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*...
usingnamespacestd; #defineinf 0x7fffffff//inf表示无穷大 intVertex,edge[1000][1000],distD[1000],i,j; typedef pair<int,int>ele; voidinit() { for(i=1;i<=Vertex;i++)//结点坐标都是从1开始的 for(j=1;j<=Vertex;j++) { if(i==j) edge[i][j]=0; else edge[i][j]=inf; } }...
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++...
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> using namespace std; #define N 1005 int n,m,X,...
1 Dijkstra(单源点最短路径问题) 1.1 最短距离 1.1.1 伪代码 //图G一般设为全局变量;数组d为源点到达各点的最短路径长度,s为起点 Dijkstra(G,d[],s){ 初始化 for(循环n次) { u=使d[u]最小的但还未被访问的顶点的标号; 记u已被访问; ...
h> #include <stack> #include <algorithm> using namespace std; //#define LOCAL const int maxn = 55; int n,m,s,e, cnt,cntt,head[maxn],headd[maxn],d[maxn][2], num[maxn][2],indeg[maxn]; // d[i][0/1]是s到顶点i的最短/次短路长度, num[i][1/0]是s到顶点i的最短/...
SPFA算法:SPFA(Shortest Path Faster Algorithm);上面描述的Bellman-Ford算法,算法时间复杂度比较高;Bellman-Ford算法需要递推n次,每次递推需要扫描所有的边;然而每次松弛操作并不需要对所有的边松弛,只需要与当前找到最短路的点相连的边进行松弛;所以使用队列,每次将距离更新且不在队列中的点入队;每次从队列中取出一...
#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...
An improved Dijkstra algorithm is set forward on the basis of priority queue based on quad heap. It is proved in this paper that quad heap is the optimum among k ary heap. The presented algorithm decreases the complexity of conventional Dijkstra algorithm to O (log n ). Considering the ...
第C++实现Dijkstra算法的示例代码EdgeNode*e=VexList[i].firstedge; while(e){//然后就开始遍历输出每个边表所存储的邻接点的下标 if(e-cost==-1){ cout"---"e-adjvex; else{ cout"--"e-cost"--"e-adjvex; e=e-next; coutendl; voidGraphList::CreateGraph(){ EdgeNode*e=newEdgeNode(); cout...