Cod sursa(job #3271613)

Utilizator GILIEDAVIDGilie David Florin GILIEDAVID Data 26 ianuarie 2025 18:12:31
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.03 kb
#include <iostream>
#include <fstream>
#include <queue>
#include <vector>
#define inf 2e9
#define per pair<int,int>
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
priority_queue<per,vector<per>,greater<per> >h;
vector<per> v[50005];
int d[50005],i,n,m,x,y,z;
void dijkstra(int k)
{
    int i,t,u,c;
    for(i=1;i<=n;i++)
        d[i]=inf;
    d[k]=0;
    h.push({0,k});
    while(!h.empty())
    {
        t=h.top().second;
        c=h.top().first;
        h.pop();
        if(d[t]!=c) continue;
        for(i=0;i<v[t].size();i++)
        {
            u=v[t][i].second;
            c=v[t][i].first;
            if(d[t]+c<d[u])
            {
                d[u]=d[t]+c;
                h.push({d[u],u});
            }
        }
    }
}
int main()
{
    f>>n>>m;
    for(i=1;i<=m;i++)
    {
        f>>x>>y>>z;
        v[x].push_back({z,y});
    }
    dijkstra(1);
    for(i=2;i<=n;i++)
        if(d[i]==inf) g<<0<<" ";
        else
            g<<d[i]<<" ";
    return 0;
}