Bus System Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5190    Accepted Submission(s): 1275 [题目链接]http://acm.hdu.edu.cn/showproblem.php?pid=1690 [解题思路]SPFA求最短路径问题,将每个站之间的距离转化为相应的价格从而建立两站点相连的…

Problem Description Because of the huge population of China, public transportation is very important. Bus is an important transportation method in traditional public transportation system. And it's still playing an important role even now. The bus sy…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1690 Bus System Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 6569    Accepted Submission(s): 1692 Problem Description Because of the huge popula…

注意:不要再return 的语句之后加,那样就执行不到了. system() 是调用系统命令:pause 暂停命令: 如果加有  system(”pause“): 这样在运行到此处时,会显示“Press any key to continue . . .” 也就是 “按任意键继续...”: 在VC 6.0下,要添加如下的头文件! #include <stdlib.h>   在c++  程序中用#include<iostream>也可以…

3.1最短路之单源最短路(SPFA) 松弛:常听人说松弛,一直不懂,后来明白其实就是更新某点到源点最短距离. 邻接表:表示与一个点联通的所有路. 如果从一个点沿着某条路径出发,又回到了自己,而且所经过的边上的权和小于0, 就说这条路是一个负权回路. 回归正题,SPFA是bellman-ford的一种改进算法,由1994年西安交通大学段凡丁提出.它无法处理带有负环的图,判断方法:如果某个点进入队列的次数超过N次则存在负环. SPFA的两种写法,bfs和dfs,bfs判别负环不稳定,相当于限深度搜索…

HDU.2612 Find a way (BFS) 题意分析 圣诞节要到了,坤神和瑞瑞这对基佬想一起去召唤师大峡谷开开车.百度地图一下,发现周围的召唤师大峡谷还不少,这对基佬纠结着,该去哪一个...坤神:我要去左边的这个(因为离自己比较近 哈哈~)..瑞瑞:我要去右边的这个(因为离自己比较近 嘿嘿~) --..这对基佬闹矛盾了,开车有危险了! 为了不让他们去召唤师大峡谷坑人,riot决定让他们去X召唤师大峡谷,保证他俩所走的路程和最短.每走一个点需要花费11分钟,输出他们一共花费多少时间(最短时…

HDU.1233 还是畅通工程(Prim) 题意分析 首先给出n,代表村庄的个数 然后出n*(n-1)/2个信息,每个信息包括村庄的起点,终点,距离, 要求求出最小生成树的权值之和. 注意村庄的编号从1开始即可 直接跑prim 代码总览 #include <bits/stdc++.h> #define nmax 105 #define inf 1e8+7 using namespace std; int mp[nmax][nmax]; int n; int totaldis =0; void…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=4370 题目大意:有一个n*n的矩阵Cij(1<=i,j<=n),要找到矩阵Xij(i<=1,j<=n)满足以下条件: 1.X 12+X 13+...X 1n=1  2.X 1n+X 2n+...X n-1n=1  3.for each i (1<i<n), satisfies ∑X ki (1<=k<=n)=∑X ij (1<=j<=n). 举个例子…

Problem Description Because of the huge population of China, public transportation is very important. Bus is an important transportation method in traditional public transportation system. And it’s still playing an important role even now.The bus sys…

Bus System Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 6082    Accepted Submission(s): 1560 Problem Description Because of the huge population of China, public transportation is very importa…