Cod sursa(job #3336119)

Utilizator David2007mMartin David David2007m Data 24 ianuarie 2026 11:29:53
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.83 kb
#include <bits/stdc++.h>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");

typedef pair <int, int> edge;
vector <edge> vecini[50001];
priority_queue <edge, vector<edge>, greater <edge>> q;
int n,m,dist[50001];

void Djikstra (int start) {
	for(int i=1; i<=n; i++)
		dist[i]=INT_MAX;
	dist[start]=0;
	q.push({0, start});
	while(!q.empty()) {
		int d=q.top().first;
		int i=q.top().second;
		q.pop();
		if(d>dist[i]) continue;
		for(auto e : vecini[i]) {
			int w=e.first;
			int j=e.second;

			if(dist[i] + w<dist[j]) {

				dist[j]=dist[i]+w;
				q.push({dist[j],j});
			}
		}
	}
}
int main() {
	f>>n>>m;
	for(int i=0; i<m; i++) {
		int x,y,cost;
		f>>x>>y>>cost;
		vecini[x].push_back({cost,y});
	}
	Djikstra(1);
	for(int i=2; i<=n; i++)
		if(dist[i] !=INT_MAX)
			g<<dist[i]<<' ';
		else
			g<<0<<' ';

	return 0;
}