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C. Enduring Exodus time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output In an attempt to escape the Mischievous Mess Maker

B. Robin Hood time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output We all know the impressive story of Robin Hood. Robin Ho

打了一场实时cf。。事实证明本来就不聪明，打到3点真tmd够呛   A. Holidays time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output On the planet Mar

唉，打得不好。。。第一题错了一次就算了，第二题根本就想错了！照着错误的方向想了半天，每次都错在第4组数据。。回头一想，觉得简单，再一打，错到了第28组数据，后来陆陆续续错到了第36组，第1组。。第83组。。。。。。。好吧，掉分我也认了。。。反正我菜。。 A. Nicholas and Permutation time limit per test 1 se

昨晚上被叫去打cf，实在脑袋大，居然没有和他们撕逼。。。好吧，两天没睡觉还是能做出一题的。。。。 A. Rewards time limit per test 1 second memory limit per test 256 megabytes input standard input output standard

1、常见的二分，只需确定最大最小的范围在里面找就行了 http://codeforces.com/problemset/problem/670/D2 2、变无序为有序的二分，常用前缀和。 http://codeforces.com/problemset/problem/676/C 3、顺序需要你构造的二分，比如说codeforces671B和另外一到矩阵（a[i][j] = i *

C. Hard Process time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You are given an array a with n elements. Each eleme

C. Magic Five time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output There is a long plate s containing n digits. Iahub want