B. Alyona and Mex 题目连接： http://www.codeforces.com/contest/682/problem/B Description Someone gave Alyona an arr…

D. High Load 题目连接： http://codeforces.com/contest/828/problem/D Description Arkady needs your help again! This …

A. Mike and Cellphone 题目连接： http://www.codeforces.com/contest/689/problem/A Description While swimming at the …

E. Runaway to a Shadow 题目连接： http://www.codeforces.com/contest/681/problem/E Description Dima is living in a d…

D. Delivery Bears 题目连接： http://www.codeforces.com/contest/653/problem/D Description Niwel is a little golden b…

A. Letter 题目连接： http://www.codeforces.com/contest/14/problem/A Description A boy Bob likes to draw. Not long a…

B. Shopping 题目连接： http://www.codeforces.com/contest/665/problem/B Description Ayush is a cashier at the shoppi…

B. Skills 题目连接： http://www.codeforces.com/contest/613/problem/B Description Lesha plays the recently published…

F. st-Spanning Tree 题目连接： http://codeforces.com/contest/723/problem/F Description You are given an undirected …

D. Bear and Tower of Cubes 题目连接： http://www.codeforces.com/contest/680/problem/D Description Limak is a little…

A 题意：问你恰好修改一个字符，能不能使得字符串变成回文串 题解：显然直接for一遍，如果长度为偶数，那么不一样的必须是1个；如果长度为奇数，那么不一样的也可以是0个 #include<bits/stdc++.h&…

A. Brain’s Photos 题目连接： http://www.codeforces.com/contest/707/problem/A Description Small, but very brav…