题目链接: 题意: 给定n个单词. 以下有m个替换方式.左边的单词能变成右边的单词. 替换随意次后使得最后字母r个数最少,在r最少的情况下单词总长度最短 输出字母r的个数和单词长度. 思路: 我们觉得一个单词有2个參数.则m个替换规则能够当成m个点的有向图. 则某些单词的替换终点会确定,所以反向建图bfs一下. 为了防止某些点被重复更新,所以把每一个点的权值都放到栈里排个序然后bfs. #include<stdio.h> #include<string.h> #include<…

D. Fedor and Essay time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output After you had helped Fedor to find friends in the «Call of Soldiers 3» game, he stopped studying completely. Today, the E…

D. Fedor and Essay time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output After you had helped Fedor to find friends in the «Call of Soldiers 3» game, he stopped studying completely. Today, the E…

  Codeforces Round #267 (Div. 2) CF#267D D - Fedor and Essay D. Fedor and Essay time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output After you had helped Fedor to find friends in the «Call of S…

题目链接 D. Fedor and Essay time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output After you had helped Fedor to find friends in the «Call of Soldiers 3» game, he stopped studying completely. Today,…

Codeforces 467 D 题意:给\(m​\)个单词,以及\(n​\)个置换关系,问将\(m​\)个单词替换多次后其中所含的最少的\(R​\)的数量以及满足这个数量的最短总长度 思路:首先将置换关系构图,然后进行强连通分量分解,为每一个强连通分量保存最小的答案,然后\(dp​\)把一个子\(dag​\)的答案求出即可. \(wa\)了\(3\)次,前\(2\)次是因为\(tarjan\)写错了,另一次是因为没开\(long\ long\).…

题意:给一篇文章,再给一些单词替换关系a b,表示单词a可被b替换,可多次替换,问最后把这篇文章替换后(或不替换)能达到的最小的'r'的个数是多少,如果'r'的个数相等,那么尽量是文章最短. 解法:易知单词间有二元关系,我们将每个二元关系建有向边,然后得出一张图,图中可能有强连通分量(环等),所以找出所有的强连通分量缩点,那个点的minR,Len赋为强连通分量中最小的minR,Len,然后重新建图,跑一个dfs即可得出每个强连通分量的minR,Len,最后O(n)扫一遍替换单词,统计即可. 代码…

After you had helped Fedor to find friends in the «Call of Soldiers 3» game, he stopped studying completely. Today, the English teacher told him to prepare an essay. Fedor didn't want to prepare the essay, so he asked Alex for help. Alex came to help…

F. FloodTime Limit: 20 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/gym/100685/problem/F Description We all know that King Triton doesn't like us and therefore shipwrecks, hurricanes and tsunami do happen. But being bored with the same routine…

http://codeforces.com/problemset/problem/540/C       Ice Cave Time Limit:2000MS     Memory Limit:262144KB     64bit IO Format:%I64d & %I64u Submit Status Practice CodeForces 540C Description You play a computer game. Your character stands on some lev…