B. Mischievous Mess Makers 题目连接： http://www.codeforces.com/contest/655/problem/B Description It is a balmy spr…

D. Magic Breeding link http://codeforces.com/contest/878/problem/D description Nikita and Sasha play a compute…

A. Chat Server’s Outgoing Traffic 题目连接： http://www.codeforces.com/contest/5/problem/A Description Polyca…

B. Center Alignment 题目连接： http://www.codeforces.com/contest/5/problem/B Description Almost every text editor h…

D. Running with Obstacles 题目连接： http://www.codeforces.com/contest/637/problem/D Description A sportsman starts…

E. Memory and Casinos 题目连接： http://codeforces.com/contest/712/problem/E Description There are n casinos lined …

B. Qualifying Contest 题目连接： http://www.codeforces.com/contest/659/problem/B Description Very soon Berland will…

C. Anton and Fairy Tale 题目连接： http://codeforces.com/contest/785/problem/C Description Anton likes to listen to…

A. Alyona and mex 题目连接： http://codeforces.com/contest/739/problem/A Description Alyona’s mother wants to…

C. Dasha and Password 题目连接： http://codeforces.com/contest/761/problem/C Description After overcoming the stair…

E. Bear and Square Grid 题目连接： http://www.codeforces.com/contest/680/problem/E Description You have a grid with…

B. Rectangle and Square 题目连接： http://codeforces.com/contest/135/problem/B Description Little Petya very much l…