Guess the number

ringzer0ctf

Task: networked guessing game where you ask 11 non-adaptive subset-membership questions about a number in [0,100] and exactly one answer is a lie. Solution: model it as a length-11, minimum-distance-3 binary code built with a greedy lexicode, map each number to a codeword, and decode the noisy 11-bit answer to the nearest codeword to correct the single lie.