题目链接（测试数据弱化版）：https://www.luogu.com.cn/problem/P3371

题目链接（测试数据强化版）：https://www.luogu.com.cn/problem/P4779

import java.io.*;
import java.util.*;
class Edge implements Comparable<Edge> {
	int to, w;
	Edge() { to = w = 0; }
	Edge(int m_to, int m_w) {
		to = m_to;
		w = m_w;
	}
	public int compareTo(Edge obj) {
		return this.w - obj.w;
	}
}
class Main {
	static int INF = 0x7fffffff;
	static int[] dis;
	static boolean[] vis;
	static ArrayList<Edge>[] G;
	@SuppressWarnings("unchecked")
	private static void Init(int n) {
		dis = new int[n + 1];
		vis = new boolean[n + 1];
		G = new ArrayList[n + 1];
		Arrays.fill(dis, INF);
		Arrays.fill(vis, false);
		for(int i = 0; i <= n; ++i) {
			G[i] = new ArrayList<Edge>();
		}
	}
	private static void Dijkstra(int s, int n) {
		PriorityQueue<Edge> que = new PriorityQueue<Edge>();
		que.add(new Edge(s, 0));
		dis[s] = 0;
		while(!que.isEmpty()) {
			int u = que.poll().to;
			if(vis[u] == true) continue;
			vis[u] = true;
			for(int i = 0; i < G[u].size(); ++i) {
				Edge temp = G[u].get(i);
				if(dis[temp.to] > dis[u] + temp.w) {
					dis[temp.to] = dis[u] + temp.w;
					que.add(new Edge(temp.to, dis[temp.to]));
				}
			}
		}
	}
	public static void main(String[] args) throws IOException {
		StreamTokenizer input = new StreamTokenizer(new BufferedReader(new InputStreamReader(System.in)));
		input.nextToken();  //将Scanner改成流输入，否则会超时或者超内存
		int n = (int)input.nval;
		input.nextToken();
		int m = (int)input.nval;
		input.nextToken();
		int s = (int)input.nval;
		Init(n);
		for(int i = 1; i <= m; ++i) {
			input.nextToken();
			int u = (int)input.nval;
			input.nextToken();
			int v = (int)input.nval;
			input.nextToken();
			int w = (int)input.nval;
			G[u].add(new Edge(v, w));
		}
		Dijkstra(s, n);
		for(int i = 1; i <= n; ++i) {
			System.out.print(dis[i] + " ");
		}
	}
}