这场比赛我没有参加,不过就算参加了也估计是被完虐.于是看着题解把大部分题目都搞了一遍. T1:Movie(hdu 5214) 题目大意: 给出N个区间,问能否选出3个互不相交的区间. N<=106. 题解: 贪心的思想,先找出右端点最小的和左端点最大的,看中间能不能夹一个区间就好. T2:Cycle(hdu 5215) 题目大意: 给出一个无重边无自环的无向图,求有无简单的奇环和偶环.|V|<=105,|E|<=3*105. 题解: 1.如果只要求奇环的话 判一下二分图就可以了.偶环的情…

VK Cup 2015 - Round 1 (unofficial online mirror, Div. 1 only)E. The Art of Dealing with ATM Time Limit: 2 Sec  Memory Limit: 256 MBSubmit: xxx  Solved: 2xx 题目连接 http://codeforces.com/contest/529/problem/E Description ATMs of a well-known bank of a sm…

题目链接:http://codeforces.com/contest/522/problem/D 题目大意:  给你一个长度为n的序列,然后有m次查询,每次查询输入一个区间[li,lj],对于每一个查询,输出在这个区间内的两个相等的数的最短距离,如果没有相等的则输出-1. 线段树+扫描线,线段树维护的值是区间的最小值,从后往前扫,然后每次要做的事有两个: 1.判断当前这个位置 i 的数刚刚是不是出现过,假设刚刚出现的位置是 l ,如果出现过,则在线段树中把l这个位置的值更新为 l - i,同时更…

Name Quest time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A Martian boy is named s — he has got this name quite recently from his parents for his coming of age birthday. Now he enjoys loo…

Mean Requests time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output In this problem you will have to deal with a real algorithm that is used in the VK social network. As in any other company tha…

D. Haar Features Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/549/problem/D Description The first algorithm for detecting a face on the image working in realtime was developed by Paul Viola and Michael Jones in 2001. A p…

H. Degenerate Matrix Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/549/problem/H Description The determinant of a matrix 2 × 2 is defined as follows: A matrix is called degenerate if its determinant is equal to zero. The…

A. Face Detection Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/549/problem/A Description The developers of Looksery have to write an efficient algorithm that detects faces on a picture. Unfortunately, they are currently…

E. Correcting Mistakes Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/problemset/problem/533/E Description Analyzing the mistakes people make while typing search queries is a complex and an interesting work. As there is no guarant…

B. Looksery Party Time Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/549/problem/B Description The Looksery company, consisting of n staff members, is planning another big party. Every employee has his phone number and the pho…