A. Orchestra time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Paul is at the orchestra. The string section is arranged in an r × c rectangular grid and is filled with violinists with the ex…

B. Island Puzzle time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A remote island chain contains n islands, labeled 1 through n. Bidirectional bridges connect the islands to form a simple c…

B. Island Puzzle time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A remote island chain contains n islands, labeled 1 through n. Bidirectional bridges connect the islands to form a simple c…

A. Island Puzzle time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output A remote island chain contains n islands, labeled 1 through n. Bidirectional bridges connect the islands to form a simple c…

B. Island Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100114 Description On February 30th this year astronauts from the International Space Station flew over the Pacific Ocean and took a picture, on which was discovered a pr…

http://codeforces.com/problemset/problem/540/D 题目大意: 会出石头.剪刀.布的人分别有r,s,p个,他们相互碰到的概率相同,输的人死掉,问最终活下去的人是三种类型的概率. 思路: f[i][j][k]代表i个石头,j个剪刀,k个布状态的概率,初始f[n][m][K]=1 #include<cstdio> #include<cmath> #include<algorithm> #include<cstring>…

题目链接:https://vjudge.net/contest/226823#problem/D The Bad Luck Island is inhabited by three kinds of species: r rocks, s scissors and p papers. At some moments of time two random individuals meet (all pairs of individuals can meet equiprobably), and i…

[题目链接]:http://codeforces.com/contest/761/problem/E [题意] 给你一棵树,让你在平面上选定n个坐标; 使得这棵树的连接关系以二维坐标的形式展现出来; [题解] dfs来搞; 显然如果某个点的度数大于4就无解. 初始坐标为(0,0)然后每一层的边的长度变为上一层长度的1/2 初始层的长度为2 30   这样可以保证每层节点都不会和上一层的相交; 因为2 i >2 1 +2 2 +...+2 i−1   又因为最多只有30个节点,所以这么做肯定是可以…

题目描述: Bad Luck Island time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output The Bad Luck Island is inhabited by three kinds of species: r rocks, s scissors and p papers. At some moments of time…

Codeforces 题目传送门 & 洛谷题目传送门 下设 \(n,m\) 同阶. 首先有一个傻子都会的暴力做法,枚举矩形的上.下边界 \(l,r\),考虑集合多重集 \(S=\{y|x\in[l,r],(x,y)\text{为标记点}\}\),也就是所有在第 \(l\) 行与第 \(r\) 行之间所有标记点的列坐标的集合,考虑进一步枚举矩形的左端点 \(x\),那么对于右端点 \(y\),以 \((l,x)\) 为左上角,\((r,y)\) 为右下角的矩形中至少有 \(k\) 个标记点当前仅当…