摘要:
http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=5572 Chiaki has n intervals and the i-th of them is [li, ri]. She wants to delete some inte 阅读全文
摘要:
http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=3956 There are n courses in the course selection system of Marjar University. The i-th co 阅读全文