C. Journey time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Recently Irina arrived to one of the most famous cities of Berland — the Berlatov city. There are n showplaces in the city, numbe…

C. Journey time limit per test3 seconds memory limit per test256 megabytes inputstandard input outputstandard output Recently Irina arrived to one of the most famous cities of Berland — the Berlatov city. There are n showplaces to n, and some of them…

题目链接:http://codeforces.com/contest/283/problem/B 思路: dp[now][flag]表示现在在位置now,flag表示是接下来要做的步骤,然后根据题意记忆化搜索记忆,vis数组标记那些已经访问过的状态. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #define REP(i, a, b) for (i…

C. Journey time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Recently Irina arrived to one of the most famous cities of Berland — the Berlatov city. There are n showplaces in the city, numbe…

A题和B题是一如既往的签到题. C题是一道拓扑序dp题,题意是给定一个DAG,问你从1号点走到n号点,在长度不超过T的情况下,要求经过的点数最多,换个思维,设dp[i][j]表示到i号点时经过j个点的最小距离,我们按拓扑序转移即可,最后找到一个最大的x,使得dp[n][x]<=T即可,由于还要输出路径,我们就需要记录一下转移. #include <iostream> #include <cstdio> #include <cstring> #include <…

题目链接:http://codeforces.com/contest/721/problem/C C. Journey time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Recently Irina arrived to one of the most famous cities of Berland — the Berlato…

A. One-dimensional Japanese Crossword time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Recently Adaltik discovered japanese crosswords. Japanese crossword is a picture, represented as a tabl…

http://codeforces.com/contest/721/problem/C 题目大意:给你有向路,每条路都有一个权值t,你从1走到n,最多花费不能超过T,问在T时间内最多能访问多少城市? 思路:dp确实好玩,然而我不会TAT 首先我们定义dp[i][j]表示从i走到n,途中经过j个城市所需要的花费.接下来就枚举拓扑序就好了 //看看会不会爆int!数组会不会少了一维! //取物问题一定要小心先手胜利的条件 #include <bits/stdc++.h> using namespa…

D. Maxim and Array 题目连接: http://codeforces.com/contest/721/problem/D Description Recently Maxim has found an array of n integers, needed by no one. He immediately come up with idea of changing it: he invented positive integer x and decided to add or…

C. Journey 题目连接: http://codeforces.com/contest/721/problem/C Description Recently Irina arrived to one of the most famous cities of Berland - the Berlatov city. There are n showplaces in the city, numbered from 1 to n, and some of them are connected…