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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";

contract LPStaking {
    IERC20 public landToken;
    IERC20 public stakingToken;

    uint public constant rewardRate = 70e18;
    uint public immutable startBlock;
    uint public immutable endBlock;
    uint public lastUpdateBlock;
    uint public rewardPerTokenStored;

    mapping(address => uint) public userRewardPerTokenPaid;
    mapping(address => uint) public rewards;

    uint256 private _totalSupply;
    mapping(address => uint256) private _balances;

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

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

    constructor(address _landToken, address _stakingToken)
    {
        stakingToken = IERC20(_stakingToken);
        landToken = IERC20(_landToken);
        startBlock = block.number;
        endBlock = block.number + 1e6;
    }

    function lastBlock() public view returns (uint256) {
        return block.number < endBlock ? block.number : endBlock;
    }

    function rewardPerToken() public view returns (uint) {
        if (_totalSupply == 0) {
            return rewardPerTokenStored;
        }
        return
        rewardPerTokenStored +
        (((lastBlock() - lastUpdateBlock) * rewardRate * 1e18) / _totalSupply);
    }

    function earned(address account) public view returns (uint) {
        return
        ((_balances[account] *
        (rewardPerToken() - userRewardPerTokenPaid[account])) / 1e18) +
        rewards[account];
    }

    modifier updateReward(address account) {
        rewardPerTokenStored = rewardPerToken();
        lastUpdateBlock = lastBlock();
        rewards[account] = earned(account);
        userRewardPerTokenPaid[account] = rewardPerTokenStored;
        _;
    }

    function exit() external {
        withdraw(_balances[msg.sender]);
        getReward();
    }

    function stake(uint _amount) external updateReward(msg.sender) {
        require(_amount > 0, "Cannot stake 0");
        _totalSupply += _amount;
        _balances[msg.sender] += _amount;
        stakingToken.transferFrom(msg.sender, address(this), _amount);
    }

    function withdrawAndGetReward(uint _amount) external {
        withdraw(_amount);
        getReward();
    }

    function withdraw(uint256 _amount) public updateReward(msg.sender) {
        require(_amount > 0, "Cannot withdraw 0");
        _totalSupply -= _amount;
        _balances[msg.sender] -= _amount;
        stakingToken.transfer(msg.sender, _amount);
    }

    function getReward() public updateReward(msg.sender) {
        uint reward = rewards[msg.sender];
        rewards[msg.sender] = 0;
        landToken.transfer(msg.sender, reward);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC20/IERC20.sol)

pragma solidity ^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 `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);

    /**
     * @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);
}

{
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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00000000000000000000000054aa569005332e4d6f91e27c55307aaef607c0e2000000000000000000000000d6be39d1166f57d2425fe655cca85ca4af15ef9d

-----Decoded View---------------
Arg [0] : _landToken (address): 0x54AA569005332e4d6f91e27C55307AAEF607c0E2
Arg [1] : _stakingToken (address): 0xD6be39D1166F57D2425fe655cCA85cA4Af15EF9d

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000054aa569005332e4d6f91e27c55307aaef607c0e2
Arg [1] : 000000000000000000000000d6be39d1166f57d2425fe655cca85ca4af15ef9d