E. Prefix Enlightenment time limit per test3 seconds memory limit per test256 megabytes There are ...

F. Economic Difficulties An electrical grid in Berland palaces consists of 2 grids: main and reserv ...

D. Yet Another Monster Killing Problem You play a computer game. In this game, you lead a party of ...

D. 0-1 MST Ujan has a lot of useless stuff in his drawers, a considerable part of which are his mat ...

C. Tile Painting Ujan has been lazy lately, but now has decided to bring his yard to good shape. Fi ...

E. Editor The development of a text editor is a hard problem. You need to implement an extra module ...

F. Coffee Varieties time limit per test1 second memory limit per test256 megabytes This is the eas ...

C. Everyone is a Winner! On the well-known testing system MathForces, a draw of n rating units is a ...

A. Bear and Five Cards 题目连接： http://www.codeforces.com/contest/680/problem/A Description ...

E. Yet Another Division Into Teams There are n students at your university. The programming skill o ...