Cod sursa(job #2165553)

Utilizator ARobertAntohi Robert ARobert Data 13 martie 2018 12:38:43
Problema Algoritmul lui Dijkstra Scor 0
Compilator cpp Status done
Runda Arhiva educationala Marime 1.07 kb
#include <bits/stdc++.h>
#define MA 2147483647
using namespace std;

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

int m,n,a,b,c,viz[50001],dist[50001],tot;
vector<pair<int,int> > v[50001];
priority_queue<pair<int,int> > p;

int main()
{
    fin>>n>>m;
    tot=n;
    for (int i=1;i<=m;i++)
    {
        fin>>a>>b>>c;
        v[a].push_back(make_pair(b,c));
    }
    for (int i=1;i<=n;i++)
        dist[i]=MA;
    dist[1]=0;
    p.push(make_pair(0,1));
    while (tot>0)
    {
        auto t=p.top();
        p.pop();
        if (viz[t.second]==0)
        {
            tot--;
            viz[t.second]=1;
            for (auto vec:v[t.second])
            {
                if (-t.first+vec.second<dist[vec.first])
                {
                    dist[vec.first]=-t.first+vec.second;
                    p.push(make_pair(-dist[vec.first], vec.first));
                }
            }
        }
    }
    for (int i=2;i<=n;i++)
        if (dist[i]!=MA)
        fout<<dist[i]<<" ";
    else fout<<0<<" ";
    return 0;
}