题目链接:http://codeforces.com/contest/208/problem/C 思路:题目要求的是经过1~N的最短路上的某个点的路径数 /  最短路的条数的最大值.一开始我是用spfa得到从1开始的最短路和从N开始的最短路,然后分别从N开始记忆化搜索,得到从1到达最短路径上的u的路径条数,记作dp1[u], 然后再从1开始搜,得到最短路径上从N到达某个点u的路径条数,记作dp2[u],于是经过某个点u的最短路径数目为dp1[u] * dp2[u],然后只需枚举u求最大值即可.…

题目链接: http://codeforces.com/problemset/problem/208/C C. Police Station time limit per test:2 secondsmemory limit per test:256 megabytes 问题描述 The Berland road network consists of n cities and of m bidirectional roads. The cities are numbered from 1 to…

题目链接: http://codeforces.com/problemset/problem/208/A A. Dubstep time limit per test:2 secondsmemory limit per test:256 megabytes 问题描述 Vasya works as a DJ in the best Berland nightclub, and he often uses dubstep music in his performance. Recently, he…

A. Dubstep 字符串模拟. string.find()用法 string str; size_t pos = str.find("WUB"); // 返回匹配的第一个位置 size_t nxt = str.find("WUB", pos); // 返回大于等于pos的第一个匹配位置 // 如果没有找到,则返回std::string::npos B. Solitaire \(dp(i,j,k)\)表示是否能到达倒三张牌分别为\(i,j,k\)的状态. C. P…

Codeforces Round #580 (Div. 1) https://codeforces.com/contest/1205 A. Almost Equal 随便构造一下吧...太水了不说了,放个代码吧. #include<bits/stdc++.h> using namespace std; void read(int &x) { x=0;int f=1;char ch=getchar(); for(;!isdigit(ch);ch=getchar()) if(ch=='-'…

Codeforces Round #366 (Div. 2) A I hate that I love that I hate it水题 #I hate that I love that I hate it n = int(raw_input()) s = "" a = ["I hate that ","I love that ", "I hate it","I love it"] for i in ran…

Codeforces Round #354 (Div. 2) Problems     # Name     A Nicholas and Permutation standard input/output 1 s, 256 MB    x3384 B Pyramid of Glasses standard input/output 1 s, 256 MB    x1462 C Vasya and String standard input/output 1 s, 256 MB    x1393…

直达–>Codeforces Round #368 (Div. 2) A Brain’s Photos 给你一个NxM的矩阵,一个字母代表一种颜色,如果有”C”,”M”,”Y”三种中任意一种就输出”#Color”,如果只有”G”,”B”,”W”就输出”#Black&White”. #include <cstdio> #include <cstring> using namespace std; const int maxn = 200; const int INF =…

 cf之路,1,Codeforces Round #345 (Div. 2) ps:昨天第一次参加cf比赛,比赛之前为了熟悉下cf比赛题目的难度.所以做了round#345连试试水的深浅.....       其实这个应该是昨天就写完的,不过没时间了,就留到了今天.. 地址:http://codeforces.com/contest/651/problem/A A. Joysticks time limit per test 1 second memory limit per test 256…

Codeforces Round #279 (Div. 2) 做得我都变绿了! Problems     # Name     A Team Olympiad standard input/output 1 s, 256 MB  x2377 B Queue standard input/output 2 s, 256 MB  x1250 C Hacking Cypher standard input/output 1 s, 256 MB  x740 D Chocolate standard in…