Cod sursa(job #2172596)

Utilizator andrei.sasaAndrei SaSa andrei.sasa Data 15 martie 2018 17:05:55
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 1.43 kb
#include <iostream>
#include <fstream>
#include <vector>
#include <queue>
#define inf 0x3f3f3f3f

using namespace std;

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

struct muchie
{
    int nod,dist;
    bool operator<(const muchie &altu)const
    {
        return dist>altu.dist;
    }
};

vector <muchie> G[50005];
int n,m,d[50005],viz[50005];

void Dijkstra(int x)
{
    priority_queue <muchie> q;
    for(int i=1;i<=n;i++)
        d[i]=inf;
    d[x]=0;
    muchie nou;
    nou.nod=x;
    nou.dist=0;
    q.push(nou);
    while(!q.empty())
    {
        nou=q.top();
        q.pop();
        if(!viz[nou.nod])
        {
            viz[nou.nod]=1;
            for(int i=0;i<G[nou.nod].size();i++)
                if(!viz[G[nou.nod][i].nod] && d[G[nou.nod][i].nod]>d[nou.nod]+G[nou.nod][i].dist)
            {
                muchie nou1;
                nou1.nod=G[nou.nod][i].nod;
                nou1.dist=d[nou.nod]+G[nou.nod][i].dist;
                d[G[nou.nod][i].nod]=d[nou.nod]+G[nou.nod][i].dist;
                q.push(nou1);
            }
        }
    }
    for(int i=2;i<=n;i++)
        if(d[i]==inf) g<<0<<' ';
        else g<<d[i]<<' ';
}

int main()
{
    f>>n>>m;
    while(m--)
    {
        int a,b,c;
        f>>a>>b>>c;
        muchie nou;
        nou.nod=b;
        nou.dist=c;
        G[a].push_back(nou);
    }
    Dijkstra(1);
    g.close();
    return 0;
}