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- #include <iostream>
- #include <vector>
- #include <algorithm>
- #include <queue>
- using namespace std;
- struct node {
- int idx;
- int cost;
- node(){}
- node(int _idx, int _cost) {
- idx = _idx;
- cost = _cost;
- }
- bool operator < (const node &tmp) const {
- return cost > tmp.cost;
- }
- };
- int main() {
- int n, m;
- cin >> n >> m;
- vector<pair<int, int> > graph[n + 1];
- 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));
- }
- int S, E;
- cin >> S >> E;
- priority_queue<node> pq;
- pq.push(node(S, 0));
- vector<bool> visited(n + 1, false);
- vector<int> distance(n + 1, 2e9);
- distance[S] = 0; // start
- while(!pq.empty()) {
- node current_node = pq.top();
- pq.pop();
- visited[current_node.idx] = true;
- for(int i = 0; i < graph[current_node.idx].size(); i++) {
- int sosed = graph[current_node.idx][i].first;
- int rebro = graph[current_node.idx][i].second;
- if(!visited[sosed] and current_node.cost + rebro < distance[sosed]) {
- pq.push(node(sosed, current_node.cost + rebro));
- distance[sosed] = current_node.cost + rebro;
- }
- }
- }
- cout << distance[E] << endl; // end
- return 0;
- }
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