Cod sursa(job #2808027)

Utilizator rimihaiMihai Radu-Ioan rimihai Data 24 noiembrie 2021 14:40:05
Problema Algoritmul lui Dijkstra Scor 50
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.14 kb
#include <bits/stdc++.h>

using namespace std;

#define INFINIT 0x3f3f3f3f

ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

vector<pair<int,int>> g[50005];
bool viz[50005];
int d[50005];

void dijkstra(int startNod)
{
    d[startNod]=0;
    priority_queue<pair<int,int>> q;
    q.push({0,startNod});
    while(!q.empty())
    {
        int nod=q.top().second;
        q.pop();
        for(auto vecin : g[nod])
        {
            //cout<<"VECIN:"<<vecin.first<<" "<<vecin.second<<endl;
            if(d[nod]+vecin.second<d[vecin.first])
            {
                d[vecin.first]=d[nod]+vecin.second;
                q.push({d[vecin.first],vecin.first});
                //cout<<d[vecin.first]<<" "<<vecin.first<<endl;
            }
        }
    }
}

int main()
{
    int n,m;
    fin>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int a,b,cost;
        fin>>a>>b>>cost;
        g[a].push_back({b,cost});
    }

    for(int i=1; i<=n; i++)
        d[i]=INFINIT;

    dijkstra(1);

    for(int i=2; i<=n; i++)
        if(d[i]!=INFINIT)fout<<d[i]<<" ";
        else fout<<0<<" ";
    return 0;
}