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// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity =0.5.16;

import "./ZFPair.sol";
import "./interfaces/IZFPair.sol";
import "./interfaces/IZFFactory.sol";

contract ZFFactory is IZFFactory {
    bytes32 public constant INIT_CODE_PAIR_HASH = keccak256(abi.encodePacked(type(ZFPair).creationCode));

    /// @dev Address of fee manager
    address public feeTo;
    /// @dev Who can set the address for fee manager
    address public feeToSetter;

    /// @dev Returns pair for tokens, address sorting is not required
    mapping(address => mapping(address => address)) public getPair;
    /// @dev All existing pairs
    address[] public allPairs;

    /// @dev Swap fee in basis points (1 basis point = 0.01%)
    /// @dev 20 = 0.2%, 100 = 1%, 1000 = 10%
    uint16 public swapFee = 20; // 0.2%, in 10000 precision

    /// @dev Protocol fee as percentage of swap fee, in basis points
    /// @dev default 3500 = 35% of swap fee goes to protocol
    uint16 public protocolFee = 3200;

    // ----- EVENTS -----

    /// @dev Emitted when a new pair is created
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256 allPairsLength);

    /// @dev Emitted when feeTo is updated
    event FeeToSet(address indexed feeTo);

    /// @dev Emitted when feeToSetter is updated
    event FeeToSetterSet(address indexed feeToSetter);

    /// @dev Emitted when swap fee is updated
    event SwapFeeSet(uint16 newSwapFee);

    /// @dev Emitted when protocol fee is updated
    event ProtocolFeeSet(uint16 newProtocolFee);

    /// @dev Emitted when swap fee override is set for a pair
    event SwapFeeOverrideSet(address indexed pair, uint16 swapFeeOverride);

    /// @dev Emitted when protocol fee override is set for a pair
    event ProtocolFeeOverrideSet(address indexed pair, uint16 protocolFeeOverride);

    modifier onlyFeeToSetter() {
        require(msg.sender == feeToSetter, "ZF: FORBIDDEN");
        _;
    }

    constructor(address _feeToSetter) public {
        feeToSetter = _feeToSetter;
    }

    /// @dev Returns the length of all pairs
    function allPairsLength() external view returns (uint256) {
        return allPairs.length;
    }

    function createPair(address tokenA, address tokenB) external returns (address pair) {
        require(tokenA != tokenB, "ZF: IDENTICAL_ADDRESSES");
        (address token0, address token1) = tokenA < tokenB ? (tokenA, tokenB) : (tokenB, tokenA);
        require(token0 != address(0), "ZF: ZERO_ADDRESS");
        require(getPair[token0][token1] == address(0), "ZF: PAIR_EXISTS"); // single check is sufficient
        bytes memory bytecode = type(ZFPair).creationCode;
        bytes32 salt = keccak256(abi.encodePacked(token0, token1));
        assembly {
            pair := create2(0, add(bytecode, 32), mload(bytecode), salt)
        }
        require(pair != address(0), "ZF: FAILED_TO_CREATE_PAIR");
        IZFPair(pair).initialize(token0, token1);
        getPair[token0][token1] = pair;
        getPair[token1][token0] = pair; // populate mapping in the reverse direction
        allPairs.push(pair);
        emit PairCreated(token0, token1, pair, allPairs.length);
    }

    /// @dev Sets the address of fee manager
    function setFeeTo(address _feeTo) external onlyFeeToSetter {
        feeTo = _feeTo;
        emit FeeToSet(_feeTo);
    }

    /// @dev Sets swap fee base point
    function setSwapFee(uint16 _newFee) external onlyFeeToSetter {
        require(_newFee <= 1000, "ZF: SWAP_FEE_TOO_HIGH"); // max 10%
        swapFee = _newFee;
        emit SwapFeeSet(_newFee);
    }

    /// @dev Sets protocol fee
    function setProtocolFee(uint16 _newFee) external onlyFeeToSetter {
        require(_newFee <= 10000, "ZF: INVALID_PROTOCOL_FEE");
        protocolFee = _newFee;
        emit ProtocolFeeSet(_newFee);
    }

    /// @dev Sets the address of setter for fee manager
    function setFeeToSetter(address _feeToSetter) external onlyFeeToSetter {
        feeToSetter = _feeToSetter;
        emit FeeToSetterSet(_feeToSetter);
    }

    /// @dev Sets swap fee point for a pair
    function setSwapFeeOverride(address _pair, uint16 _swapFeeOverride) external onlyFeeToSetter {
        ZFPair(_pair).setSwapFeeOverride(_swapFeeOverride);
        emit SwapFeeOverrideSet(_pair, _swapFeeOverride);
    }

    /// @dev Sets protocol fee for a specific pair
    function setProtocolFeeOverride(address _pair, uint16 _protocolFeeOverride) external onlyFeeToSetter {
        ZFPair(_pair).setProtocolFeeOverride(_protocolFeeOverride);
        emit ProtocolFeeOverrideSet(_pair, _protocolFeeOverride);
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity =0.5.16;

import "./interfaces/IZFPair.sol";
import "./interfaces/IUniswapV2Callee.sol";
import "./ZFERC20.sol";
import "./libraries/Math.sol";
import "./libraries/UQ112x112.sol";
import "./interfaces/IERC20.sol";
import "./interfaces/IZFFactory.sol";
import "./libraries/SafeMath.sol";

contract ZFPair is IZFPair, ZFERC20 {
    using SafeMath for uint256;
    using UQ112x112 for uint224;

    bytes4 private constant SELECTOR = bytes4(keccak256(bytes("transfer(address,uint256)")));

    uint256 private constant SWAP_FEE_POINT_PRECISION_SQ = 10000_0000;
    uint256 private constant SWAP_FEE_POINT_PRECISION = 10000;
    uint256 private constant PROTOCOL_FEE_POINT_PRECISION = 10000;
    uint256 private constant MINIMUM_LIQUIDITY = 10 ** 3;
    uint16 private constant SWAP_FEE_INHERIT = uint16(-1);
    uint16 private constant PROTOCOL_FEE_INHERIT = uint16(-1);

    address public factory;
    address public token0;
    address public token1;

    uint112 private reserve0; // uses single storage slot, accessible via getReserves
    uint112 private reserve1; // uses single storage slot, accessible via getReserves
    uint32 private blockTimestampLast; // uses single storage slot, accessible via getReserves

    uint256 public price0CumulativeLast;
    uint256 public price1CumulativeLast;
    uint256 public kLast; // reserve0 * reserve1, as of immediately after the most recent liquidity event

    uint16 public swapFeeOverride = SWAP_FEE_INHERIT;
    uint16 public protocolFeeOverride = PROTOCOL_FEE_INHERIT;

    uint256 private unlocked = 1;

    modifier lock() {
        require(unlocked == 1, "ZF: LOCKED");
        unlocked = 0;
        _;
        unlocked = 1;
    }

    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);

    constructor() public {
        factory = msg.sender;
    }

    // called once by the factory at time of deployment
    function initialize(address _token0, address _token1) external {
        require(msg.sender == factory, "ZF: FORBIDDEN"); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    function getReserves() public view returns (uint112 _reserve0, uint112 _reserve1, uint32 _blockTimestampLast) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _blockTimestampLast = blockTimestampLast;
    }

    function getReservesSimple() external view returns (uint112, uint112) {
        return (reserve0, reserve1);
    }

    function getSwapFee() public view returns (uint16) {
        uint16 _swapFeeOverride = swapFeeOverride;
        return _swapFeeOverride == SWAP_FEE_INHERIT ? IZFFactory(factory).swapFee() : _swapFeeOverride;
    }

    function getProtocolFee() public view returns (uint256) {
        uint16 _protocolFeeOverride = protocolFeeOverride;
        return _protocolFeeOverride == PROTOCOL_FEE_INHERIT ? IZFFactory(factory).protocolFee() : _protocolFeeOverride;
    }

    function getReservesAndParameters() external view returns (uint112 _reserve0, uint112 _reserve1, uint16 _swapFee) {
        _reserve0 = reserve0;
        _reserve1 = reserve1;
        _swapFee = getSwapFee();
    }

    function _getBalances(address _token0, address _token1) private view returns (uint256, uint256) {
        return (IERC20(_token0).balanceOf(address(this)), IERC20(_token1).balanceOf(address(this)));
    }

    function _safeTransfer(address token, address to, uint256 value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "ZF: TRANSFER_FAILED");
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint256 balance0, uint256 balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), "ZF: OVERFLOW");

        uint32 blockTimestamp = uint32(block.timestamp % 2 ** 32);
        uint32 timeElapsed = blockTimestamp - blockTimestampLast; // overflow is desired
        if (timeElapsed > 0 && _reserve0 != 0 && _reserve1 != 0) {
            // * never overflows, and + overflow is desired
            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 _getFeeLiquidity(uint256 _totalSupply, uint256 _rootK2, uint256 _rootK1) private view returns (uint256) {
        uint256 _protocolFee = getProtocolFee();
        uint256 numerator = _totalSupply.mul(_rootK2.sub(_rootK1)).mul(_protocolFee);
        uint256 denominator =
            (PROTOCOL_FEE_POINT_PRECISION.sub(_protocolFee)).mul(_rootK2).add(_rootK1.mul(_protocolFee));
        return numerator / denominator;
    }

    function _mintFee(uint112 _reserve0, uint112 _reserve1) private returns (bool feeOn) {
        address _feeTo = IZFFactory(factory).feeTo();
        feeOn = _feeTo != address(0);
        uint256 _kLast = kLast;
        if (feeOn) {
            if (_kLast != 0) {
                uint256 rootK = Math.sqrt(uint256(_reserve0).mul(_reserve1));
                uint256 rootKLast = Math.sqrt(_kLast);
                if (rootK > rootKLast) {
                    uint256 liquidity = _getFeeLiquidity(totalSupply, rootK, rootKLast);
                    if (liquidity > 0) _mint(_feeTo, liquidity);
                }
            }
        } else if (_kLast != 0) {
            kLast = 0;
        }
    }

    /// @dev this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint256 liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves();
        (uint256 balance0, uint256 balance1) = _getBalances(token0, token1);
        uint256 amount0 = balance0.sub(_reserve0);
        uint256 amount1 = balance1.sub(_reserve1);

        bool feeOn = _mintFee(_reserve0, _reserve1);
        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        if (_totalSupply == 0) {
            liquidity = Math.sqrt(amount0.mul(amount1)).sub(MINIMUM_LIQUIDITY);
            _mint(address(0), MINIMUM_LIQUIDITY); // permanently lock the first MINIMUM_LIQUIDITY tokens
        } else {
            liquidity = Math.min(amount0.mul(_totalSupply) / _reserve0, amount1.mul(_totalSupply) / _reserve1);
        }
        require(liquidity > 0, "ZF: INSUFFICIENT_LIQUIDITY_MINTED");
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date

        emit Mint(msg.sender, amount0, amount1);
    }

    /// @dev this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint256 amount0, uint256 amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        (address _token0, address _token1) = (token0, token1);
        (uint256 balance0, uint256 balance1) = _getBalances(_token0, _token1);
        uint256 liquidity = balanceOf[address(this)];

        bool feeOn = _mintFee(_reserve0, _reserve1);

        uint256 _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee

        // using balances ensures pro-rata distribution
        amount0 = liquidity.mul(balance0) / _totalSupply;
        amount1 = liquidity.mul(balance1) / _totalSupply;
        require(amount0 > 0 && amount1 > 0, "ZF: INSUFFICIENT_LIQUIDITY_BURNED");

        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);

        (balance0, balance1) = _getBalances(_token0, _token1);
        _update(balance0, balance1, _reserve0, _reserve1);

        if (feeOn) kLast = uint256(reserve0).mul(reserve1); // reserve0 and reserve1 are up-to-date

        emit Burn(msg.sender, amount0, amount1, to);
    }

    /// @dev this low-level function should be called from a contract which performs important safety checks
    function swap(uint256 amount0Out, uint256 amount1Out, address to, bytes calldata data) external lock {
        require(amount0Out > 0 || amount1Out > 0, "ZF: INSUFFICIENT_OUTPUT_AMOUNT");
        (uint112 _reserve0, uint112 _reserve1,) = getReserves();
        require(amount0Out < _reserve0 && amount1Out < _reserve1, "ZF: INSUFFICIENT_LIQUIDITY");

        uint256 balance0;
        uint256 balance1;
        {
            // scope for _token{0,1}, avoids stack too deep errors
            (address _token0, address _token1) = (token0, token1);

            require(to != _token0 && to != _token1, "ZF: INVALID_TO");

            if (amount0Out > 0) _safeTransfer(_token0, to, amount0Out); // optimistically transfer tokens
            if (amount1Out > 0) _safeTransfer(_token1, to, amount1Out); // optimistically transfer tokens
            if (data.length > 0) IUniswapV2Callee(to).uniswapV2Call(msg.sender, amount0Out, amount1Out, data);

            (balance0, balance1) = _getBalances(_token0, _token1);
        }

        // At least one input is required.
        uint256 amount0In = balance0 > _reserve0 - amount0Out ? balance0 - (_reserve0 - amount0Out) : 0;
        uint256 amount1In = balance1 > _reserve1 - amount1Out ? balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, "ZF: INSUFFICIENT_INPUT_AMOUNT");

        {
            // Checks the K.
            uint16 _swapFee = getSwapFee();
            uint256 balance0Adjusted = (balance0.mul(SWAP_FEE_POINT_PRECISION).sub(amount0In.mul(_swapFee)));
            uint256 balance1Adjusted = (balance1.mul(SWAP_FEE_POINT_PRECISION).sub(amount1In.mul(_swapFee)));

            require(
                balance0Adjusted.mul(balance1Adjusted)
                    >= uint256(_reserve0).mul(_reserve1).mul(SWAP_FEE_POINT_PRECISION_SQ),
                "ZF: K"
            );
        }

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to);
    }

    /**
     * @dev Force balances to match reserves, taking out positive balances
     */
    function skim(address to) external lock {
        address _token0 = token0;
        address _token1 = token1;
        (uint256 balance0, uint256 balance1) = _getBalances(_token0, _token1);
        _safeTransfer(_token0, to, balance0.sub(reserve0));
        _safeTransfer(_token1, to, balance1.sub(reserve1));
    }

    /**
     * @dev Force reserves to match balances
     */
    function sync() external lock {
        (uint256 balance0, uint256 balance1) = _getBalances(token0, token1);
        _update(balance0, balance1, reserve0, reserve1);
    }

    /// @dev called by the factory to set the swapFeeOverride
    function setSwapFeeOverride(uint16 _swapFeeOverride) external {
        require(msg.sender == factory, "ZF: FORBIDDEN");
        require(_swapFeeOverride <= 1000 || _swapFeeOverride == SWAP_FEE_INHERIT, "INVALID_FEE"); //max 10%
        swapFeeOverride = _swapFeeOverride;
    }

    /// @dev Called by factory to set pair-specific protocol fee
    function setProtocolFeeOverride(uint16 _protocolFee) external {
        require(msg.sender == factory, "ZF: FORBIDDEN");
        require(_protocolFee <= PROTOCOL_FEE_POINT_PRECISION, "INVALID PROTOCOL_FEE"); // max 100%
        protocolFeeOverride = _protocolFee;
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0;

interface IZFPair {
    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;

    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 getReservesAndParameters() external view returns (uint112 reserve0, uint112 reserve1, uint16 swapFee);

    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: GPL-3.0
pragma solidity >=0.5.0;

interface IZFFactory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint256);

    function feeTo() external view returns (address);

    function feeToSetter() 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 setFeeTo(address) external;

    function setFeeToSetter(address) external;

    function INIT_CODE_PAIR_HASH() external view returns (bytes32);

    function swapFee() external view returns (uint16);

    function protocolFee() external view returns (uint16);

    function setSwapFee(uint16 newFee) external;

    function setProtocolFee(uint16 newFee) external;

    function setSwapFeeOverride(address pair, uint16 swapFeeOverride) external;

    function setProtocolFeeOverride(address pair, uint16 protocolFeeOverride) external;
}

// SPDX-License-Identifier: AGPL-3.0-or-later

pragma solidity >=0.5.0;

/// @dev Uniswap V2 callee interface
interface IUniswapV2Callee {
    function uniswapV2Call(address sender, uint256 amount0, uint256 amount1, bytes calldata data) external;
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity =0.5.16;

import "./interfaces/IZFERC20.sol";
import "./libraries/SafeMath.sol";

contract ZFERC20 is IZFERC20 {
    using SafeMath for uint256;

    string public constant name = "zkSwap Finance LPs";
    string public constant symbol = "ZF-LP";
    uint8 public constant decimals = 18;
    uint256 public totalSupply;
    mapping(address => uint256) public balanceOf;
    mapping(address => mapping(address => uint256)) public allowance;

    bytes32 public DOMAIN_SEPARATOR;
    // keccak256("Permit(address owner,address spender,uint256 value,uint256 nonce,uint256 deadline)");
    bytes32 public constant PERMIT_TYPEHASH = 0x6e71edae12b1b97f4d1f60370fef10105fa2faae0126114a169c64845d6126c9;
    mapping(address => uint256) public nonces;

    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    constructor() public {
        uint256 chainId;
        assembly {
            chainId := chainid()
        }
        DOMAIN_SEPARATOR = keccak256(
            abi.encode(
                keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)"),
                keccak256(bytes(name)),
                keccak256(bytes("1")),
                chainId,
                address(this)
            )
        );
    }

    function _mint(address to, uint256 value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint256 value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(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] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

    function approve(address spender, uint256 value) external returns (bool) {
        _approve(msg.sender, spender, value);
        return true;
    }

    function transfer(address to, uint256 value) external returns (bool) {
        _transfer(msg.sender, to, value);
        return true;
    }

    function transferFrom(address from, address to, uint256 value) external returns (bool) {
        if (allowance[from][msg.sender] != uint256(-1)) {
            allowance[from][msg.sender] = allowance[from][msg.sender].sub(value);
        }
        _transfer(from, to, value);
        return true;
    }

    function permit(address owner, address spender, uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s)
        external
    {
        require(deadline >= block.timestamp, "ZF: 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, "ZF: INVALID_SIGNATURE");
        _approve(owner, spender, value);
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity =0.5.16;

// 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: GPL-3.0
pragma solidity =0.5.16;

// 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);
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external view returns (string memory);

    function symbol() external view returns (string memory);

    function decimals() external view 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);
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0 <0.7.0;

// a library for performing overflow-safe math, courtesy of DappHub (https://github.com/dapphub/ds-math)

library SafeMath {
    function add(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x + y) >= x, "ds-math-add-overflow");
    }

    function sub(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require((z = x - y) <= x, "ds-math-sub-underflow");
    }

    function mul(uint256 x, uint256 y) internal pure returns (uint256 z) {
        require(y == 0 || (z = x * y) / y == x, "ds-math-mul-overflow");
    }
}

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.5.0;

interface IZFERC20 {
    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;
}

{
  "remappings": [
    "forge-std/=vendor/forge-std/src/",
    "@openzeppelin/contracts/=vendor/openzeppelin-contracts-v3.4.2-solc-0.7/contracts/",
    "solmate/src/=vendor/solmate/src/",
    "solidity-bytes-utils/contracts/=vendor/solidity-bytes-utils/contracts/",
    "@uniswap/lib/contracts/=vendor/solidity-lib/contracts/",
    "@zf/=vendor/@zf/",
    "base64-sol/=vendor/base64-sol/",
    "devtools/=vendor/devtools/",
    "ds-test/=vendor/ds-test/src/",
    "layerzero-v2/=vendor/layerzero-v2/",
    "openzeppelin-contracts-upgradeable-v5.2.0/=vendor/openzeppelin-contracts-upgradeable-v5.2.0/contracts/",
    "openzeppelin-contracts-v3.4.2-solc-0.7/=vendor/openzeppelin-contracts-v3.4.2-solc-0.7/contracts/",
    "openzeppelin-contracts-v4.9.3/=vendor/openzeppelin-contracts-v4.9.3/contracts/",
    "openzeppelin-contracts-v5.2.0/=vendor/openzeppelin-contracts-v5.2.0/contracts/",
    "solidity-lib/=vendor/solidity-lib/contracts/",
    "uniswap-v2-core/=vendor/uniswap-v2-core/contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "istanbul"
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"feeTo","type":"address"}],"name":"FeeToSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"feeToSetter","type":"address"}],"name":"FeeToSetterSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token0","type":"address"},{"indexed":true,"internalType":"address","name":"token1","type":"address"},{"indexed":false,"internalType":"address","name":"pair","type":"address"},{"indexed":false,"internalType":"uint256","name":"allPairsLength","type":"uint256"}],"name":"PairCreated","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"pair","type":"address"},{"indexed":false,"internalType":"uint16","name":"protocolFeeOverride","type":"uint16"}],"name":"ProtocolFeeOverrideSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint16","name":"newProtocolFee","type":"uint16"}],"name":"ProtocolFeeSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"pair","type":"address"},{"indexed":false,"internalType":"uint16","name":"swapFeeOverride","type":"uint16"}],"name":"SwapFeeOverrideSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint16","name":"newSwapFee","type":"uint16"}],"name":"SwapFeeSet","type":"event"},{"constant":true,"inputs":[],"name":"INIT_CODE_PAIR_HASH","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allPairs","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"allPairsLength","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"}],"name":"createPair","outputs":[{"internalType":"address","name":"pair","type":"address"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"feeTo","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"feeToSetter","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"}],"name":"getPair","outputs":[{"internalType":"address","name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"protocolFee","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_feeTo","type":"address"}],"name":"setFeeTo","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_feeToSetter","type":"address"}],"name":"setFeeToSetter","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint16","name":"_newFee","type":"uint16"}],"name":"setProtocolFee","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_pair","type":"address"},{"internalType":"uint16","name":"_protocolFeeOverride","type":"uint16"}],"name":"setProtocolFeeOverride","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"uint16","name":"_newFee","type":"uint16"}],"name":"setSwapFee","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"internalType":"address","name":"_pair","type":"address"},{"internalType":"uint16","name":"_swapFeeOverride","type":"uint16"}],"name":"setSwapFeeOverride","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"swapFee","outputs":[{"internalType":"uint16","name":"","type":"uint16"}],"payable":false,"stateMutability":"view","type":"function"}]

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0000000000000000000000004bc9b68c77a9cd6071a21c6d9d4ae7f2ee921960

-----Decoded View---------------
Arg [0] : _feeToSetter (address): 0x4BC9b68c77A9CD6071A21c6d9d4AE7f2eE921960

-----Encoded View---------------
1 Constructor Arguments found :
Arg [0] : 0000000000000000000000004bc9b68c77a9cd6071a21c6d9d4ae7f2ee921960