B. Preparing for the Contest 题目连接： http://codeforces.com/contest/377/problem/B Description Soon there will be …

E. New Reform 题目连接： http://www.codeforces.com/contest/659/problem/E Description Berland has n cities connected…

D. Bear and Chase 题目连接： http://codeforces.com/contest/679/problem/D Description Bearland has n cities, numbere…

3674: 可持久化并查集加强版 题目连接： http://www.lydsy.com/JudgeOnline/problem.php?id=3674 Description Description： 自从zkysb出了…

Problem K. KMC Attacks 题目连接： http://codeforces.com/gym/100714 Description Warrant VI is a remote planet locate…

Preorder Test 题目连接： http://www.codeforces.com/contest/627/problem/D Description For his computer science class…

E. Famil Door and Roads 题目连接： http://www.codeforces.com/contest/629/problem/E Description Famil Door’s City ma…

D. Follow Traffic Rules 题目连接： http://www.codeforces.com/contest/5/problem/D Description Everybody knows that t…

E. Interesting Graph and Apples 题目连接： http://www.codeforces.com/contest/9/problem/E Description Hexadecimal li…

B. Fox and Minimal path 题目连接： http://codeforces.com/contest/388/problem/B Description Fox Ciel wants to write …

Problem A. Alien Visit 题目连接： http://codeforces.com/gym/100714 Description Witness: “First, I saw only one UFO.…

E. The Last Fight Between Human and AI 题目连接： http://codeforces.com/contest/676/problem/E Description 100 years…