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- #include <iostream>
- #include <vector>
- #include <queue>
- using namespace std;
- const int maxn = 1e5 + 10;
- const int INF = 2e9;
- vector<pair<int, int>> graph[maxn];
- int n, m;
- struct node {
- int idx, cost;
- node () {}
- node(int _idx, int _cost) {
- idx = _idx;
- cost = _cost;
- }
- bool operator < (const node &tmp) const {
- return cost > tmp.cost;
- }
- };
- void dijkstra(int start_node) {
- vector<int> distance(n, INF);
- vector<bool> visited(n, false);
- distance[start_node] = 0;
- priority_queue<node> pq;
- pq.push(node(start_node, 0));
- while(!pq.empty()) {
- node c = pq.top();
- pq.pop();
- if(visited[c.idx]) {
- continue;
- }
- visited[c.idx] = true;
- for(int i = 0; i < (int) graph[c.idx].size(); i++) {
- int neighbour = graph[c.idx][i].first;
- int weight = graph[c.idx][i].second;
- if(!visited[neighbour] and c.cost + weight < distance[neighbour]) {
- pq.push(node(neighbour, c.cost + weight));
- distance[neighbour] = c.cost + weight;
- }
- }
- }
- for(int i = 0; i < n; i++) {
- cout << distance[i] << " ";
- }
- }
- int main() {
- cin >> n >> m;
- for(int i = 0; i < m; i++) {
- int a, b, c;
- cin >> a >> b >> c;
- graph[a].push_back(make_pair(b, c));
- graph[b].push_back(make_pair(a, c));
- }
- dijkstra(0);
- return 0;
- }
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