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• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address to, uint256 ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address from, a ...
• interface IUniswapV2Pair
•    - function name()
•    - function symbol()
•    - function decimals()
•    - function totalSupply()
•    - function balanceOf(address owner)
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transfer(address to, uint va ...
•    - function transferFrom(address from, a ...
•    - function DOMAIN_SEPARATOR()
•    - function PERMIT_TYPEHASH()
•    - function nonces(address owner)
•    - function permit(address owner, addres ...
•    - function MINIMUM_LIQUIDITY()
•    - function factory()
•    - function token0()
•    - function token1()
•    - function getReserves()
•    - function price0CumulativeLast()
•    - function price1CumulativeLast()
•    - function kLast()
•    - function mint(address to)
•    - function burn(address to)
•    - function swap(uint amount0Out, uint a ...
•    - function skim(address to)
•    - function sync()
•    - function initialize(address, address)
•  contract DirectSwapper *
•    - function swap(address pairAddress, ad ...
•    - function getAmountOut(uint amountIn, ...
•    - function multiSwap(address[] memory p ...
• interface IWETH is IERC20
•    - function deposit()
•    - function withdraw(uint wad)

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/**
 *Submitted for verification at polygonscan.com on 2023-08-23
*/

// File: @openzeppelin/contracts/token/ERC20/IERC20.sol


// OpenZeppelin Contracts (last updated v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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);

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

// File: @uniswap/v2-core/contracts/interfaces/IUniswapV2Pair.sol

pragma solidity >=0.5.0;

interface IUniswapV2Pair {
    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 price0CumulativeLast() external view returns (uint);
    function price1CumulativeLast() external view returns (uint);
    function kLast() external view returns (uint);

    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;
}

// File: contracts/1_Storage.sol


pragma solidity ^0.8.4;



/**
 * @title DirectSwapper
 * @notice This contract performs direct swaps across multiple Uniswap pairs.
 * @dev It optimizes gas by sending the swapped output directly to the next pair in a sequence.
 */
contract DirectSwapper {

    /**
     * @notice Performs a swap on a Uniswap pair.
     * @dev Assumes that token0 has already reached the pair address.
     * @param pairAddress Address of the Uniswap pair.
     * @param token0 Address of the input token.
     * @param token1 Address of the output token.
     * @param amountIn Amount of input tokens to swap.
     * @param recipient Address to receive the output tokens.
     * @return Amount of output tokens received.
     */
    function swap(address pairAddress, address token0, address token1, uint amountIn, address recipient) internal returns (uint) {
        IUniswapV2Pair pair = IUniswapV2Pair(pairAddress);
        
        // Determine order of tokens in pair (lowest address first)
        (address token0Pair, address token1Pair) = token0 < token1 ? (token0, token1) : (token1, token0);
        (uint reserve0, uint reserve1,) = pair.getReserves();
        (uint reserveIn, uint reserveOut) = token0 != token0Pair ? (reserve1, reserve0) : (reserve0, reserve1);

        uint amountOut = getAmountOut(amountIn, reserveIn, reserveOut);
        (uint amount0Out, uint amount1Out) = token0 == token0Pair ? (uint(0), amountOut) : (amountOut, uint(0));
        
        // Execute the swap
        pair.swap(amount0Out, amount1Out, recipient, new bytes(0));
        
        return amountOut;
    }

    /**
     * @notice Calculates the expected output amount for a given input amount and reserves.
     * @dev Uses the formula from the Uniswap whitepaper.
     * @param amountIn Input amount.
     * @param reserveIn Reserve of the input token.
     * @param reserveOut Reserve of the output token.
     * @return Expected output amount.
     */
    function getAmountOut(uint amountIn, uint reserveIn, uint reserveOut) internal pure returns (uint) {
        require(amountIn > 0, "UniswapV2Library: INSUFFICIENT_INPUT_AMOUNT");
        require(reserveIn > 0 && reserveOut > 0, "UniswapV2Library: INSUFFICIENT_LIQUIDITY");
        uint amountInWithFee = amountIn * 997;
        uint numerator = amountInWithFee * reserveOut;
        uint denominator = reserveIn * 1000 + amountInWithFee;
        return numerator / denominator;
    }

    /**
     * @notice Executes a sequence of swaps across multiple Uniswap pairs.
     * @dev Optimized for gas by sending output directly to the next pair in the sequence.
     * @param pairArray Array of Uniswap pair addresses.
     * @param tokenArray Array of token addresses.
     * @param amountIn Initial amount of input token.
     * @param minimumAmountOut Minimum acceptable amount of the final output token.
     * @param isNative Indicates if the input or output is native ETH. 1 for input, 2 for output, 0 for none.
     */
    function multiSwap(address[] memory pairArray, address[] memory tokenArray, uint amountIn, uint minimumAmountOut, uint8 isNative) public payable {
        address tokenIn = tokenArray[0];
        uint currentAmount = amountIn;

        // Handle native ETH deposits
        if (isNative == 1) {
            address WETH = pairArray[0];
            IWETH(WETH).deposit{value: amountIn}();
            IERC20(tokenIn).transfer(pairArray[0], amountIn);
        } else {
            IERC20(tokenIn).transferFrom(msg.sender, pairArray[0], amountIn);
        }

        for (uint i = 0; i < pairArray.length; i++) {
            address receiver;
            if (i != pairArray.length - 1) {
                receiver = pairArray[i+1];
            } else {
                if (isNative == 2) {
                    receiver = address(this);
                } else {
                    receiver = msg.sender;
                }
            }
            address token0 = tokenArray[i];
            address token1 = tokenArray[i + 1];
            currentAmount = swap(pairArray[i], token0, token1, currentAmount, receiver);
            tokenIn = token1;
        }

        require(currentAmount >= minimumAmountOut, "DirectV2: Insufficient final amount due to slippage");

        // Convert WETH to native ETH if needed
        if (isNative == 2) {
            address WETH = pairArray[pairArray.length - 1];
            IWETH(WETH).withdraw(currentAmount);
            payable(msg.sender).transfer(currentAmount);
        }
    }
}

/**
 * @title IWETH Interface
 * @dev Interface for Wrapped Ether (WETH) contract.
 */
interface IWETH is IERC20 {
    function deposit() external payable;
    function withdraw(uint wad) external;
}

/*
Inputs:
con: 0x9615FB99FE2E394d753552De419593870866eA27
["0x60e70705b52a4A5bDc1d8614426bA5016a68aB38","0xb5846453B67d0B4b4Ce655930Cf6E4129F4416D7"]
["0xB5C064F955D8e7F38fE0460C556a72987494eE17","0x7ceB23fD6bC0adD59E62ac25578270cFf1b9f619","0x0b3F868E0BE5597D5DB7fEB59E1CADBb0fdDa50a"]
10000000000000000
0
0
*/

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[{"inputs":[{"internalType":"address[]","name":"pairArray","type":"address[]"},{"internalType":"address[]","name":"tokenArray","type":"address[]"},{"internalType":"uint256","name":"amountIn","type":"uint256"},{"internalType":"uint256","name":"minimumAmountOut","type":"uint256"},{"internalType":"uint8","name":"isNative","type":"uint8"}],"name":"multiSwap","outputs":[],"stateMutability":"payable","type":"function"}]

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