I was trying to solveCSES Shortest Routes Iusing priority_queue. However, I faced TLE even though I was storing negative of distance in it. After a bit of reading onCP-Algo's Page, they said that The main difference to the implementation with set is that in many languages, including C++...
第一遍写将n*n个数组进行了sort,tle,然后用了堆,保持堆的元素个数是n,复杂度从O(m*n^2*log n*n )变成O(m*n^2*logn) 1#include <cstdio>2#include <algorithm>3#include <queue>45usingnamespacestd;67constintmaxn =2000+10;89intv[2][maxn],A[maxn*maxn];1011intmain(intargc,charconst*...
#include <cstdio>#include<cstring>#include<iostream>#include<algorithm>#include<queue>#include<vector>#include#include<set>#include<string>usingnamespacestd;//---#defineCL(a,num) memset(a,num,sizeof(a));#defineBtoA(x,y) memcpy(x,y,sizeof(x));#defineeps 1e-12#defineinf 0x7fffffffty...
Algorithm Dijkstra(G, start, goal): let **open_list** be a priority_queue **open_list.**push(**start,** 0) g[start] = 0 while **open_list** is not empty do v = **open_list**.pop() mark v as visted if v is the **goal**: return v for **all unvisited neighbours**...
#include <cstring> #include <iostream> #include <algorithm> #include <queue> using namespace std; typedef pair<int, int> PII; const int N = 1e6 + 10; int n, m; int h[N], w[N], e[N], ne[N], idx; int dist[N]; bool st[N]; void add(int a, int b, int c) { e[...
POJ 3268 Dijkstra+priority_queue或SPFA 思路:正向建边,一遍Dijkstra,反向建边,再一遍Dijkstra。ans加在一起输出最大值。 (SPFA也行……) AI检测代码解析 // by SiriusRen #include <queue> #include <cstdio> #include <cstring> #include <algorithm>...
启发式搜索算法(Heuristic Algorithm)就是用来解决搜索效率问题的,下面将以贪婪最佳优先算法(Greedy Best First Search, GBFS)为例来介绍启发式搜索算法。 GBFS也是图搜索算法的一种,它的算法流程和BFS、DFS并没有本质的不同,区别仍然在于openlist...
[1] = 0; priority_queue<PII, vector<PII>, greater<PII>> heap; //小根堆 heap.push({0, 1}); // first存储距离,second存储节点编号 while (heap.size()) { auto t = heap.top(); heap.pop(); int ver = t.second, distance = t.first; if (st[ver]) continue; st[ver] = true; ...
#include<iostream>#include<cstring>#include<algorithm>using namespace std;constintN=110,INF=0x3f3f3f3f;int n,m;int d[N][N],g[N][N];// d[i][j] 是不经过点int pos[N][N];// pos存的是中间点kint path[N],cnt;// path 当前最小环的方案, cnt环里面的点的数量// 递归处理环上节...
SPFA是shortest Path Fast Algorithm的缩写,在国际上通称为“队列优化的Bellman-Ford算法”,仅在中国大陆流行“SPFA算法”的称谓。 算法流程 建立一个队列,最初队列中只含有起点start 取出队头节点x,扫描它的所有出边(x,y,z),若dist...