练习!! 这里主要需要注意的是进队的条件和dp[][]状态的控制,dp[i][j]表示到第i个城市剩余汽油为j的最小花费. 代码: #include<iostream> #include<queue> #include<cstdio> #include<cstring> #define inf 100000000 #define MAXN 1200 #define MAXM 1200 using namespace std; int head[MAXN],p…

题目链接:http://poj.org/problem?id=3635 题意题解等均参考:POJ 3635 - Full Tank? - [最短路变形][优先队列优化Dijkstra]. 一些口胡: 说实话,上次写类似的二维状态最短路Gym 101873C - Joyride - [最短路变形][优先队列优化Dijkstra],我没能把手写二叉堆优化Dijkstra的给写出来. 这次费了点功夫,也算是给写出来了,需要注意的点还是有点多的.而且我终于深刻理解为啥不推荐手写二叉堆了,主要是代码量相比…

任意门:http://poj.org/problem?id=3635 Full Tank? Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 8388   Accepted: 2734 Description After going through the receipts from your car trip through Europe this summer, you realised that the gas pri…

输入一个无向图<V,E>    V<=1e5, E<=3e5 现在另外给k条边(u=1,v=s[k],w=y[k]) 问在不影响从结点1出发到所有结点的最短路的前提下,最多可以删除k条边的多少条 跑最短路的时候维护或者统计就好了 一开始用spfa.然后TLE 45...好久没写  Dij+堆优化   ... p.s.优先队列默认大顶堆 Dij+堆优化   264ms #include <cstdio> #include <cstring> #include…

Full Tank? Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 5857   Accepted: 1920 Description After going through the receipts from your car trip through Europe this summer, you realised that the gas prices varied between the cities you v…

写这个dij+堆优化的原因是有些地方卡SPFA,只能搞这个: 香甜的奶油: #include<iostream> #include<cstdio> #include<cstring> #include<string> #include<cstdlib> #include<ctime> #include<vector> #include<algorithm> #include<queue> using…

题目链接:http://poj.org/problem?id=3635 Description After going through the receipts from your car trip through Europe this summer, you realised that the gas prices varied between the cities you visited. Maybe you could have saved some money if you were…

模板 意甲冠军:给你一个图,1始终根,每一方都有单价值,每个点都有权重新. 每个边缘的价格值 = sum(后继结点重)*单价方值. 最低价格要求树值,它构成了一棵树n-1条边的最小价值. 算法: 1.由于每一个边的价值都要乘以后来訪问的节点的权重.而走到后来訪问的点必经过这条边. 实际上总价值就是  到每一个点的最短路径*这个点的权重. 2.可是这个题 数据量真的太大了.50000个点,50000条边. 写普通的dij算法tle. 必须加优先队列优化- - 据说spfa也能过.可是spfa算法不…

Cleaning Shifts Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 4721   Accepted: 1593 Description Farmer John's cows, pampered since birth, have reached new heights of fastidiousness. They now require their barn to be immaculate. Farmer…

#include<iostream> #include<cstdio> #include<cstring> #include<queue> #define maxn 110 #define pa pair<int,int> using namespace std; int n,num,head[maxn],dis[maxn],ans,len=0x7fffffff,f[maxn]; struct node { int u,v,t,pre; }e[m…