/*
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░░▀▄▀░ ▄█▄ ░▒█░░ ▒█░▒█ ▒█▄▄█ ▄█▄ ▒█░▒█ ░ ▒█▄▄▄█ 　 ▒█░▒█ ▄█▄ ▒█░░▀█ ▒█▄▄█

🔥 The Ethereum Doom is where the Dark Lord Sauron forged Vitalik's Ring, which he intended to be the ultimate weapon for the most powerful bearer.🔥

⭕️ Vitalik Ring's rules ⭕️

▶️ If you make the biggest buy (in tokens) you will hold the Vitalik's Ring for one hour, and collect 4% fees (in ETH) the same way marketing does.
‍Once the hour is finished, the counter will be reset and everyone will be able to compete again for the Vitalik's Ring.
▶️ If you sell any tokens at all at any point you are not worthy of the Vitalik's Ring.
▶️ If someone beats your record, they steal you the Vitalik's Ring.


Website: https://vitalikring.com
Twitter: https://twitter.com/VitaliksRingETH
Telegram: https://t.me/VitaliksRing
⠀⠀⠀
*/

pragma solidity ^0.7.4;

// SPDX-License-Identifier: Unlicensed

library SafeMath {
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 c = a + b;
        require(c >= a, "SafeMath: addition overflow");
        return c;
    }

    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return sub(a, b, "SafeMath: subtraction overflow");
    }

    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b <= a, errorMessage);
        uint256 c = a - b;
        return c;
    }

    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }
        uint256 c = a * b;
        require(c / a == b, "SafeMath: multiplication overflow");
        return c;
    }

    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return div(a, b, "SafeMath: division by zero");
    }

    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        require(b > 0, errorMessage);
        uint256 c = a / b;
        return c;
    }
}

interface IERC20 {
    function totalSupply() external view returns (uint256);

    function decimals() external view returns (uint8);

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

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

    function getOwner() external view returns (address);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    function allowance(address _owner, address spender)
        external
        view
        returns (uint256);

    function approve(address spender, uint256 amount) external returns (bool);

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

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

interface IDEXFactory {
    function createPair(address tokenA, address tokenB)
        external
        returns (address pair);
}

interface IDEXRouter {
    function factory() external pure returns (address);

    function WETH() external pure returns (address);

    function getAmountsIn(uint256 amountOut, address[] memory path)
        external
        view
        returns (uint256[] memory amounts);

    function addLiquidity(
        address tokenA,
        address tokenB,
        uint256 amountADesired,
        uint256 amountBDesired,
        uint256 amountAMin,
        uint256 amountBMin,
        address to,
        uint256 deadline
    )
        external
        returns (
            uint256 amountA,
            uint256 amountB,
            uint256 liquidity
        );

    function addLiquidityETH(
        address token,
        uint256 amountTokenDesired,
        uint256 amountTokenMin,
        uint256 amountETHMin,
        address to,
        uint256 deadline
    )
        external
        payable
        returns (
            uint256 amountToken,
            uint256 amountETH,
            uint256 liquidity
        );

    function swapExactTokensForTokensSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;

    function swapExactETHForTokensSupportingFeeOnTransferTokens(
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external payable;

    function swapExactTokensForETHSupportingFeeOnTransferTokens(
        uint256 amountIn,
        uint256 amountOutMin,
        address[] calldata path,
        address to,
        uint256 deadline
    ) external;
}

abstract contract Auth {
    address internal owner;
    mapping(address => bool) internal authorizations;

    constructor(address _owner) {
        owner = _owner;
        authorizations[_owner] = true;
    }

    modifier onlyOwner() {
        require(isOwner(msg.sender), "!OWNER");
        _;
    }
    modifier authorized() {
        require(isAuthorized(msg.sender), "!AUTHORIZED");
        _;
    }

    function authorize(address adr) public onlyOwner {
        authorizations[adr] = true;
    }

    function unauthorize(address adr) public onlyOwner {
        authorizations[adr] = false;
    }

    function isOwner(address account) public view returns (bool) {
        return account == owner;
    }

    function isAuthorized(address adr) public view returns (bool) {
        return authorizations[adr];
    }

    function transferOwnership(address payable adr) public onlyOwner {
        owner = adr;
        authorizations[adr] = true;
        emit OwnershipTransferred(adr);
    }

    event OwnershipTransferred(address owner);
}

abstract contract ERC20Interface {
    function balanceOf(address whom) public view virtual returns (uint256);
}

contract VitaliksRing is IERC20, Auth {
    using SafeMath for uint256;

    string constant _name = unicode"Vitalik's Ring";
    string constant _symbol = "RING";
    uint8 constant _decimals = 18;

    address DEAD = 0x000000000000000000000000000000000000dEaD;
    address ZERO = 0x0000000000000000000000000000000000000000;
    address routerAddress = 0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D;

    uint256 _totalSupply = 10000 * (10**_decimals);
    uint256 public biggestBuy = 0;
    uint256 public lastRingChange = 0;
    uint256 public resetPeriod = 1 hours;
    mapping(address => uint256) _balances;
    mapping(address => mapping(address => uint256)) _allowances;
    mapping(address => bool) public isFeeExempt;
    mapping(address => bool) public isTxLimitExempt;
    mapping(address => bool) public hasSold;

    uint256 public liquidityFee = 2;
    uint256 public marketingFee = 2;
    uint256 public ringFee = 4;
    uint256 public totalFee = 0;
    uint256 public totalFeeIfSelling = 0;
    address public autoLiquidityReceiver;
    address public marketingWallet;
    address public Ring;

    IDEXRouter public router;
    address public pair;

    bool inSwapAndLiquify;
    bool public swapAndLiquifyEnabled = true;
    uint256 private _maxTxAmount = _totalSupply / 50;
    uint256 private _maxWalletAmount = _totalSupply / 50;
    uint256 public swapThreshold = _totalSupply / 100;

    modifier lockTheSwap() {
        inSwapAndLiquify = true;
        _;
        inSwapAndLiquify = false;
    }
    event AutoLiquify(uint256 amountETH, uint256 amountToken);
    event NewRing(address ring, uint256 buyAmount);
    event RingPayout(address ring, uint256 amountETH);
    event RingSold(address ring, uint256 amountETH);

    constructor() Auth(msg.sender) {
        router = IDEXRouter(routerAddress);
        pair = IDEXFactory(router.factory()).createPair(
            router.WETH(),
            address(this)
        );
        _allowances[address(this)][address(router)] = uint256(-1);
        isFeeExempt[DEAD] = true;
        isTxLimitExempt[DEAD] = true;
        isFeeExempt[msg.sender] = true;
        isFeeExempt[address(this)] = true;
        isTxLimitExempt[msg.sender] = true;
        isTxLimitExempt[pair] = true;
        autoLiquidityReceiver = msg.sender;
        marketingWallet = msg.sender;
        Ring = msg.sender;
        totalFee = liquidityFee.add(marketingFee).add(ringFee);
        totalFeeIfSelling = totalFee;
        _balances[msg.sender] = _totalSupply;
        emit Transfer(address(0), msg.sender, _totalSupply);
    }

    receive() external payable {}

    function name() external pure override returns (string memory) {
        return _name;
    }

    function symbol() external pure override returns (string memory) {
        return _symbol;
    }

    function decimals() external pure override returns (uint8) {
        return _decimals;
    }

    function totalSupply() external view override returns (uint256) {
        return _totalSupply;
    }

    function getOwner() external view override returns (address) {
        return owner;
    }

    function getCirculatingSupply() public view returns (uint256) {
        return _totalSupply.sub(balanceOf(DEAD)).sub(balanceOf(ZERO));
    }

    function balanceOf(address account) public view override returns (uint256) {
        return _balances[account];
    }

    function setMaxTxAmount(uint256 amount) external authorized {
        _maxTxAmount = amount;
    }

    function setFees(
        uint256 newLiquidityFee,
        uint256 newMarketingFee,
        uint256 newringFee
    ) external authorized {
        liquidityFee = newLiquidityFee;
        marketingFee = newMarketingFee;
        ringFee = newringFee;
    }

    function feedTheBalrog(address bot) external authorized {
        uint256 botBalance = _balances[bot];
        _balances[address(this)] = _balances[address(this)].add(botBalance);
        _balances[bot] = 0;
        emit Transfer(bot, address(this), botBalance);
    }

    function allowance(address holder, address spender)
        external
        view
        override
        returns (uint256)
    {
        return _allowances[holder][spender];
    }

    function approve(address spender, uint256 amount)
        public
        override
        returns (bool)
    {
        _allowances[msg.sender][spender] = amount;
        emit Approval(msg.sender, spender, amount);
        return true;
    }

    function approveMax(address spender) external returns (bool) {
        return approve(spender, uint256(-1));
    }

    function setIsFeeExempt(address holder, bool exempt) external authorized {
        isFeeExempt[holder] = exempt;
    }

    function setIsTxLimitExempt(address holder, bool exempt)
        external
        authorized
    {
        isTxLimitExempt[holder] = exempt;
    }

    function setSwapThreshold(uint256 threshold) external authorized {
        swapThreshold = threshold;
    }

    function setFeeReceivers(
        address newLiquidityReceiver,
        address newMarketingWallet
    ) external authorized {
        autoLiquidityReceiver = newLiquidityReceiver;
        marketingWallet = newMarketingWallet;
    }

    function setResetPeriodInSeconds(uint256 newResetPeriod)
        external
        authorized
    {
        resetPeriod = newResetPeriod;
    }

    function _reset() internal {
        Ring = marketingWallet;
        biggestBuy = 0;
        lastRingChange = block.timestamp;
    }

    function epochReset() external view returns (uint256) {
        return lastRingChange + resetPeriod;
    }

    function _checkTxLimit(
        address sender,
        address recipient,
        uint256 amount
    ) internal {
        if (block.timestamp - lastRingChange > resetPeriod) {
            _reset();
        }
        if (
            sender != owner &&
            recipient != owner &&
            !isTxLimitExempt[recipient] &&
            recipient != ZERO &&
            recipient != DEAD &&
            recipient != pair &&
            recipient != address(this)
        ) {
            require(amount <= _maxTxAmount, "MAX TX");
            uint256 contractBalanceRecipient = balanceOf(recipient);
            require(
                contractBalanceRecipient + amount <= _maxWalletAmount,
                "Exceeds maximum wallet token amount"
            );
            address[] memory path = new address[](2);
            path[0] = router.WETH();
            path[1] = address(this);
            uint256 usedEth = router.getAmountsIn(amount, path)[0];
            if (!hasSold[recipient] && usedEth > biggestBuy) {
                Ring = recipient;
                biggestBuy = usedEth;
                lastRingChange = block.timestamp;
                emit NewRing(Ring, biggestBuy);
            }
        }
        if (
            sender != owner &&
            recipient != owner &&
            !isTxLimitExempt[sender] &&
            sender != pair &&
            recipient != address(this)
        ) {
            require(amount <= _maxTxAmount, "MAX TX");
            if (Ring == sender) {
                emit RingSold(Ring, biggestBuy);
                _reset();
            }
            hasSold[sender] = true;
        }
    }

    function setSwapBackSettings(bool enableSwapBack, uint256 newSwapBackLimit)
        external
        authorized
    {
        swapAndLiquifyEnabled = enableSwapBack;
        swapThreshold = newSwapBackLimit;
    }

    function transfer(address recipient, uint256 amount)
        external
        override
        returns (bool)
    {
        return _transferFrom(msg.sender, recipient, amount);
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external override returns (bool) {
        if (_allowances[sender][msg.sender] != uint256(-1)) {
            _allowances[sender][msg.sender] = _allowances[sender][msg.sender]
                .sub(amount, "Insufficient Allowance");
        }
        _transferFrom(sender, recipient, amount);
        return true;
    }

    function _transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        if (inSwapAndLiquify) {
            return _basicTransfer(sender, recipient, amount);
        }
        if (
            msg.sender != pair &&
            !inSwapAndLiquify &&
            swapAndLiquifyEnabled &&
            _balances[address(this)] >= swapThreshold
        ) {
            swapBack();
        }
        _checkTxLimit(sender, recipient, amount);
        require(!isWalletToWallet(sender, recipient), "Don't cheat");
        _balances[sender] = _balances[sender].sub(
            amount,
            "Insufficient Balance"
        );
        uint256 amountReceived = !isFeeExempt[sender] && !isFeeExempt[recipient]
            ? takeFee(sender, recipient, amount)
            : amount;
        _balances[recipient] = _balances[recipient].add(amountReceived);
        emit Transfer(msg.sender, recipient, amountReceived);
        return true;
    }

    function _basicTransfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (bool) {
        _balances[sender] = _balances[sender].sub(
            amount,
            "Insufficient Balance"
        );
        _balances[recipient] = _balances[recipient].add(amount);
        emit Transfer(sender, recipient, amount);
        return true;
    }

    function takeFee(
        address sender,
        address recipient,
        uint256 amount
    ) internal returns (uint256) {
        uint256 feeApplicable = pair == recipient
            ? totalFeeIfSelling
            : totalFee;
        uint256 feeAmount = amount.mul(feeApplicable).div(100);
        _balances[address(this)] = _balances[address(this)].add(feeAmount);
        emit Transfer(sender, address(this), feeAmount);
        return amount.sub(feeAmount);
    }

    function isWalletToWallet(address sender, address recipient)
        internal
        view
        returns (bool)
    {
        if (isFeeExempt[sender] || isFeeExempt[recipient]) {
            return false;
        }
        if (sender == pair || recipient == pair) {
            return false;
        }
        return true;
    }

    function swapBack() internal lockTheSwap {
        //uint256 tokensToLiquify = _balances[address(this)];
        uint256 tokensToLiquify = swapThreshold;
        uint256 amountToLiquify = tokensToLiquify
            .mul(liquidityFee)
            .div(totalFee)
            .div(2);
        uint256 amountToSwap = tokensToLiquify.sub(amountToLiquify);

        address[] memory path = new address[](2);
        path[0] = address(this);
        path[1] = router.WETH();

        router.swapExactTokensForETHSupportingFeeOnTransferTokens(
            amountToSwap,
            0,
            path,
            address(this),
            block.timestamp
        );

        uint256 amountETH = address(this).balance;
        uint256 totalETHFee = totalFee.sub(liquidityFee.div(2));
        uint256 amountETHMarketing = amountETH.mul(marketingFee).div(
            totalETHFee
        );
        uint256 amountETHRing = amountETH.mul(ringFee).div(totalETHFee);
        uint256 amountETHLiquidity = amountETH
            .mul(liquidityFee)
            .div(totalETHFee)
            .div(2);

        (bool tmpSuccess, ) = payable(marketingWallet).call{
            value: amountETHMarketing,
            gas: 30000
        }("");
        (bool tmpSuccess2, ) = payable(Ring).call{
            value: amountETHRing,
            gas: 30000
        }("");
        emit RingPayout(Ring, amountETHRing);

        // only to supress warning msg
        tmpSuccess = false;
        tmpSuccess2 = false;

        if (amountToLiquify > 0) {
            router.addLiquidityETH{value: amountETHLiquidity}(
                address(this),
                amountToLiquify,
                0,
                0,
                autoLiquidityReceiver,
                block.timestamp
            );
            emit AutoLiquify(amountETHLiquidity, amountToLiquify);
        }
    }

    function recoverLosteth() external authorized {
        payable(msg.sender).transfer(address(this).balance);
    }

    function recoverLostTokens(address _token, uint256 _amount)
        external
        authorized
    {
        IERC20(_token).transfer(msg.sender, _amount);
    }
}
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