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题目描述： Arthur and his sister Caroll have been playing a game called Nim for some time now. Nim is played as follows: The starting position has a number of heaps, all containing some, not necessarily eq

Alice and Bob are playing a special chess game on an n × 20 chessboard. There are several chesses on the chessboard. They can move one chess in one turn. If there are no other chesses on the right adja

Alice and Bob are playing yet another game of stones. The rules of this game are as follow: The game starts with n piles of stones indexed from 1 to n. The i-th pile contains ai stones and a special ...