On the way to school, Karen became fixated on the puzzle game on her phone! The game is played as follows. In each level, you have a grid with n rows and m columns. Each cell originally contains the number 0. One move consists of choosing one row or…

On the way to school, Karen became fixated on the puzzle game on her phone! The game is played as follows. In each level, you have a grid with n rows and mcolumns. Each cell originally contains the number 0. One move consists of choosing one row or c…

Squats Time Limit: 1000MS   Memory Limit: 262144KB   64bit IO Format: %I64d & %I64u Submit Status Description Pasha has many hamsters and he makes them work out. Today, n hamsters (n is even) came to work out. The hamsters lined up and each hamster e…

https://codeforces.com/contest/1060/problem/E 题意 给一颗树,在原始的图中假如两个点连向同一个点,这两个点之间就可以连一条边,定义两点之间的长度为两点之间的最少边数,求加边之后任意两点长度之和 思路 一看到求任意两点,知道需要用每条边的贡献计算(每条边使用了多少次) 每条边的贡献等于边左边的点数*边右边的点数 然后就一直不知道怎么解决加边后的问题,不知道要标记哪些东西,怎么减去 单独看一条路径,加边之后, 假如边数是偶数的话,边数/2 假如边数是奇数…

https://codeforces.com/problemset/problem/353/D 大意:给定字符串, 每一秒, 若F在M的右侧, 则交换M与F, 求多少秒后F全在M左侧 $dp[i]$为位置$i$处的$F$复位所花费时间, 有 $dp[i] = max(dp[i-1]+1,cnt_i)$, $cnt_i$为前$i$位$M$的个数 $dp$最大值即为答案 #include <iostream> #include <algorithm> #include <cstd…

传送门:http://codeforces.com/contest/816/problem/C 本题是一个模拟问题. 有一个n×m的矩阵.最初,这个矩阵为零矩阵O.现有以下操作: a.行操作“row i”:对第i(1≤i≤n)行的所有元素加一: b.列操作“col j”:对第j(1≤j≤m)列的所有元素加一. 经过有限次操作,矩阵变为$G=(g_{i,j})_{m*n}$. 对于给定的矩阵G,试判断G是否可以由零矩阵O通过有限次的“行操作”和“列操作”生成?若可以,则求一个操作步数最小的方案:否…

[题目链接]:http://codeforces.com/contest/816/problem/C [题意] 给你一个n*m的矩阵; 一开始所有数字都是0; 每次操作,你能把某一行,或某一列的数字全部加上1; 问你到达目标矩阵最少需要进行多少次操作; [题解] 从目标矩阵开始减; 直接枚举每一列需要减多少次; 每一行需要减多少次即可; 但有技巧; 比如以下矩阵 1 1 1 1 1 1 1 1 1 1 1 1 应该一列一列地减比较快; 而 1 1 1 1 1 1 1 1 一行一行地删比较快; 所…

(点击此处查看原题) 题意分析 已知 n , p , w, d ,求x , y, z的值 ,他们的关系为: x + y + z = n x * w + y * d = p 思维法 当 y < w 的时候,我们最多通过1e5次枚举确定答案 而当 y >= w 的时候,平局所得分为:y * d = (y-w)*d + w*d ,可以看作平局的局数为 y - w ,多出的w*d贡献给 (w*d)/w = d 局胜局,所以胜局为 x + d ,说明此时用x+y局胜局和平局得到的分数可以由 x + d…

Crash Time Limit: 1000MS   Memory Limit: 262144KB   64bit IO Format: %I64d & %I64u Submit Status Description During the "Russian Code Cup" programming competition, the testing system stores all sent solutions for each participant. We know th…

Elimination Time Limit: 1000MS   Memory Limit: 262144KB   64bit IO Format: %I64d & %I64u Submit Status Description The finalists of the "Russian Code Cup" competition in 2214 will be the participants who win in one of the elimination rounds.…