F. Xors on Segments 题目连接： http://www.codeforces.com/contest/620/problem/F Description You are given an array w…

A. Alyona and Numbers 题目连接： http://www.codeforces.com/contest/682/problem/A Description After finishing eating…

C. Bear and Prime 100 题目连接： http://www.codeforces.com/contest/680/problem/C Description This is an interactive…

C. Sonya and Problem Wihtout a Legend 题目连接： http://codeforces.com/contest/713/problem/C Description Sonya was …

A. Crazy Town 题目连接： http://codeforces.com/contest/498/problem/A Description Crazy Town is a plane on which the…

A – Hometask 题意：给你一个字符串，然后再给你k个禁止挨在一起的字符串，问你最少删除多少个字符串，使得不会有禁忌的字符串对挨在一起。题目保证每个字符最多出现在一个禁忌中。 题解：由于每个字符只会出…

D. Alyona and Strings 题目连接： http://www.codeforces.com/contest/682/problem/D Description After returned from fo…

A. Buses Between Cities 题目连接： http://www.codeforces.com/contest/665/problem/A Description Buses run between th…

A. Prime Permutation 题目连接： http://www.codeforces.com/contest/123/problem/A Description You are given a string …

A. Orchestra 题目连接： http://www.codeforces.com/contest/635/problem/A Description Paul is at the orchestra. The s…

B. President’s Office 题目连接： http://codeforces.com/contest/6/problem/B Description President of Berland h…

C. Bear and Forgotten Tree 3 题目连接： http://www.codeforces.com/contest/658/problem/C Description A tree is a con…