luogu3371 【模板】单源最短路径 dijkstra堆优化

#include <algorithm>
#include <iostream>
#include <cstring>
#include <cstdio>
using namespace std;
int n, m, s, dis[10005], din, uu, vv, ww, hea[10005], cnt;
bool vis[10005];
struct Node{
	int idx, val;
}dui[1100005];
struct Edge{
	int too, nxt, val;
}edge[1000005];
bool cmp(Node x, Node y){
	return x.val>y.val;
}
void add_edge(int fro, int too, int val){
	edge[++cnt].nxt = hea[fro];
	edge[cnt].too = too;
	edge[cnt].val = val;
	hea[fro] = cnt;
}
int main(){
	cin>>n>>m>>s;
	for(int i=1; i<=m; i++){
		scanf("%d %d %d", &uu, &vv, &ww);
		add_edge(uu, vv, ww);
	}
	memset(dis, 0x3f, sizeof(dis));
	dis[s] = 0;
	dui[++din] = (Node){s, 0};
	while(din){
		Node x=dui[1];
		pop_heap(dui+1, dui+1+din, cmp);
		din--;
		if(vis[x.idx])	continue;
		vis[x.idx] = true;
		for(int i=hea[x.idx]; i; i=edge[i].nxt){
			int t=edge[i].too;
			if(!vis[t] && dis[t]>dis[x.idx]+edge[i].val){
				dis[t] = dis[x.idx] + edge[i].val;
				dui[++din] = (Node){t, dis[t]};
				push_heap(dui+1, dui+1+din, cmp);
			}
		}
	}
	for(int i=1; i<=n; i++)
		if(dis[i]==0x3f3f3f3f)	printf("2147483647 ");
		else	printf("%d ", dis[i]);
	printf("
");
	return 0;
}