摘要：
Navigation Nightmare Farmer John's pastoral neighborhood has N farms (2 <= N <= 40,000), usually numbered/labeled 1..N. A series of M (1 <= M < 40,000 阅读全文
摘要：
Parity game Now and then you play the following game with your friend. Your friend writes down a sequence consisting of zeroes and ones. You choose a 阅读全文