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pragma solidity =0.5.16;

import './interfaces/IBrownFiV1Pair.sol';
import './BrownFiV1ERC20.sol';
import './libraries/Math.sol';
import './libraries/UQ112x112.sol';
import './interfaces/IERC20.sol';
import './interfaces/IBrownFiV1Factory.sol';
import './interfaces/IBrownFiV1Callee.sol';
import '@uniswap/lib/contracts/libraries/FullMath.sol';
import './interfaces/AggregatorV3Interface.sol';

contract BrownFiV1Pair is IBrownFiV1Pair, BrownFiV1ERC20 {
    using SafeMath  for uint;
    using SafeMath  for uint112;
    using UQ112x112 for uint224;

    // avoids stack too deep errors
    struct Balances {
        uint balance0;
        uint balance1;
    }
    struct Inventories {
        uint preInvetory;
        uint postInvetory;
    }

    uint256 internal constant Q128 = 1 << 128;
    uint256 internal constant FEE_DENOMINATOR = 10000;
    uint public constant MINIMUM_LIQUIDITY = 10**3;
    bytes4 private constant SELECTOR = bytes4(keccak256(bytes('transfer(address,uint256)')));

    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

    uint private unlocked = 1;

    // new variables
    uint public kappa = Q128.mul(2); // kappa = 2
    address public priceFeed;
    uint public fee = 0; // fee = 0%
    // quote token index
    uint public qti = 0; // qti = 0
    // shift decimal
    int public decimalShift = 0;

    modifier lock() {
        require(unlocked == 1, 'BrownFiV1: LOCKED');
        unlocked = 0;
        _;
        unlocked = 1;
    }

    function setKappa(uint _kappa) external {
        require(msg.sender == IBrownFiV1Factory(factory).setter(), 'BrownFiV1: FORBIDDEN');
        // kappa limitation [0.001, 2]
        require(_kappa >= Q128 / 1000 && _kappa <= Q128.mul(2), 'BrownFiV1: INVALID_KAPPA');
        kappa = _kappa;
    }

    function setFee(uint _fee) external {
        require(msg.sender == IBrownFiV1Factory(factory).setter(), 'BrownFiV1: FORBIDDEN');
        fee = _fee;
    }

    function setQTI(uint _qti) external {
        require(msg.sender == IBrownFiV1Factory(factory).setter(), 'BrownFiV1: FORBIDDEN');
        qti = _qti;
    }

    function setPriceFeed(address _priceFeed) external {
        require(msg.sender == IBrownFiV1Factory(factory).setter(), 'BrownFiV1: FORBIDDEN');
        priceFeed = _priceFeed;
    }

    function setDecimalShift(int _decimalShift) external {
        require(msg.sender == IBrownFiV1Factory(factory).setter(), 'BrownFiV1: FORBIDDEN');
        decimalShift = _decimalShift;
    }

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

    // Feed oracle price using chainlink interface
    function fetchOraclePrice() public view returns (uint) {
        AggregatorV3Interface _priceFeed = AggregatorV3Interface(priceFeed);
        (
            /* uint80 roundID, */,
            int price,
            /* uint startedAt, */,
            /* uint timeStamp, */,
            /* uint80 answeredInRound */
        ) = _priceFeed.latestRoundData();
        // get decimals from oracle
        uint8 decimals = _priceFeed.decimals();
        // convert price to Q128 base on decimals
        if (qti == 0) {
            if (decimalShift > 0) {
                return FullMath.mulDiv(10**uint(decimals) * 10**uint(decimalShift), Q128, uint(price));
            } else if (decimalShift < 0) {
                return FullMath.mulDiv(10**uint(decimals), Q128, uint(price) * 10**uint(-decimalShift));
            } else {
                return FullMath.mulDiv(10**uint(decimals), Q128, uint(price));
            }
        }
        else {
            if (decimalShift > 0) {
                return FullMath.mulDiv(uint(price), Q128, 10**uint(decimals) * 10**uint(decimalShift));
            } else if (decimalShift < 0) {
                return FullMath.mulDiv(uint(price) * 10**uint(-decimalShift), Q128, 10**uint(decimals));
            } else {
                return FullMath.mulDiv(uint(price), Q128, 10**uint(decimals));
            }
        }
    }

    function _safeTransfer(address token, address to, uint value) private {
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(SELECTOR, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'BrownFiV1: TRANSFER_FAILED');
    }

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to,
        uint swapPrice
    );
    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, 'BrownFiV1: FORBIDDEN'); // sufficient check
        token0 = _token0;
        token1 = _token1;
    }

    // update reserves and, on the first call per block, price accumulators
    function _update(uint balance0, uint balance1, uint112 _reserve0, uint112 _reserve1) private {
        require(balance0 <= uint112(-1) && balance1 <= uint112(-1), 'BrownFiV1: OVERFLOW');
        uint32 blockTimestamp = uint32(block.timestamp % 2**32);
        reserve0 = uint112(balance0);
        reserve1 = uint112(balance1);
        blockTimestampLast = blockTimestamp;
        emit Sync(reserve0, reserve1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function mint(address to) external lock returns (uint liquidity) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        uint balance0 = IERC20(token0).balanceOf(address(this));
        uint balance1 = IERC20(token1).balanceOf(address(this));
        uint amount0 = balance0.sub(_reserve0);
        uint amount1 = balance1.sub(_reserve1);

        uint _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, 'BrownFiV1: INSUFFICIENT_LIQUIDITY_MINTED');
        _mint(to, liquidity);

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Mint(msg.sender, amount0, amount1);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function burn(address to) external lock returns (uint amount0, uint amount1) {
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        address _token0 = token0;                                // gas savings
        address _token1 = token1;                                // gas savings
        uint balance0 = IERC20(_token0).balanceOf(address(this));
        uint balance1 = IERC20(_token1).balanceOf(address(this));
        uint liquidity = balanceOf[address(this)];

        uint _totalSupply = totalSupply; // gas savings, must be defined here since totalSupply can update in _mintFee
        amount0 = liquidity.mul(balance0) / _totalSupply; // using balances ensures pro-rata distribution
        amount1 = liquidity.mul(balance1) / _totalSupply; // using balances ensures pro-rata distribution
        require(amount0 > 0 && amount1 > 0, 'BrownFiV1: INSUFFICIENT_LIQUIDITY_BURNED');
        _burn(address(this), liquidity);
        _safeTransfer(_token0, to, amount0);
        _safeTransfer(_token1, to, amount1);
        balance0 = IERC20(_token0).balanceOf(address(this));
        balance1 = IERC20(_token1).balanceOf(address(this));

        _update(balance0, balance1, _reserve0, _reserve1);
        emit Burn(msg.sender, amount0, amount1, to);
    }

    // this low-level function should be called from a contract which performs important safety checks
    function swap(
        uint amount0Out,
        uint amount1Out,
        address to,
        bytes calldata data
    ) external lock {
        require(amount0Out > 0 || amount1Out > 0, 'BrownFiV1: INSUFFICIENT_OUTPUT_AMOUNT');
        (uint112 _reserve0, uint112 _reserve1,) = getReserves(); // gas savings
        require(amount0Out < _reserve0 && amount1Out < _reserve1, 'BrownFiV1: INSUFFICIENT_LIQUIDITY');

        Balances memory b;
        { // scope for _token{0,1}, avoids stack too deep errors
        address _token0 = token0;
        address _token1 = token1;
        require(to != _token0 && to != _token1, 'BrownFiV1: 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) IBrownFiV1Callee(to).brownFiV1Call(msg.sender, amount0Out, amount1Out, data);
        b.balance0 = IERC20(_token0).balanceOf(address(this));
        b.balance1 = IERC20(_token1).balanceOf(address(this));
        }
        uint amount0In = b.balance0 > _reserve0 - amount0Out ? b.balance0 - (_reserve0 - amount0Out) : 0;
        uint amount1In = b.balance1 > _reserve1 - amount1Out ? b.balance1 - (_reserve1 - amount1Out) : 0;
        require(amount0In > 0 || amount1In > 0, 'BrownFiV1: INSUFFICIENT_INPUT_AMOUNT');

        // verify post-trade invetory is greater or equal to pre-trade invetory
        uint swapPrice = checkInvetory(amount0Out, amount1Out, b.balance0, b.balance1, _reserve0, _reserve1);
        emit Swap(msg.sender, amount0In, amount1In, amount0Out, amount1Out, to, swapPrice);
    }

    function checkInvetory(
        uint amount0Out,
        uint amount1Out,
        uint balance0,
        uint balance1,
        uint112 _reserve0,
        uint112 _reserve1
    ) private returns (uint) {
        uint oPrice = fetchOraclePrice();
        Inventories memory i;
        uint amount0OutWithoutFee;
        uint amount1OutWithoutFee;
        if (amount0Out > 0) amount0OutWithoutFee = FullMath.mulDiv(amount0Out, FEE_DENOMINATOR, FEE_DENOMINATOR - fee);
        if (amount1Out > 0) amount1OutWithoutFee = FullMath.mulDiv(amount1Out, FEE_DENOMINATOR, FEE_DENOMINATOR - fee);
        if (amount0OutWithoutFee > 0) {
            // calculate pre-trade invetory x*P + y + (P*K*dx*dx) / 2*(x - dx)
            // (P*K*dx*dx)
            uint denominator = FullMath.mulDiv(oPrice, amount0OutWithoutFee, Q128)
                .mul(FullMath.mulDiv(kappa, amount0OutWithoutFee, Q128));
            // 2*(x - dx)
            uint numerator = (_reserve0 - amount0OutWithoutFee).mul(2);
            i.preInvetory = FullMath.mulDiv(oPrice, _reserve0, Q128).add(_reserve1).add(denominator / numerator);
            _update(balance0, balance1, _reserve0, _reserve1);
            // calculate post-trade invetory (x - dx)*P + (y + dy)
            i.postInvetory = FullMath.mulDiv(oPrice, _reserve0 - amount0OutWithoutFee, Q128).add(reserve1);
        }
        if (amount1OutWithoutFee > 0) {
            // calculate pre-trade invetory x*P + y + (K*dx*dx) / 2*(y - dy)
            // (K*dy*dy)
            uint denominator = (FullMath.mulDiv(kappa, amount1OutWithoutFee, Q128)).mul(amount1OutWithoutFee);
            // 2*(y - dy)
            uint numerator = (_reserve1 - amount1OutWithoutFee).mul(2);
            i.preInvetory = FullMath.mulDiv(oPrice, _reserve0, Q128).add(_reserve1).add(denominator / numerator);
            _update(balance0, balance1, _reserve0, _reserve1);
            // calculate post-trade invetory (x + dx)*P + (y - dy)
            i.postInvetory = FullMath.mulDiv(oPrice, reserve0, Q128).add(_reserve1 - amount1OutWithoutFee);
        }
        // verification
        require(i.postInvetory >= i.preInvetory, 'BrownFiV1: INVALID_TRADE');
        return oPrice;
    }

    // force balances to match reserves
    function skim(address to) external lock {
        address _token0 = token0; // gas savings
        address _token1 = token1; // gas savings
        _safeTransfer(_token0, to, IERC20(_token0).balanceOf(address(this)).sub(reserve0));
        _safeTransfer(_token1, to, IERC20(_token1).balanceOf(address(this)).sub(reserve1));
    }

    // force reserves to match balances
    function sync() external lock {
        _update(IERC20(token0).balanceOf(address(this)), IERC20(token1).balanceOf(address(this)), reserve0, reserve1);
    }
}

// SPDX-License-Identifier: CC-BY-4.0
pragma solidity >=0.4.0;

// taken from https://medium.com/coinmonks/math-in-solidity-part-3-percents-and-proportions-4db014e080b1
// license is CC-BY-4.0
library FullMath {
    function fullMul(uint256 x, uint256 y) internal pure returns (uint256 l, uint256 h) {
        uint256 mm = mulmod(x, y, uint256(-1));
        l = x * y;
        h = mm - l;
        if (mm < l) h -= 1;
    }

    function fullDiv(
        uint256 l,
        uint256 h,
        uint256 d
    ) private pure returns (uint256) {
        uint256 pow2 = d & -d;
        d /= pow2;
        l /= pow2;
        l += h * ((-pow2) / pow2 + 1);
        uint256 r = 1;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        r *= 2 - d * r;
        return l * r;
    }

    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 d
    ) internal pure returns (uint256) {
        (uint256 l, uint256 h) = fullMul(x, y);

        uint256 mm = mulmod(x, y, d);
        if (mm > l) h -= 1;
        l -= mm;

        if (h == 0) return l / d;

        require(h < d, 'FullMath: FULLDIV_OVERFLOW');
        return fullDiv(l, h, d);
    }
}

pragma solidity =0.5.16;

import './interfaces/IBrownFiV1ERC20.sol';
import './libraries/SafeMath.sol';

contract BrownFiV1ERC20 is IBrownFiV1ERC20 {
    using SafeMath for uint;

    string public constant name = 'BrownFI V1';
    string public constant symbol = 'BRF-V1';
    uint8 public constant decimals = 18;
    uint  public totalSupply;
    mapping(address => uint) public balanceOf;
    mapping(address => mapping(address => uint)) 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 => uint) public nonces;

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

    constructor() public {
        uint 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, uint value) internal {
        totalSupply = totalSupply.add(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(address(0), to, value);
    }

    function _burn(address from, uint value) internal {
        balanceOf[from] = balanceOf[from].sub(value);
        totalSupply = totalSupply.sub(value);
        emit Transfer(from, address(0), value);
    }

    function _approve(address owner, address spender, uint value) private {
        allowance[owner][spender] = value;
        emit Approval(owner, spender, value);
    }

    function _transfer(address from, address to, uint value) private {
        balanceOf[from] = balanceOf[from].sub(value);
        balanceOf[to] = balanceOf[to].add(value);
        emit Transfer(from, to, value);
    }

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

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

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

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external {
        require(deadline >= block.timestamp, 'BrownFiV1: 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, 'BrownFiV1: INVALID_SIGNATURE');
        _approve(owner, spender, value);
    }
}

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

interface AggregatorV3Interface {
    function decimals() external view returns (uint8);

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

    function version() external view returns (uint256);

    function getRoundData(
        uint80 _roundId
    )
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);

    function latestRoundData()
        external
        view
        returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
}

pragma solidity >=0.5.0;

interface IBrownFiV1Callee {
    function brownFiV1Call(address sender, uint amount0, uint amount1, bytes calldata data) external;
}

pragma solidity >=0.5.0;

interface IBrownFiV1ERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint 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 (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;
}

pragma solidity >=0.5.0;

interface IBrownFiV1Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

    function setter() external view returns (address);

    function getPair(address tokenA, address tokenB) external view returns (address pair);
    function allPairs(uint) external view returns (address pair);
    function allPairsLength() external view returns (uint);

    function createPair(address tokenA, address tokenB) external returns (address pair);

    function setSetter(address) external;
}

pragma solidity >=0.5.0;

interface IBrownFiV1Pair {

    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint 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 (uint);

    function permit(address owner, address spender, uint value, uint deadline, uint8 v, bytes32 r, bytes32 s) external;

    event Mint(address indexed sender, uint amount0, uint amount1);
    event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
    event Swap(
        address indexed sender,
        uint amount0In,
        uint amount1In,
        uint amount0Out,
        uint amount1Out,
        address indexed to
    );
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint);
    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 mint(address to) external returns (uint liquidity);
    function burn(address to) external returns (uint amount0, uint amount1);
    function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
    function skim(address to) external;
    function sync() external;

    function initialize(address, address) external;

    function fetchOraclePrice() external view returns (uint);
    function kappa() external view returns (uint);
    function fee() external view returns (uint);
    function priceFeed() external view returns (address);
    function qti() external view returns (uint);
    function decimalShift() external view returns (int);
}

pragma solidity >=0.5.0;

interface IERC20 {
    event Approval(address indexed owner, address indexed spender, uint value);
    event Transfer(address indexed from, address indexed to, uint 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 (uint);
    function balanceOf(address owner) external view returns (uint);
    function allowance(address owner, address spender) external view returns (uint);

    function approve(address spender, uint value) external returns (bool);
    function transfer(address to, uint value) external returns (bool);
    function transferFrom(address from, address to, uint value) external returns (bool);
}

pragma solidity =0.5.16;

// a library for performing various math operations

library Math {
    function min(uint x, uint y) internal pure returns (uint z) {
        z = x < y ? x : y;
    }

    // babylonian method (https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method)
    function sqrt(uint y) internal pure returns (uint z) {
        if (y > 3) {
            z = y;
            uint x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
    }
}

pragma solidity =0.5.16;

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

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

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

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

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);
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

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