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/**
 *Submitted for verification at Etherscan.io on 2018-04-15
*/

pragma solidity ^0.4.21;

contract Auction {
    uint bidDivisor = 100;
    uint duration = 20 minutes;

    address owner;
    uint public prize;

    uint public bids;
    address public leader;
    uint public deadline;
    bool public claimed;

    function Auction() public payable {
        owner = msg.sender;
        prize = msg.value;
        bids = 0;
        leader = msg.sender;
        deadline = now + duration;
        claimed = false;
    }

    function getNextBid() public view returns (uint) {
        return (bids + 1) * prize / bidDivisor;
    }

    function bid() public payable {
        require(now <= deadline);
        require(msg.value == getNextBid());
        owner.transfer(msg.value);
        bids++;
        leader = msg.sender;
        deadline = now + duration;
    }

    function claim() public {
        require(now > deadline);
        require(msg.sender == leader);
        require(!claimed);
        claimed = true;
        msg.sender.transfer(prize);
    }
}

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