摘要：
You are given three n × n matrices A, B and C. Does the equation A × B = C hold true? You are given three n × n matrices A, B and C. Does the equation 阅读全文
摘要：
Alex doesn't like boredom. That's why whenever he gets bored, he comes up with games. One long winter evening he came up with a game and decided to pl 阅读全文