screen 尺寸为a:b video 尺寸为 c:d 如果a == c 则 面积比为 cd/ab=ad/cb (ad < cb) 如果b == d 则 面积比为 cd/ab=cb/ad  (cb < ad) 如果不相等时 如果a/b > c/d,则ad/bd > cb/db 则(ad > cb) screen尺寸可为 ad:bd, video的尺寸可为 cb:db 面积比为:cb*db/ad*bd = cb/ad (ad > cb) 如果a/b < c/d,则a…

题目链接:Codeforces Round #367 (Div. 2) C. Hard problem 题意: 给你一些字符串,字符串可以倒置,如果要倒置,就会消耗vi的能量,问你花最少的能量将这些字符串排成字典序 题解: 当时1点过头太晕了,看错题了,然后感觉全世界都会,就我不会,- -!结果就是一个简单的DP, 设dp[i][0]表示第i个字符串不反转的情况,dp[i][1]表示第i个字符串反转的情况 状态转移方程看代码 #include<bits/stdc++.h> #define F(…

Codeforces Round #603 (Div. 2) A. Sweet Problem A. Sweet Problem time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You have three piles of candies: red, green and blue candies: the first pile…

Hard problem 题目链接: http://codeforces.com/contest/706/problem/C Description Vasiliy is fond of solving different tasks. Today he found one he wasn't able to solve himself, so he asks you to help. Vasiliy is given n strings consisting of lowercase Engl…

A. Puzzles 对\(f[]\)排序,取连续的\(m\)个. B. Routine Problem 考虑\(\frac{a}{b}\)和\(\frac{c}{d}\)的大小关系,适配后就是分数的运算. C. Quiz 按\(k\)将\(n\)个问题分段,那么在没有分数翻倍的情况下最大题数为\[(k-1)\lfloor\frac{n}{k}\rfloor+n\%k\] 若\(m\le (k-1)\lfloor\frac{n}{k}\rfloor+n\%k\),则最大分数就为\(m\),否则翻…

题目连接:http://codeforces.com/contest/688/problem/C 题意:给你一些边,问你能否构成一个二分图 题解:二分图:二分图又称作二部图,是图论中的一种特殊模型. 设G=(V,E)是一个无向图,如果顶点V可分割为两个互不相交的子集(A,B),并且图中的每条边(i,j)所关联的两个顶点i和j分别属于这两个不同的顶点集(i in A,j in B),则称图G为一个二分图. 直接上一个DFS就搞定了 #include<cstdio> #include<set…

题目链接: http://codeforces.com/problemset/problem/337/D D. Book of Evil time limit per test2 secondsmemory limit per test256 megabytes 问题描述 Paladin Manao caught the trail of the ancient Book of Evil in a swampy area. This area contains n settlements num…

C. NP-Hard Problem 题目连接: http://www.codeforces.com/contest/688/problem/C Description Recently, Pari and Arya did some research about NP-Hard problems and they found the minimum vertex cover problem very interesting. Suppose the graph G is given. Subs…

链接: https://codeforces.com/contest/1263/problem/A 题意: You have three piles of candies: red, green and blue candies: the first pile contains only red candies and there are r candies in it, the second pile contains only green candies and there are g ca…

C. Tourist Problem time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Iahub is a big fan of tourists. He wants to become a tourist himself, so he planned a trip. There are n destinations on a…