Cod sursa(job #1794727)

Utilizator paulstepanovStepanov Paul paulstepanov Data 1 noiembrie 2016 17:58:12
Problema Algoritmul lui Dijkstra Scor 40
Compilator cpp Status done
Runda Arhiva educationala Marime 1.14 kb
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

const int Nmax=50005;
int N,M;
int D[Nmax],S[Nmax];
const int oo=2000000000;
vector <pair<int,int> > G[Nmax];

void Read()
{
    fin>>N>>M;
    for(int i=1;i<=M;++i)
    {   int x,y,c;
        fin>>x>>y>>c;
        pair<int,int>P;
        P.first=y; P.second=c;
        G[x].push_back(P);
    }
}

void Dijkstra()
{
    for(int i=1;i<=N;++i)
        D[i]=oo;
    D[1]=0;
    for(int k=1;k<=N;++k)
    {
        int Min=oo,Nod;
        for(int i=1;i<=N;++i)
            if(D[i]<Min && !S[i])
        {
            Min=D[i];
            Nod=i;
        }
        S[Nod]=1;

        for(int i=0;i<(int)G[Nod].size();++i)
        {
            int Vecin=G[Nod][i].first;
            int Cost=G[Nod][i].second;
            if(!S[Vecin])
            D[Vecin]=min(D[Vecin],D[Nod]+Cost);
        }
    }
}

void Print()
{
    for(int i=2;i<=N;i++)
        if(D[i]==oo) fout<<"0 ";
    else fout<<D[i]<<" ";
    fout<<"\n";
}

int main()
{
    Read();
    Dijkstra();
    Print();
    return 0;
}