摘要:
"题目来源" Eva loves to collect coins from all over the universe, including some other planets like Mars. One day she visited a universal shopping mall wh 阅读全文
摘要:
"题目来源" Given two strings S 1 and S 2, S = S 1− S 2 is defined to be the remaining string after taking all the characters in S 2 from S 1. Your task is 阅读全文