Cod sursa(job #3355539)

Utilizator flv.ghGherasim Flavius-Sebastian flv.gh Data 22 mai 2026 23:46:20
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.27 kb
#include <fstream>
#include <vector>
#include <queue>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
vector<pair<int,int>>adj[500002];
int distante[500002];
int tata[500002];
void dijsktra(int start,int n)
{
    for(int i=1; i<=n; i++)
    {
        distante[i]=1000000000;
        tata[i]=-1;
    }
    distante[start]=0;
    priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>>pq;
    pq.push({0,start});
    while(!pq.empty())
    {
        int distanta=pq.top().first;
        int nod=pq.top().second;
        pq.pop();
        if(distanta>distante[nod])
        {
            continue;
        }
        for(pair<int,int> muchie:adj[nod])
        {
            int vecin=muchie.first;
            int dist=muchie.second;
            if(distante[nod]+dist<distante[vecin])
            {
                distante[vecin]=distante[nod]+dist;
                tata[vecin]=nod;
                pq.push({distante[vecin],vecin});
            }
        }
    }
}
int main()
{
int n,m;
f>>n>>m;
for(int i=1; i<=m; i++)
    {
    int x,y,z;
    f>>x>>y>>z;
    adj[x].push_back({y,z});
    }
dijsktra(1,n);
for(int i=2; i<=n; i++)
{
    if(distante[i]==1000000000)
    {
        g<<0<<" ";
    }
    else
    {
    g<<distante[i]<<" ";
    }
}
return 0;
}