转载请注明出处: http://www.cnblogs.com/fraud/          ——by fraud Remmarguts' Date Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 21855   Accepted: 5958 Description "Good man never makes girls wait or breaks an appointment!" said the mand…

"Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly touching his little ducks' head, he told them a story. "Prince Remmarguts lives in his kingdom UDF – United Delta of Freedom. One day their ne…

POJ2449 比较裸的K短路问题 K短路听起来高大上 实际思路并不复杂 首先对终点t到其他所有点求最短路 即为dist[] 然后由起点s 根据当前走过的距离+dist[]进行A*搜索 第k次到达t即为第K短路 代码也很简单 //数组开的不够 不一定是运行时错误! 可能也会WA #include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> #include<cmath&g…

转载请注明出处,谢谢:http://www.cnblogs.com/KirisameMarisa/p/4303855.html   ---by 墨染之樱花 [题目链接]:http://poj.org/problem?id=2449 [题目描述]:给出图,求从起点到终点的第K短路 [思路]:求第K短的算法基于BFS搜索,当终点出队K次时,所走的总距离就是第K短路,不过这样那些不该走的路会被反复的走,造成许多空间时间浪费,这时候就要用到启发式的A*搜索.关于此算法的详细内容请自行查阅资料,这里简单的…

题意是让求从st的ed第k短路... 考虑A*算法:先把终点到每个点最短路跑出来(注意要建反图),当做估价函数h(u),然后跑A* 每次取出总代价最小的,即g(u)+h(u)最小的进行扩展,注意如果u被取出的次数c[u]>k,就不再进行扩展了. 当ed被取出且c[ed]==k,那么答案就是此时的g(ed) #include<cstdio> #include<iostream> #include<cstring> #include<queue> #def…

解题关键:k短路模板题,A*算法解决. #include<cstdio> #include<cstring> #include<algorithm> #include<cstdlib> #include<iostream> #include<cmath> #include<queue> using namespace std; typedef long long ll; ; ; const int inf=1e9; str…

K短路裸题. #include <algorithm> #include <iostream> #include <cstring> #include <cstdio> using namespace std; struct Edge{ int too, nxt, val; }edge[100005]; struct Odge{ int too, nxt, val; }odge[100005]; struct Node{ int idd, hfc, gfc;…

K短路/A* 经(luo)典(ti) K短路题目= = K短路学习:http://www.cnblogs.com/Hilda/p/3226692.html 流程: 先把所有边逆向,做一遍dijkstra,得到估价函数h(x)(x到T的最短路距离) f(x)=g(x)+h(x) 按f(x)维护一个堆……T第k次出堆时的g(T)即为ans 另外,需要特判:如果S==T,k++ Source Code Problem: User: sdfzyhy Memory: 11260K Time: 141MS…

http://poj.org/problem?id=2449 Remmarguts' Date Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 18168   Accepted: 4984 Description "Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly tou…

Remmarguts' Date Time Limit: 4000MS   Memory Limit: 65536K Total Submissions: 25216   Accepted: 6882 Description "Good man never makes girls wait or breaks an appointment!" said the mandarin duck father. Softly touching his little ducks' head, h…