743. 网络延迟时间(Dijkstra算法)
作者:互联网
Dijkstra算法
public int networkDelayTime(int[][] times, int n, int k) {
int max=Integer.MAX_VALUE/2;
int[][] g=new int[n][n];
for(int i=0;i<n;i++)
Arrays.fill(g[i],max);
int[] dist=new int[n];
Arrays.fill(dist,max);
boolean[] vis=new boolean[n];
for(int[] time:times){
g[time[0]-1][time[1]-1]=time[2];
}
//-----------------------------------------------
dist[k-1]=0;
for(int i=0;i<n;i++){
int x=-1;
for(int j=0;j<n;j++){
if(!vis[j]&&(x==-1||dist[j]<dist[x])){
x=j;
}
}
vis[x]=true;
for(int j=0;j<n;j++)
dist[j]=Math.min(dist[j],dist[x]+g[x][j]);
}
//-----------------------------------------------
int ans=Arrays.stream(dist).max().getAsInt();
return ans==max?-1:ans;
}
标签:743,dist,int,算法,vis,Dijkstra,延迟时间,time 来源: https://blog.csdn.net/xiang_yu_pai/article/details/119335916