思路 dfs(只不过要用邻接表存)邻接表是由表头结点和表结点两部分组成,其中表头结点存储图的各顶点,表结点用单向链表存储表头结点所对应顶点的相邻顶点(也就是表示了图的边).在有向图里表示表头结点指向其它结点(a->b),无向图则表示与表头结点相邻的所有结点(a—b) #include <cstdio> #include <cstring> #include <iostream> using namespace std; ; const int INF = 1e6;…

题目描述 城市中有R条有向马路,n个马路连接点,通过每条马路都要花去一定费用.你现在在编号为1的连接点 ,手里有k元钱,要去n号连接点的最短路径的长度是多少?途中经过道路的花费不能超过k.注意:两个 马路连接点间可能有多条马路 输入格式 第一行,k(0 <= K <= 10000) 第二行,n(2 <= N <= 100) 第三行,R(1 <= R <= 10000) 以下R行 x y L t 从x到y的马路,长度L(1<=每条马路的长度<=100),花费t…

poj   1251  Jungle Roads  (最小生成树) Link: http://poj.org/problem?id=1251 Jungle Roads Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 23507   Accepted: 11012 Description The Head Elder of the tropical island of Lagrishan has a problem. A b…

Jungle Roads Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 7096    Accepted Submission(s): 5185 Problem Description The Head Elder of the tropical island of Lagrishan has a problem. A burst of…

Rebuilding Roads Time Limit: 1000MS   Memory Limit: 30000K Total Submissions: 11495   Accepted: 5276 Description The cows have reconstructed Farmer John's farm, with its N barns (1 <= N <= 150, number 1..N) after the terrible earthquake last May. Th…

F. Constructing Roads There are N villages, which are numbered from 1 to N, and you should build some roads such that every two villages can connect to each other. We say two village A and B are connected, if and only if there is a road between A and…

Constructing Roads In JGShining's Kingdom  HDU1025 题目主要理解要用LCS进行求解! 并且一般的求法会超时!!要用二分!!! 最后蛋疼的是输出格式的注意(直接报错误!!!) #include<iostream> #include<stdio.h> #include<algorithm> #include<string.h> using namespace std; ],dp[]; int main() { ,…

Description Berland has n cities, the capital is located in city s, and the historic home town of the President is in city t (s ≠ t). The cities are connected by one-way roads, the travel time for each of the road is a positive integer. Once a year t…

树形DP..... Rebuilding Roads Time Limit: 1000MS Memory Limit: 30000K Total Submissions: 8188 Accepted: 3659 Description The cows have reconstructed Farmer John's farm, with its N barns (1 <= N <= 150, number 1..N) after the terrible earthquake last Ma…

ROADS Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 10777   Accepted: 3961 Description N cities named with numbers 1 ... N are connected with one-way roads. Each road has two parameters associated with it : the road length and the toll…