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// File: openzeppelin-solidity/contracts/token/ERC20/IERC20.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

// File: original_contracts/lib/weth/IWETH.sol

pragma solidity 0.7.5;



abstract contract IWETH is IERC20 {
    function deposit() external virtual payable;
    function withdraw(uint256 amount) external virtual;
}

// File: original_contracts/lib/uniswapv2/IUniswapV2Pair.sol

pragma solidity 0.7.5;

interface IUniswapV2Pair {

    function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
    function swap(
        uint amount0Out,
        uint amount1Out,
        address to,
        bytes calldata data
    )
        external;
}

// File: openzeppelin-solidity/contracts/math/SafeMath.sol



pragma solidity >=0.6.0 <0.8.0;

/**
 * @dev Wrappers over Solidity's arithmetic operations with added overflow
 * checks.
 *
 * Arithmetic operations in Solidity wrap on overflow. This can easily result
 * in bugs, because programmers usually assume that an overflow raises an
 * error, which is the standard behavior in high level programming languages.
 * `SafeMath` restores this intuition by reverting the transaction when an
 * operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");

        return c;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;

        return c;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
        // benefit is lost if 'b' is also tested.
        // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
        if (a == 0) {
            return 0;
        }

        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");

        return c;
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    /**
     * @dev Returns the integer division of two unsigned integers. Reverts with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        // assert(a == b * c + a % b); // There is no case in which this doesn't hold

        return c;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return mod(a, b, "SafeMath: modulo by zero");
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * Reverts with custom message when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        require(b != 0, errorMessage);
        return a % b;
    }
}

// File: original_contracts/lib/uniswapv2/NewUniswapV2Lib.sol

pragma solidity 0.7.5;




library NewUniswapV2Lib {
    using SafeMath for uint256;

    function getReservesByPair(
        address pair,
        bool direction
    )
        internal
        view
        returns (uint256 reserveIn, uint256 reserveOut)
    {
        (uint256 reserve0, uint256 reserve1,) = IUniswapV2Pair(pair).getReserves();
        (reserveIn, reserveOut) = direction ? (reserve0, reserve1) : (reserve1, reserve0);
    }

    function getAmountOut(
        uint256 amountIn,
        address pair,
        bool direction,
        uint256 fee
    )
        internal
        view
        returns (uint256 amountOut)
    {
        require(amountIn > 0, "UniswapV2Lib: INSUFFICIENT_INPUT_AMOUNT");
        (uint256 reserveIn, uint256 reserveOut) = getReservesByPair(pair, direction);
        uint256 amountInWithFee = amountIn.mul(fee);
        uint256 numerator = amountInWithFee.mul(reserveOut);
        uint256 denominator = reserveIn.mul(10000).add(amountInWithFee);
        amountOut = uint256(numerator / denominator);
    }

    function getAmountIn(
        uint256 amountOut,
        address pair,
        bool direction,
        uint256 fee
    )
        internal
        view
        returns (uint256 amountIn)
    {
        require(amountOut > 0, "UniswapV2Lib: INSUFFICIENT_OUTPUT_AMOUNT");
        (uint256 reserveIn, uint256 reserveOut) = getReservesByPair(pair, direction);
        require(reserveOut > amountOut, "UniswapV2Lib: reserveOut should be greater than amountOut");
        uint256 numerator = reserveIn.mul(amountOut).mul(10000);
        uint256 denominator = reserveOut.sub(amountOut).mul(fee);
        amountIn = (numerator / denominator).add(1);
    }
}

// File: @uniswap/lib/contracts/libraries/TransferHelper.sol

pragma solidity >=0.6.0;

// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: APPROVE_FAILED');
    }

    function safeTransfer(address token, address to, uint value) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FAILED');
    }

    function safeTransferFrom(address token, address from, address to, uint value) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), 'TransferHelper: TRANSFER_FROM_FAILED');
    }

    function safeTransferETH(address to, uint value) internal {
        (bool success,) = to.call{value:value}(new bytes(0));
        require(success, 'TransferHelper: ETH_TRANSFER_FAILED');
    }
}

// File: original_contracts/lib/uniswapv2/NewUniswapV2ExchangeRouter.sol

pragma solidity 0.7.5;




contract NewUniswapV2ExchangeRouter {
    using SafeMath for uint256;

    address constant ETH_IDENTIFIER = address(
        0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE
    );
    // Pool bits are 255-161: fee, 160: direction flag, 159-0: address
    uint256 constant FEE_OFFSET = 161;
    uint256 constant DIRECTION_FLAG =
        0x0000000000000000000000010000000000000000000000000000000000000000;

    receive() external payable {
    }

    function swap(
        address tokenIn,
        uint256 amountIn,
        uint256 amountOutMin,
        address weth,
        uint256[] calldata pools
    )
        external
        payable
        returns (uint256 tokensBought)
    {
        return _swap(
            tokenIn,
            amountIn,
            amountOutMin,
            weth,
            pools
        );
    }

    function buy(
        address tokenIn,
        uint256 amountInMax,
        uint256 amountOut,
        address weth,
        uint256[] memory pools
    )
        external
        payable
        returns (uint256 tokensSold)
    {
        return _buy(
            tokenIn,
            amountInMax,
            amountOut,
            weth,
            pools
        );
    }

    function _swap(
        address tokenIn,
        uint256 amountIn,
        uint256 amountOutMin,
        address weth,
        uint256[] memory pools
    )
        private
        returns (uint256 tokensBought)
    {
        uint256 pairs = pools.length;

        require(pairs != 0, "At least one pool required");

        bool tokensBoughtEth;

        if (tokenIn == ETH_IDENTIFIER) {
            require(amountIn == msg.value, "Incorrect amount of ETH sent");
            IWETH(weth).deposit{value: msg.value}();
            require(IWETH(weth).transfer(address(pools[0]), msg.value));
        } else {
            TransferHelper.safeTransferFrom(
                tokenIn, msg.sender, address(pools[0]), amountIn
            );
            tokensBoughtEth = weth != address(0);
        }

        tokensBought = amountIn;

        for (uint256 i = 0; i < pairs; ++i) {
            uint256 p = pools[i];
            address pool = address(p);
            bool direction = p & DIRECTION_FLAG == 0;

            tokensBought = NewUniswapV2Lib.getAmountOut(
                tokensBought, pool, direction, p >> FEE_OFFSET
            );
            (uint256 amount0Out, uint256 amount1Out) = direction
                ? (uint256(0), tokensBought) : (tokensBought, uint256(0));
            IUniswapV2Pair(pool).swap(
                amount0Out,
                amount1Out,
                i + 1 == pairs
                    ? (tokensBoughtEth ? address(this) : msg.sender)
                    : address(pools[i + 1]),
                ""
            );
        }

        if (tokensBoughtEth) {
            IWETH(weth).withdraw(tokensBought);
            TransferHelper.safeTransferETH(msg.sender, tokensBought);
        }

        require(tokensBought >= amountOutMin, "UniswapV2Router: INSUFFICIENT_OUTPUT_AMOUNT");
    }

    function _buy(
        address tokenIn,
        uint256 amountInMax,
        uint256 amountOut,
        address weth,
        uint256[] memory pools
    )
        private
        returns (uint256 tokensSold)
    {
        uint256 pairs = pools.length;

        require(pairs != 0, "At least one pool required");

        uint256[] memory amounts = new uint256[](pairs + 1);

        amounts[pairs] = amountOut;

        for (uint256 i = pairs; i != 0; --i) {
            uint256 p = pools[i - 1];
            amounts[i - 1] = NewUniswapV2Lib.getAmountIn(
                amounts[i],
                address(p),
                p & DIRECTION_FLAG == 0,
                p >> FEE_OFFSET
            );
        }

        tokensSold = amounts[0];
        require(tokensSold <= amountInMax, "UniswapV2Router: INSUFFICIENT_INPUT_AMOUNT");
        bool tokensBoughtEth;

        if (tokenIn == ETH_IDENTIFIER) {
            TransferHelper.safeTransferETH(
                msg.sender, msg.value.sub(tokensSold)
            );
            IWETH(weth).deposit{value: tokensSold}();
            require(IWETH(weth).transfer(address(pools[0]), tokensSold));
        } else {
            TransferHelper.safeTransferFrom(
                tokenIn, msg.sender, address(pools[0]), tokensSold
            );
            tokensBoughtEth = weth != address(0);
        }

        for (uint256 i = 0; i < pairs; ++i) {
            uint256 p = pools[i];
            (uint256 amount0Out, uint256 amount1Out) = p & DIRECTION_FLAG == 0
                ? (uint256(0), amounts[i + 1]) : (amounts[i + 1], uint256(0));
            IUniswapV2Pair(address(p)).swap(
                amount0Out,
                amount1Out,
                i + 1 == pairs
                    ? (tokensBoughtEth ? address(this) : msg.sender)
                    : address(pools[i + 1]),
                ""
            );
        }

        if (tokensBoughtEth) {
            IWETH(weth).withdraw(amountOut);
            TransferHelper.safeTransferETH(msg.sender, amountOut);
        }
    }
}

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

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[{"inputs":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"uint256","name":"amountInMax","type":"uint256"},{"internalType":"uint256","name":"amountOut","type":"uint256"},{"internalType":"address","name":"weth","type":"address"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"}],"name":"buy","outputs":[{"internalType":"uint256","name":"tokensSold","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address","name":"tokenIn","type":"address"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"amountOutMin","type":"uint256"},{"internalType":"address","name":"weth","type":"address"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"}],"name":"swap","outputs":[{"internalType":"uint256","name":"tokensBought","type":"uint256"}],"stateMutability":"payable","type":"function"},{"stateMutability":"payable","type":"receive"}]

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