The path Time Limit: 2000ms Memory Limit: 65536KB This problem will be judged on HDU. Original ID: 538564-bit integer IO format: %I64d      Java class name: Main Special Judge   You have a connected directed graph.Let d(x) be the length of the shorte…

http://acm.hdu.edu.cn/showproblem.php?pid=5385 题意: 给定一张n个点m条有向边的图,构造每条边的边权(边权为正整数),令d(x)表示1到x的最短路,使得存在点i(1<=i<=n)满足d(1)<d(2)<…<d(i)>d(i+1)>…>d(n). 从两边向中间构造. 开始L=1,R=n 从L开始bfs,顺次构造L,L+1,L+2…… 构造不动了再从R开始bfs,顺次构造R,R-1,R-2…… 然后在从L开始………

题目链接 最短路构造题三连:这道题,HDU4903,SRM590 Fox And City. \(Description\) 给定一张\(n\)个点\(m\)条边的有向图,每条边的边权在\([1,n]\)之间.记\(d[i]\)为\(1\)到\(i\)的最短路.你需要对每条边确定一个边权,使得存在一个\(i\in[2,n]\),满足\(d[1]\lt d[2]\lt...d[i]\gt d[i+1]\gt...d[n]\). 输出方案(每条边的边权).输入保证有解. \(n,m\leq10^5\…

题目传送门 /* 题意:给一张图和一些有向边,问如何给边赋值使得d1 < d2 < .. < dx > ,,,< ddn 贪心:左边从2开始,右边从n开始,每次选择未标记且相连的点加入树,加入时间就是d[i],若不在树上的输出n,注意重边和重点 */ /************************************************ * Author :Running_Time * Created Time :2015-8-13 12:09:17 * File…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=1973 Prime Path Description The ministers of the cabinet were quite upset by the message from the Chief of Security stating that they would all have to change the four-digit room numbers on their offices…

题目链接:pid=3631" style="font-size:18px">http://acm.hdu.edu.cn/showproblem.php?pid=3631 Shortest Path Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 3962    Accepted Submission(s): 9…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1973 Prime Path Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Problem Description The ministers of the cabinet were quite upset by the message from the Chief of Secu…

Shortest Path 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5636 Description There is a path graph G=(V,E) with n vertices. Vertices are numbered from 1 to n and there is an edge with unit length between i and i+1 (1≤i<n). To make the graph more in…

floyd算法好像很奇妙的样子.可以做到每次加入一个点再以这个点为中间点去更新最短路,效率是n*n. #include<cstdio> #include<cstring> #include<cmath> #include<vector> #include<algorithm> using namespace std; ; const int INF = 0x7FFFFFFF; int A[maxn][maxn], flag[maxn]; int…

Shortest Path Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 131072/131072 K (Java/Others) Total Submission(s): 1146 Accepted Submission(s): 358 Problem Description There is a path graph G=(V,E) with n vertices. Vertices are numbered from 1 to…