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Lottery.sol
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Lottery.sol
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// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;
contract Lottery {
address public manager;
address payable[] public players;
address payable public winner;
constructor() {
manager = msg.sender;
}
function participate() public payable {
require(msg.value == 1 ether, "Please pay 1 ether");
players.push(payable(msg.sender));
}
function getBalance() public view returns (uint) {
return address(this).balance;
}
function random() private view returns (uint) {
return uint(keccak256(abi.encodePacked(block.difficulty, block.timestamp, players.length)));
}
function pickWinner() public {
require(players.length >= 3, "Not enough players");
uint index = random() % players.length;
winner = players[index];
winner.transfer(getBalance());
players = new address payable[](0);
}
}