Cod sursa(job #2544214)

Utilizator AndreiDeltaBalanici Andrei Daniel AndreiDelta Data 11 februarie 2020 20:50:36
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.12 kb
#include <bits/stdc++.h>
#define Dim 50001
#define oo 1e9 + 1
using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int N,M,a,b,c,D[Dim];
int viz[Dim];

typedef pair<int,int> pi;

vector < pi > V[Dim];

void Dijkstra()
{
    queue < int > qu;
    qu.push(1);
    D[1]=0;
    viz[1]=1;

    while(!qu.empty())
    {
        int nod=qu.front();
        qu.pop();
        viz[nod]=0;

        for(unsigned int i=0;i<V[nod].size();i++)
        {
            int vecin=V[nod][i].first;
            int cost=V[nod][i].second;

            if( D[nod] + cost < D[vecin] )
            {
                D[vecin]=D[nod]+cost;
                if(!viz[vecin])
                {
                    viz[vecin]=1;
                    qu.push(vecin);
                }
            }
        }
    }

}

int main()
{
    f>>N>>M;
    for(int i=1;i<=M;i++)
    {
        f>>a>>b>>c;
        V[a].push_back({b,c});
    }
    for(int i=1;i<=N;i++)
    D[i]=oo;

    Dijkstra();
    for(int i=2;i<=N;i++)
    if( D[i] == oo ) g<<0<<' ';
    else g<<D[i]<<' ';


    return 0;
}