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Outline

• interface Callable
•    - function tokenCallback(address _from, ...
• interface KRILL
•    - function balanceOf(address)
•    - function transfer(address, uint256)
•    - function transferFrom(address, addres ...
•  contract cKRILL *
•    - function disburse(uint256 _amount)
•    - function buy(uint256 _amount)
•    - function buyFor(uint256 _amount, addr ...
•    - function tokenCallback(address _from, ...
•    - function sell(uint256 _tokens)
•    - function withdraw()
•    - function reinvest()
•    - function transfer(address _to, uint25 ...
•    - function approve(address _spender, ui ...
•    - function transferFrom(address _from, ...
•    - function transferAndCall(address _to, ...
•    - function totalSupply()
•    - function currentPrices()
•    - function balanceOf(address _user)
•    - function dividendsOf(address _user)
•    - function allInfoFor(address _user)
•    - function allowance(address _user, add ...
•    - function calculateResult(uint256 _amo ...
•    - function _transfer(address _from, add ...
•    - function _buy(uint256 _amount, addres ...
•    - function _sell(uint256 _tokens)
•    - function _sqrt(uint256 _n)

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/**
 *Submitted for verification at Etherscan.io on 2021-11-30
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

interface Callable {
	function tokenCallback(address _from, uint256 _tokens, bytes calldata _data) external returns (bool);
}

interface KRILL {
	function balanceOf(address) external view returns (uint256);
	function transfer(address, uint256) external returns (bool);
	function transferFrom(address, address, uint256) external returns (bool);
}

contract cKRILL {

	uint256 constant private FLOAT_SCALAR = 2**64;
	uint256 constant private BUY_TAX = 10;
	uint256 constant private SELL_TAX = 10;
	uint256 constant private STARTING_PRICE = 1e18;
	uint256 constant private INCREMENT = 1e13;

	string constant public name = "Krill Compounder";
	string constant public symbol = "cKRILL";
	uint8 constant public decimals = 18;

	struct User {
		uint256 balance;
		mapping(address => uint256) allowance;
		int256 scaledPayout;
	}

	struct Info {
		uint256 totalSupply;
		mapping(address => User) users;
		uint256 scaledKrillPerToken;
		uint256 openingTime;
		KRILL krill;
	}
	Info private info;


	event Transfer(address indexed from, address indexed to, uint256 tokens);
	event Approval(address indexed owner, address indexed spender, uint256 tokens);
	event Buy(address indexed buyer, uint256 amountSpent, uint256 tokensReceived);
	event Sell(address indexed seller, uint256 tokensSpent, uint256 amountReceived);
	event Withdraw(address indexed user, uint256 amount);
	event Reinvest(address indexed user, uint256 amount);


	constructor(KRILL _krill, uint256 _openingTime) {
		info.krill = _krill;
		info.openingTime = _openingTime;
	}

	function disburse(uint256 _amount) external {
		require(_amount > 0);
		uint256 _balanceBefore = info.krill.balanceOf(address(this));
		info.krill.transferFrom(msg.sender, address(this), _amount);
		uint256 _amountReceived = info.krill.balanceOf(address(this)) - _balanceBefore;
		info.scaledKrillPerToken += _amountReceived * FLOAT_SCALAR / info.totalSupply;
	}

	function buy(uint256 _amount) external returns (uint256) {
		return buyFor(_amount, msg.sender);
	}

	function buyFor(uint256 _amount, address _user) public returns (uint256) {
		require(_amount > 0);
		uint256 _balanceBefore = info.krill.balanceOf(address(this));
		info.krill.transferFrom(msg.sender, address(this), _amount);
		uint256 _amountReceived = info.krill.balanceOf(address(this)) - _balanceBefore;
		return _buy(_amountReceived, _user);
	}

	function tokenCallback(address _from, uint256 _tokens, bytes calldata) external returns (bool) {
		require(msg.sender == address(info.krill));
		require(_tokens > 0);
		_buy(_tokens, _from);
		return true;
	}

	function sell(uint256 _tokens) external returns (uint256) {
		require(balanceOf(msg.sender) >= _tokens);
		return _sell(_tokens);
	}

	function withdraw() external returns (uint256) {
		uint256 _dividends = dividendsOf(msg.sender);
		require(_dividends > 0);
		info.users[msg.sender].scaledPayout += int256(_dividends * FLOAT_SCALAR);
		info.krill.transfer(msg.sender, _dividends);
		emit Withdraw(msg.sender, _dividends);
		return _dividends;
	}

	function reinvest() external returns (uint256) {
		uint256 _dividends = dividendsOf(msg.sender);
		require(_dividends > 0);
		info.users[msg.sender].scaledPayout += int256(_dividends * FLOAT_SCALAR);
		emit Reinvest(msg.sender, _dividends);
		return _buy(_dividends, msg.sender);
	}

	function transfer(address _to, uint256 _tokens) external returns (bool) {
		return _transfer(msg.sender, _to, _tokens);
	}

	function approve(address _spender, uint256 _tokens) external returns (bool) {
		info.users[msg.sender].allowance[_spender] = _tokens;
		emit Approval(msg.sender, _spender, _tokens);
		return true;
	}

	function transferFrom(address _from, address _to, uint256 _tokens) external returns (bool) {
		require(info.users[_from].allowance[msg.sender] >= _tokens);
		info.users[_from].allowance[msg.sender] -= _tokens;
		return _transfer(_from, _to, _tokens);
	}

	function transferAndCall(address _to, uint256 _tokens, bytes calldata _data) external returns (bool) {
		_transfer(msg.sender, _to, _tokens);
		uint32 _size;
		assembly {
			_size := extcodesize(_to)
		}
		if (_size > 0) {
			require(Callable(_to).tokenCallback(msg.sender, _tokens, _data));
		}
		return true;
	}


	function totalSupply() public view returns (uint256) {
		return info.totalSupply;
	}

	function currentPrices() public view returns (uint256 truePrice, uint256 buyPrice, uint256 sellPrice) {
		truePrice = STARTING_PRICE + INCREMENT * totalSupply() / 1e18;
		buyPrice = truePrice * 100 / (100 - BUY_TAX);
		sellPrice = truePrice * (100 - SELL_TAX) / 100;
	}

	function balanceOf(address _user) public view returns (uint256) {
		return info.users[_user].balance;
	}

	function dividendsOf(address _user) public view returns (uint256) {
		return uint256(int256(info.scaledKrillPerToken * balanceOf(_user)) - info.users[_user].scaledPayout) / FLOAT_SCALAR;
	}

	function allInfoFor(address _user) external view returns (uint256 contractBalance, uint256 totalTokenSupply, uint256 truePrice, uint256 buyPrice, uint256 sellPrice, uint256 openingTime, uint256 userETH, uint256 userKRILL, uint256 userBalance, uint256 userDividends, uint256 userLiquidValue) {
		contractBalance = info.krill.balanceOf(address(this));
		totalTokenSupply = totalSupply();
		(truePrice, buyPrice, sellPrice) = currentPrices();
		openingTime = info.openingTime;
		userETH = _user.balance;
		userKRILL = info.krill.balanceOf(_user);
		userBalance = balanceOf(_user);
		userDividends = dividendsOf(_user);
		userLiquidValue = calculateResult(userBalance, false, false) + userDividends;
	}

	function allowance(address _user, address _spender) external view returns (uint256) {
		return info.users[_user].allowance[_spender];
	}

	function calculateResult(uint256 _amount, bool _isBuy, bool _inverse) public view returns (uint256) {
		uint256 _buyPrice;
		uint256 _sellPrice;
		( , _buyPrice, _sellPrice) = currentPrices();
		uint256 _rate = (_isBuy ? _buyPrice : _sellPrice);
		uint256 _increment = INCREMENT * (_isBuy ? 100 : (100 - SELL_TAX)) / (_isBuy ? (100 - BUY_TAX) : 100);
		if ((_isBuy && !_inverse) || (!_isBuy && _inverse)) {
			if (_inverse) {
				return (2 * _rate - _sqrt(4 * _rate * _rate + _increment * _increment - 4 * _rate * _increment - 8 * _amount * _increment) - _increment) * 1e18 / (2 * _increment);
			} else {
				return (_sqrt((_increment + 2 * _rate) * (_increment + 2 * _rate) + 8 * _amount * _increment) - _increment - 2 * _rate) * 1e18 / (2 * _increment);
			}
		} else {
			if (_inverse) {
				return (_rate * _amount + (_increment * (_amount + 1e18) / 2e18) * _amount) / 1e18;
			} else {
				return (_rate * _amount - (_increment * (_amount + 1e18) / 2e18) * _amount) / 1e18;
			}
		}
	}


	function _transfer(address _from, address _to, uint256 _tokens) internal returns (bool) {
		require(info.users[_from].balance >= _tokens);
		info.users[_from].balance -= _tokens;
		info.users[_from].scaledPayout -= int256(_tokens * info.scaledKrillPerToken);
		info.users[_to].balance += _tokens;
		info.users[_to].scaledPayout += int256(_tokens * info.scaledKrillPerToken);
		emit Transfer(_from, _to, _tokens);
		return true;
	}

	function _buy(uint256 _amount, address _user) internal returns (uint256 tokens) {
		require(block.timestamp >= info.openingTime);
		uint256 _tax = _amount * BUY_TAX / 100;
		tokens = calculateResult(_amount, true, false);
		info.totalSupply += tokens;
		info.users[_user].balance += tokens;
		info.users[_user].scaledPayout += int256(tokens * info.scaledKrillPerToken);
		info.scaledKrillPerToken += _tax * FLOAT_SCALAR / info.totalSupply;
		emit Transfer(address(0x0), _user, tokens);
		emit Buy(_user, _amount, tokens);
	}

	function _sell(uint256 _tokens) internal returns (uint256 amount) {
		require(info.users[msg.sender].balance >= _tokens);
		amount = calculateResult(_tokens, false, false);
		uint256 _tax = amount * SELL_TAX / (100 - SELL_TAX);
		info.totalSupply -= _tokens;
		info.users[msg.sender].balance -= _tokens;
		info.users[msg.sender].scaledPayout -= int256(_tokens * info.scaledKrillPerToken);
		info.scaledKrillPerToken += _tax * FLOAT_SCALAR / info.totalSupply;
		info.krill.transfer(msg.sender, amount);
		emit Transfer(msg.sender, address(0x0), _tokens);
		emit Sell(msg.sender, _tokens, amount);
	}

	function _sqrt(uint256 _n) internal pure returns (uint256 result) {
		uint256 _tmp = (_n + 1) / 2;
		result = _n;
		while (_tmp < result) {
			result = _tmp;
			_tmp = (_n / _tmp + _tmp) / 2;
		}
	}
}

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[{"inputs":[{"internalType":"contract KRILL","name":"_krill","type":"address"},{"internalType":"uint256","name":"_openingTime","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"address","name":"spender","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"buyer","type":"address"},{"indexed":false,"internalType":"uint256","name":"amountSpent","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"tokensReceived","type":"uint256"}],"name":"Buy","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Reinvest","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"seller","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokensSpent","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amountReceived","type":"uint256"}],"name":"Sell","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"from","type":"address"},{"indexed":true,"internalType":"address","name":"to","type":"address"},{"indexed":false,"internalType":"uint256","name":"tokens","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"user","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"Withdraw","type":"event"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"allInfoFor","outputs":[{"internalType":"uint256","name":"contractBalance","type":"uint256"},{"internalType":"uint256","name":"totalTokenSupply","type":"uint256"},{"internalType":"uint256","name":"truePrice","type":"uint256"},{"internalType":"uint256","name":"buyPrice","type":"uint256"},{"internalType":"uint256","name":"sellPrice","type":"uint256"},{"internalType":"uint256","name":"openingTime","type":"uint256"},{"internalType":"uint256","name":"userETH","type":"uint256"},{"internalType":"uint256","name":"userKRILL","type":"uint256"},{"internalType":"uint256","name":"userBalance","type":"uint256"},{"internalType":"uint256","name":"userDividends","type":"uint256"},{"internalType":"uint256","name":"userLiquidValue","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"},{"internalType":"address","name":"_spender","type":"address"}],"name":"allowance","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_spender","type":"address"},{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"approve","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"buy","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_user","type":"address"}],"name":"buyFor","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"bool","name":"_isBuy","type":"bool"},{"internalType":"bool","name":"_inverse","type":"bool"}],"name":"calculateResult","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"currentPrices","outputs":[{"internalType":"uint256","name":"truePrice","type":"uint256"},{"internalType":"uint256","name":"buyPrice","type":"uint256"},{"internalType":"uint256","name":"sellPrice","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"decimals","outputs":[{"internalType":"uint8","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_amount","type":"uint256"}],"name":"disburse","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_user","type":"address"}],"name":"dividendsOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"name","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"reinvest","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"sell","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"symbol","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"uint256","name":"_tokens","type":"uint256"},{"internalType":"bytes","name":"","type":"bytes"}],"name":"tokenCallback","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"totalSupply","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"transfer","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_tokens","type":"uint256"},{"internalType":"bytes","name":"_data","type":"bytes"}],"name":"transferAndCall","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256","name":"_tokens","type":"uint256"}],"name":"transferFrom","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"withdraw","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000f59bfeed034092e399cc43ff79edab15e2e187350000000000000000000000000000000000000000000000000000000061a61240

-----Decoded View---------------
Arg [0] : _krill (address): 0xf59BfEED034092E399Cc43Ff79EdAb15e2e18735
Arg [1] : _openingTime (uint256): 1638273600

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000f59bfeed034092e399cc43ff79edab15e2e18735
Arg [1] : 0000000000000000000000000000000000000000000000000000000061a61240

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