摘要：
//http://codeforces.com/contest/631/problem/Apackage codeforces344; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStr 阅读全文
摘要：
A. Watchmen time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Watchmen are in a danger and 阅读全文
摘要：
B. A Trivial Problem time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Mr. Santa asks all 阅读全文