#include <iostream>
#include <vector>
#include <queue>
#include <climits>
using namespace std;

void dijkstra(vector<vector<pair<int, int>>>& adj, int start) {
    int n = adj.size();
    vector<int> dist(n, INT_MAX);
    priority_queue<pair<int, int>, vector<pair<int, int>>, greater<pair<int, int>>> pq;

    dist[start] = 0;
    pq.push({0, start});

    while (!pq.empty()) {
        int u = pq.top().second;
        int d = pq.top().first;
        pq.pop();

        if (d > dist[u]) continue; // 跳过过时的条目

        for (auto& edge : adj[u]) {
            int v = edge.first;
            int weight = edge.second;

            if (dist[u] + weight < dist[v]) {
                dist[v] = dist[u] + weight;
                pq.push({dist[v], v});
            }
        }
    }

    // 输出结果
    for (int i = 0; i < n; i++) {
        cout << "从起点到" << i << "的最短距离: ";
        if (dist[i] == INT_MAX)
            cout << "不可达" << endl;
        else
            cout << dist[i] << endl;
    }
}

int main() {
    int n = 5; // 节点数
    vector<vector<pair<int, int>>> graph(n);

    // 添加边：{u, v, weight}
    graph[0].push_back({1, 10});
    graph[0].push_back({3, 5});
    graph[1].push_back({2, 1});
    graph[1].push_back({3, 2});
    graph[2].push_back({4, 4});
    graph[3].push_back({1, 3});
    graph[3].push_back({2, 9});
    graph[3].push_back({4, 2});
    graph[4].push_back({0, 7});
    graph[4].push_back({2, 6});

    dijkstra(graph, 0); // 从节点0开始

    return 0;
}