Cod sursa(job #2998755)

Utilizator MihiBluBalau Mihai MihiBlu Data 9 martie 2023 22:40:37
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.21 kb
#include <fstream>
#include <vector>
#include <climits>
#include <queue>
using namespace std;

ifstream f("dijkstra.in");
ofstream g("dijkstra.out");

bool viz[50005];
int n, m;
int d[50005];
priority_queue <pair <int, int> > q;
vector <pair <int, int> > v[50005];

int main()
{
    f>>n>>m;
    for(int i=0; i<m; i++)
    {
        int x, y, c;
        f>>x>>y>>c;
        v[x].push_back(make_pair(y, c));
    }
    for(int i=1; i<=n; i++)
        d[i]=INT_MAX;
    d[1]=0;
    q.push(make_pair(0, 1));
    while(!q.empty())
    {
        int nod=q.top().second;
        int val=-q.top().first;
        q.pop();
        if(viz[nod])
            continue;
        viz[nod]=1;
        for(int i=0; i<v[nod].size(); i++)
        {
            int cost=v[nod][i].second;
            int vecin=v[nod][i].first;
            if(!viz[vecin])
            {
                if(val+cost < d[vecin])
                {
                    d[vecin]=val+cost;
                    q.push(make_pair(-val-cost, vecin));
                }
            }
        }
    }
    for(int i=2; i<=n; i++)
        if(d[i]!=INT_MAX)
            g<<d[i]<<" ";
        else
            g<<0<<" ";
    return 0;
}