reserve1);
            kLast = uint256(reserve0) * reserve1;
            emit Burn(msg.sender, amount0, amount1, to);
        }
    
        function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external override lock {
            require(amount0Out > 0 || amount1Out > 0, "DeFive: INSUFFICIENT_OUTPUT_AMOUNT");
            (uint112 _reserve0, uint112 _reserve1, ) = getReserves();
            require(amount0Out < _reserve0 && amount1Out < _reserve1, "DeFive: INSUFFICIENT_LIQUIDITY");
            uint256 balance0;
            uint256 balance1;
    
            {
                address _token0 = token0;
                address _token1 = token1;
                require(to != _token0 && to != _token1, "DeFive: INVALID_TO");
                if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out);
                if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out);
    
                if (data.length > 0) IDeFiveCallee(to).deFiveCall(msg.sender, amount0Out, amount1Out, data);
    
                balance0 = IDeFiveToken(_token0).balanceOf(address(this));
                balance1 = IDeFiveToken(_token1).balanceOf(address(this));
            }
    
            uint256 amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
            uint256 amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
            require(amount0In > 0 || amount1In > 0, "DeFive: INSUFFICIENT_INPUT_AMOUNT");
            {
                uint256 balance0Adjusted = balance0 * 10000 - amount0In * 18;
                uint256 balance1Adjusted = balance1 * 10000 - amount1In * 18;
                require(balance0Adjusted * balance1Adjusted >= uint256(_reserve0) * _reserve1 * (10000 ** 2), "DeFive: K");
            }
    
            _update(balance0, balance1, _reserve0, _reserve1);
            emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
        }
    
        function skim(address to) external override lock {
            address _token0 = token0;
            address _token1 = token1;
            _safeTransfer(_token0, to, IDeFiveToken(_token0).balanceOf(address(this)) - reserve0);
            _safeTransfer(_token1, to, IDeFiveToken(_token1).balanceOf(address(this)) - reserve1);
        }
    
        function sync() external override lock {
            _update(
                IDeFiveToken(token0).balanceOf(address(this)),
                IDeFiveToken(token1).balanceOf(address(this)),
                reserve0,
                reserve1
            );
        }
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    interface IDeFiveCallee {
        function deFiveCall(address sender, uint256 amount0, uint256 amount1, bytes calldata data) external;
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    interface IDeFiveFactory {
        event PairCreated(address indexed token0, address indexed token1, address pair, uint256);
    
        event SetFeeToDevs(address indexed sender, address indexed feeToDevs);
    
        event SetFeeToGbm(address indexed sender, address indexed feeToGbm);
    
        event SetFeeToDevsSetter(address indexed sender, address indexed feeToDevsSetter);
    
        event SetFeeToGbmSetter(address indexed sender, address indexed feeToGbmSetter);
    
        function feeToDevs() external view returns (address);
    
        function feeToGbm() external view returns (address);
    
        function feeToDevsSetter() external view returns (address);
    
        function feeToGbmSetter() external view returns (address);
    
        function getPair(address tokenA, address tokenB) external view returns (address pair);
    
        function allPairs(uint256) external view returns (address pair);
    
        function allPairsLength() external view returns (uint256);
    
        function createPair(address tokenA, address tokenB) external returns (address pair);
    
        function setFeeToDevs(address _feeToDevs) external;
    
        function setFeeToGbm(address _feeToGbm) external;
    
        function setFeeToDevsSetter(address _feeToDevsSetter) external;
    
        function setFeeToGbmSetter(address _feeToGbmSetter) external;
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    import { IDeFiveToken } from "./IDeFiveToken.sol";
    
    interface IDeFivePair is IDeFiveToken {
        event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    
        event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    
        event Swap(
            address indexed sender,
            uint256 amount0In,
            uint256 amount1In,
            uint256 amount0Out,
            uint256 amount1Out,
            address indexed to
        );
    
        event Sync(uint112 reserve0, uint112 reserve1);
    
        function MINIMUM_LIQUIDITY() external pure returns (uint256);
    
        function factory() external view returns (address);
    
        function token0() external view returns (address);
    
        function token1() external view returns (address);
    
        function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    
        function price0CumulativeLast() external view returns (uint256);
    
        function price1CumulativeLast() external view returns (uint256);
    
        function kLast() external view returns (uint256);
    
        function mint(address to) external returns (uint256 liquidity);
    
        function burn(address to) external returns (uint256 amount0, uint256 amount1);
    
        function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;
    
        function skim(address to) external;
    
        function sync() external;
    
        function initialize(address, address) external;
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    interface IDeFiveToken {
        event Approval(address indexed owner, address indexed spender, uint256 value);
    
        event Transfer(address indexed from, address indexed to, uint256 value);
    
        function name() external pure returns (string memory);
    
        function symbol() external pure returns (string memory);
    
        function decimals() external pure returns (uint8);
    
        function totalSupply() external view returns (uint256);
    
        function balanceOf(address owner) external view returns (uint256);
    
        function allowance(address owner, address spender) external view returns (uint256);
    
        function approve(address spender, uint256 value) external returns (bool);
    
        function transfer(address to, uint256 value) external returns (bool);
    
        function transferFrom(address from, address to, uint256 value) external returns (bool);
    
        function DOMAIN_SEPARATOR() external view returns (bytes32);
    
        function PERMIT_TYPEHASH() external pure returns (bytes32);
    
        function nonces(address owner) external view returns (uint256);
    
        function permit(
            address owner,
            address spender,
            uint256 value,
            uint256 deadline,
            uint8 v,
            bytes32 r,
            bytes32 s
        ) external;
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    // a library for performing various math operations
    
    library Math {
        function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
            z = x < y ? x : y;
        }
    
        // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
        function sqrt(uint256 y) internal pure returns (uint256 z) {
            if (y > 3) {
                z = y;
                uint256 x = y / 2 + 1;
                while (x < z) {
                    z = x;
                    x = (y / x + x) / 2;
                }
            } else if (y != 0) {
                z = 1;
            }
        }
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    // a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
    
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    
    library UQ112x112 {
        uint224 constant Q112 = 2 ** 112;
    
        // encode a uint112 as a UQ112x112
        function encode(uint112 y) internal pure returns (uint224 z) {
            z = uint224(y) * Q112; // never overflows
        }
    
        // divide a UQ112x112 by a uint112, returning a UQ112x112
        function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
            z = x / uint224(y);
        }
    }

    Contract Name:
    DeFivePair

    Contract Source Code:

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    import { IDeFiveToken } from "./interfaces/IDeFiveToken.sol";
    
    contract DeFiveLP is IDeFiveToken {
        string public constant override name = "DeFive LP Token";
        string public constant override symbol = "DEFIVE-LP";
        uint8 public constant override decimals = 18;
        uint256 public override totalSupply;
    
        mapping(address => uint256) public override balanceOf;
        mapping(address => mapping(address => uint256)) public override allowance;
    
        bytes32 public override DOMAIN_SEPARATOR;
        bytes32 public constant override PERMIT_TYPEHASH =
            0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    
        mapping(address => uint256) public override nonces;
    
        constructor() {
            DOMAIN_SEPARATOR = keccak256(
                abi.encode(
                    keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                    keccak256(bytes(name)),
                    keccak256(bytes("1")),
                    block.chainid,
                    address(this)
                )
            );
        }
    
        function _mint(address to, uint256 value) internal {
            totalSupply += value;
            balanceOf[to] += value;
            emit Transfer(address(0), to, value);
        }
    
        function _burn(address from, uint256 value) internal {
            balanceOf[from] -= value;
            totalSupply -= value;
            emit Transfer(from, address(0), value);
        }
    
        function _approve(address owner, address spender, uint256 value) private {
            allowance[owner][spender] = value;
            emit Approval(owner, spender, value);
        }
    
        function _transfer(address from, address to, uint256 value) private {
            balanceOf[from] -= value;
            balanceOf[to] += value;
            emit Transfer(from, to, value);
        }
    
        function approve(address spender, uint256 value) external override returns (bool) {
            _approve(msg.sender, spender, value);
            return true;
        }
    
        function transfer(address to, uint256 value) external override returns (bool) {
            _transfer(msg.sender, to, value);
            return true;
        }
    
        function transferFrom(address from, address to, uint256 value) external override returns (bool) {
            if (allowance[from][msg.sender] != type(uint256).max) {
                allowance[from][msg.sender] -= value;
            }
            _transfer(from, to, value);
            return true;
        }
    
        function permit(
            address owner,
            address spender,
            uint256 value,
            uint256 deadline,
            uint8 v,
            bytes32 r,
            bytes32 s
        ) external override {
            require(deadline >= block.timestamp, "DeFive: EXPIRED");
            bytes32 digest = keccak256(
                abi.encodePacked(
                    "\x19\x01",
                    DOMAIN_SEPARATOR,
                    keccak256(abi.encode(PERMIT_TYPEHASH, owner, spender, value, nonces[owner]++, deadline))
                )
            );
            address recoveredAddress = ecrecover(digest, v, r, s);
            require(recoveredAddress != address(0) && recoveredAddress == owner, "DeFive: INVALID_SIGNATURE");
            _approve(owner, spender, value);
        }
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    import { IDeFivePair } from "./interfaces/IDeFivePair.sol";
    import { DeFiveLP } from "./DeFiveLP.sol";
    import { Math } from "./libraries/Math.sol";
    import { UQ112x112 } from "./libraries/UQ112x112.sol";
    import { IDeFiveToken } from "./interfaces/IDeFiveToken.sol";
    import { IDeFiveFactory } from "./interfaces/IDeFiveFactory.sol";
    import { IDeFiveCallee } from "./interfaces/IDeFiveCallee.sol";
    
    contract DeFivePair is IDeFivePair, DeFiveLP {
        using UQ112x112 for uint224;
    
        uint256 public constant override MINIMUM_LIQUIDITY = 10 ** 3;
    
        address public override factory;
        address public override token0;
        address public override token1;
    
        uint112 private reserve0;
        uint112 private reserve1;
        uint32 private blockTimestampLast;
    
        uint256 public override price0CumulativeLast;
        uint256 public override price1CumulativeLast;
        uint256 public override kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event
    
        uint256 private unlocked = 1;
        modifier lock() {
            require(unlocked == 1, "DeFive: LOCKED");
            unlocked = 0;
            _;
            unlocked = 1;
        }
    
        constructor() {
            factory = msg.sender;
        }
    
        function initialize(address _token0, address _token1) external override {
            require(msg.sender == factory, "DeFive: FORBIDDEN");
            token0 = _token0;
            token1 = _token1;
        }
    
        function getReserves()
            public
            view
            override
            returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast)
        {
            _reserve0 = reserve0;
            _reserve1 = reserve1;
            _blockTimestampLast = blockTimestampLast;
        }
    
        function _safeTransfer(address token, address to, uint256 value) private {
            (bool success, bytes memory data) = token.call(
                abi.encodeWithSelector(IDeFiveToken.transfer.selector, to, value)
            );
            require(success && (data.length == 0 || abi.decode(data, (bool))), "DeFive: TRANSFER_FAILED");
        }
    
        function _update(uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1) private {
            require(balance0 <= type(uint112).max && balance1 <= type(uint112).max, "DeFive: OVERFLOW");
            uint32 blockTimestamp = uint32(block.timestamp % 2 ** 32);
            unchecked {
                uint32 timeElapsed = blockTimestamp - blockTimestampLast;
                if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
                    price0CumulativeLast += uint256(UQ112x112.encode(_reserve1).uqdiv(_reserve0)) * timeElapsed;
                    price1CumulativeLast += uint256(UQ112x112.encode(_reserve0).uqdiv(_reserve1)) * timeElapsed;
                }
            }
            reserve0 = uint112(balance0);
            reserve1 = uint112(balance1);
            blockTimestampLast = blockTimestamp;
            emit Sync(reserve0, reserve1);
        }
    
        function _mintFee(uint112 _reserve0, uint112 _reserve1) private {
            uint256 _kLast = kLast;
            if (_kLast != 0) {
                uint256 rootK = Math.sqrt(uint256(_reserve0) * _reserve1);
                uint256 rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 liquidity = (totalSupply * (rootK - rootKLast)) / (rootK * 3 + rootKLast);
    
                    if (liquidity > 0) {
                        // Cache factory and fee recipient addresses
                        address _factory = factory;
                        address feeToDevs = IDeFiveFactory(_factory).feeToDevs();
                        address feeToGbm = IDeFiveFactory(_factory).feeToGbm();
    
                        // Mint half liquidity to each fee recipient
                        uint256 halfLiquidity = liquidity / 2;
                        _mint(feeToDevs, halfLiquidity);
                        _mint(feeToGbm, halfLiquidity);
                    }
                }
            }
        }
    
        function mint(address to) external override lock returns (uint256 liquidity) {
            (uint112 _reserve0, uint112 _reserve1, ) = getReserves();
            uint256 balance0 = IDeFiveToken(token0).balanceOf(address(this));
            uint256 balance1 = IDeFiveToken(token1).balanceOf(address(this));
            uint256 amount0 = balance0 - _reserve0;
            uint256 amount1 = balance1 - _reserve1;
    
            _mintFee(_reserve0, _reserve1);
            uint256 _totalSupply = totalSupply;
            if (_totalSupply == 0) {
                liquidity = Math.sqrt(amount0 * amount1) - MINIMUM_LIQUIDITY;
                _mint(address(0), MINIMUM_LIQUIDITY);
            } else {
                liquidity = Math.min((amount0 * _totalSupply) / _reserve0, (amount1 * _totalSupply) / _reserve1);
            }
            require(liquidity > 0, "DeFive: INSUFFICIENT_LIQUIDITY_MINTED");
            _mint(to, liquidity);
    
            _update(balance0, balance1, _reserve0, _reserve1);
            kLast = uint256(reserve0) * reserve1;
            emit Mint(msg.sender, amount0, amount1);
        }
    
        function burn(address to) external override lock returns (uint256 amount0, uint256 amount1) {
            (uint112 _reserve0, uint112 _reserve1, ) = getReserves();
            address _token0 = token0;
            address _token1 = token1;
            uint256 balance0 = IDeFiveToken(_token0).balanceOf(address(this));
            uint256 balance1 = IDeFiveToken(_token1).balanceOf(address(this));
            uint256 liquidity = balanceOf[address(this)];
    
            _mintFee(_reserve0, _reserve1);
            uint256 _totalSupply = totalSupply;
            amount0 = (liquidity * balance0) / _totalSupply;
            amount1 = (liquidity * balance1) / _totalSupply;
            require(amount0 > 0 && amount1 > 0, "DeFive: INSUFFICIENT_LIQUIDITY_BURNED");
            _burn(address(this), liquidity);
            _safeTransfer(_token0, to, amount0);
            _safeTransfer(_token1, to, amount1);
            balance0 = IDeFiveToken(_token0).balanceOf(address(this));
            balance1 = IDeFiveToken(_token1).balanceOf(address(this));
    
            _update(balance0, balance1, _reserve0, _reserve1);
            kLast = uint256(reserve0) * reserve1;
            emit Burn(msg.sender, amount0, amount1, to);
        }
    
        function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external override lock {
            require(amount0Out > 0 || amount1Out > 0, "DeFive: INSUFFICIENT_OUTPUT_AMOUNT");
            (uint112 _reserve0, uint112 _reserve1, ) = getReserves();
            require(amount0Out < _reserve0 && amount1Out < _reserve1, "DeFive: INSUFFICIENT_LIQUIDITY");
            uint256 balance0;
            uint256 balance1;
    
            {
                address _token0 = token0;
                address _token1 = token1;
                require(to != _token0 && to != _token1, "DeFive: INVALID_TO");
                if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out);
                if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out);
    
                if (data.length > 0) IDeFiveCallee(to).deFiveCall(msg.sender, amount0Out, amount1Out, data);
    
                balance0 = IDeFiveToken(_token0).balanceOf(address(this));
                balance1 = IDeFiveToken(_token1).balanceOf(address(this));
            }
    
            uint256 amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
            uint256 amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
            require(amount0In > 0 || amount1In > 0, "DeFive: INSUFFICIENT_INPUT_AMOUNT");
            {
                uint256 balance0Adjusted = balance0 * 10000 - amount0In * 18;
                uint256 balance1Adjusted = balance1 * 10000 - amount1In * 18;
                require(balance0Adjusted * balance1Adjusted >= uint256(_reserve0) * _reserve1 * (10000 ** 2), "DeFive: K");
            }
    
            _update(balance0, balance1, _reserve0, _reserve1);
            emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
        }
    
        function skim(address to) external override lock {
            address _token0 = token0;
            address _token1 = token1;
            _safeTransfer(_token0, to, IDeFiveToken(_token0).balanceOf(address(this)) - reserve0);
            _safeTransfer(_token1, to, IDeFiveToken(_token1).balanceOf(address(this)) - reserve1);
        }
    
        function sync() external override lock {
            _update(
                IDeFiveToken(token0).balanceOf(address(this)),
                IDeFiveToken(token1).balanceOf(address(this)),
                reserve0,
                reserve1
            );
        }
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    interface IDeFiveCallee {
        function deFiveCall(address sender, uint256 amount0, uint256 amount1, bytes calldata data) external;
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    interface IDeFiveFactory {
        event PairCreated(address indexed token0, address indexed token1, address pair, uint256);
    
        event SetFeeToDevs(address indexed sender, address indexed feeToDevs);
    
        event SetFeeToGbm(address indexed sender, address indexed feeToGbm);
    
        event SetFeeToDevsSetter(address indexed sender, address indexed feeToDevsSetter);
    
        event SetFeeToGbmSetter(address indexed sender, address indexed feeToGbmSetter);
    
        function feeToDevs() external view returns (address);
    
        function feeToGbm() external view returns (address);
    
        function feeToDevsSetter() external view returns (address);
    
        function feeToGbmSetter() external view returns (address);
    
        function getPair(address tokenA, address tokenB) external view returns (address pair);
    
        function allPairs(uint256) external view returns (address pair);
    
        function allPairsLength() external view returns (uint256);
    
        function createPair(address tokenA, address tokenB) external returns (address pair);
    
        function setFeeToDevs(address _feeToDevs) external;
    
        function setFeeToGbm(address _feeToGbm) external;
    
        function setFeeToDevsSetter(address _feeToDevsSetter) external;
    
        function setFeeToGbmSetter(address _feeToGbmSetter) external;
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    import { IDeFiveToken } from "./IDeFiveToken.sol";
    
    interface IDeFivePair is IDeFiveToken {
        event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    
        event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    
        event Swap(
            address indexed sender,
            uint256 amount0In,
            uint256 amount1In,
            uint256 amount0Out,
            uint256 amount1Out,
            address indexed to
        );
    
        event Sync(uint112 reserve0, uint112 reserve1);
    
        function MINIMUM_LIQUIDITY() external pure returns (uint256);
    
        function factory() external view returns (address);
    
        function token0() external view returns (address);
    
        function token1() external view returns (address);
    
        function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    
        function price0CumulativeLast() external view returns (uint256);
    
        function price1CumulativeLast() external view returns (uint256);
    
        function kLast() external view returns (uint256);
    
        function mint(address to) external returns (uint256 liquidity);
    
        function burn(address to) external returns (uint256 amount0, uint256 amount1);
    
        function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external;
    
        function skim(address to) external;
    
        function sync() external;
    
        function initialize(address, address) external;
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    interface IDeFiveToken {
        event Approval(address indexed owner, address indexed spender, uint256 value);
    
        event Transfer(address indexed from, address indexed to, uint256 value);
    
        function name() external pure returns (string memory);
    
        function symbol() external pure returns (string memory);
    
        function decimals() external pure returns (uint8);
    
        function totalSupply() external view returns (uint256);
    
        function balanceOf(address owner) external view returns (uint256);
    
        function allowance(address owner, address spender) external view returns (uint256);
    
        function approve(address spender, uint256 value) external returns (bool);
    
        function transfer(address to, uint256 value) external returns (bool);
    
        function transferFrom(address from, address to, uint256 value) external returns (bool);
    
        function DOMAIN_SEPARATOR() external view returns (bytes32);
    
        function PERMIT_TYPEHASH() external pure returns (bytes32);
    
        function nonces(address owner) external view returns (uint256);
    
        function permit(
            address owner,
            address spender,
            uint256 value,
            uint256 deadline,
            uint8 v,
            bytes32 r,
            bytes32 s
        ) external;
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    // a library for performing various math operations
    
    library Math {
        function min(uint256 x, uint256 y) internal pure returns (uint256 z) {
            z = x < y ? x : y;
        }
    
        // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
        function sqrt(uint256 y) internal pure returns (uint256 z) {
            if (y > 3) {
                z = y;
                uint256 x = y / 2 + 1;
                while (x < z) {
                    z = x;
                    x = (y / x + x) / 2;
                }
            } else if (y != 0) {
                z = 1;
            }
        }
    }

    // SPDX-License-Identifier: MIT
    pragma solidity =0.8.4;
    
    // a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
    
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    
    library UQ112x112 {
        uint224 constant Q112 = 2 ** 112;
    
        // encode a uint112 as a UQ112x112
        function encode(uint112 y) internal pure returns (uint224 z) {
            z = uint224(y) * Q112; // never overflows
        }
    
        // divide a UQ112x112 by a uint112, returning a UQ112x112
        function uqdiv(uint224 x, uint112 y) internal pure returns (uint224 z) {
            z = x / uint224(y);
        }
    }

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