A. Exam time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output An exam for n students will take place in a long and narrow room, so the students will sit in a line in some order. The teacher suspects that students with adjacent numbers (i and i + 1) always studied …

http://codeforces.com/problemset/problem/479/D 题意是说有一把尺子，本身有一些刻度，然后需要测量x和y，问最少需要添加多少个刻度，如果需要，这些刻度分别添加在什么位置。 一开始没有看清题目，以为答案最多为4，但是发现，a[1]=0 a[n]=l这两个是确定的，所以答案最多为2， 而不会出现中间有两个刻度，无论是往前刻还是往后都会越界的情况。 先去看看已知的刻度里有没有直接满足的。 除此之外，如果在已知的刻度下无法测量x也无法测量y，我们还可以找找是否能有公用点使得只刻一个刻度就可以满足题意。公用点分两种情况，一种是在两个刻度之间，另一种是在两个刻度的同侧。 前一种没什么坑，后一种要判断是 …

http://codeforces.com/problemset/problem/525/B 题意是说一个字符串，进行m次颠倒变换（从a[i]位置到a[l-i+1]位置），问得到的字符串。容易发现，对于越在里边（对称，也就是越靠近中间位置）的字符，调换的次数越多。我们可以把a[i]从小到大排序。然后经过分析发现，把两个相邻的a[i]分为一组，做处理，如果m为奇数，最后还剩下a[m]没有被分组，要单独处理a[m]细节上要注意st数组是从st[0]开始的...好吧的确不方便，适牛也说我了。。数组下标以后还是从0开始吧。。。主要是受高中OI用的pascal的影响。。。那个数组下标随便啊。代码： 1 2 3 /* …

C - C **Time Limit:**1000MS **Memory Limit:**262144KB 64bit IO Format:%I64d & %I64u Submit Status Description Permutation_p_ is an ordered set of integers _p_1, p_2, ..., p__n, consisting of n distinct positive integers not larger than n. We'll denote as_n the length of permutation _p_1, _p_2, ..., p__n. Your task …

http://codeforces.com/problemset/problem/479/C 1/************************************************ 2Author :111qqz 3Created Time :2016年02月22日 星期一 23时31分10秒 4File Name :code/cf/problem/479C.cpp 5************************************************ */ 6 7#include <iostream>8#include <algorithm>9#include …

FatMouse's Speed Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 10172 Accepted Submission(s): 4521 Special Judge Problem Description FatMouse believes that the fatter a mouse is, the faster it runs. To disprove this, you want to take the data on a collection of …

Tickets **Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 1408 Accepted Submission(s): 687 ** Problem Description Jesus, what a great movie! Thousands of people are rushing to the cinema. However, this is really a tuff time for Joe who sells the film tickets. He is …

免费馅饼 **Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 29065 Accepted Submission(s): 9921 ** Problem Description 都说天上不会掉馅饼，但有一天gameboy正走在回家的小径上，忽然天上掉下大把大把的馅饼。说来gameboy的人品实在是太好了，这馅饼别处都不掉，就掉落在他身旁的10米范围内。馅饼如果掉在了地上当然就不能吃了，所以gameboy马上卸下身上的背包去接。但由于小径两侧都不能站人，所以他只能在小径上接。由 …

F - Piggy-Bank **Time Limit:**1000MS **Memory Limit:**32768KB 64bit IO Format:%I64d & %I64u Submit Status Description Before ACM can do anything, a budget must be prepared and the necessary financial support obtained. The main income for this action comes from Irreversibly Bound Money (IBM). The idea behind is …

E - Super Jumping! Jumping! Jumping! **Time Limit:**1000MS **Memory Limit:**32768KB 64bit IO Format:%I64d & %I64u Submit Status Description Nowadays, a kind of chess game called "Super Jumping! Jumping! Jumping!" is very popular in HDU. Maybe you are a good boy, and know little about this game, so I …