Cod sursa(job #2504909)

Utilizator RAZVAN_NISTORNistor Razvan RAZVAN_NISTOR Data 5 decembrie 2019 19:02:53
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.1 kb
#include <bits/stdc++.h>

using namespace std;
ifstream f("dijkstra.in");
ofstream g("dijkstra.out");
int n,p,m;
const int INF=10000000;
int d[50001],viz[50001];
vector<pair<int,int> > v[50001];
void init();
int cauta_min();
void Dijkstra();

int main()
{
    f>>n>>m;
    p=1;
    int node1,node2,cost;
    for(int i=1;i<=m;++i)
    {
        f>>node1>>node2>>cost;
        v[node1].push_back(make_pair(node2,cost));
    }
    init();
    Dijkstra();
    for(int i=2;i<=n;i++)
        if(d[i]==INF)
            g<<"0 ";
        else
            g<<d[i]<<" ";
    return 0;
}
void init()
{
    for(int i=1;i<=n;i++)
       {
          d[i]=INF;
       }
    d[p]=0;
}
void Dijkstra()
{
    priority_queue< pair<int,int> > q;
    q.push({0,p});
    while(!q.empty())
    {
        int val=-q.top().first;
        int nod=q.top().second;
        q.pop();
        for(auto it:v[nod])
        {
            if(val+it.second<d[it.first])
            {
                d[it.first]=val+it.second;
                q.push({-d[it.first],it.first});
            }
        }
    }
}