PrivateSaleBenchMark1.md

contract PresaleBenchmark {

    uint256 private constant MAX_INT = 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff;
    uint256[3] arr = [MAX_INT, MAX_INT, MAX_INT];

    function claimTicketOrBlockTransaction(uint256 ticketNumber) external {
        require(ticketNumber < arr.length * 256, "too large");
        uint256 storageOffset = ticketNumber / 256;
        uint256 offsetWithin256 = ticketNumber % 256;
        uint256 storedBit = (arr[storageOffset] >> offsetWithin256) & uint256(1);
        require(storedBit == 1, "already taken");

        arr[storageOffset] = arr[storageOffset] & ~(uint256(1) << offsetWithin256);
    }
}