Cod sursa(job #1230598)

Utilizator roparexRoparex roparex Data 18 septembrie 2014 17:35:24
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp Status done
Runda Arhiva educationala Marime 1.12 kb
#include<fstream>
#include<vector>
#include<utility>
#include<queue>
using namespace std;
int n,m,a,b,c,d[50001];
priority_queue <pair<int,int>,vector<pair<int,int> >,greater<pair<int,int> > > q;
vector<pair<int,int> > v[50001];
int main()
{
    ifstream is("dijkstra.in");
    ofstream os("dijkstra.out");
    is>>n>>m;
    for(int i=1;i<=m;i++)
    {
        is>>a>>b>>c;
        v[a].push_back(make_pair(c,b));
    }
    for(vector<pair<int,int> >::iterator i=v[1].begin();i!=v[1].end();i++)
    {
        q.push((*i));
    }
    for(int i=1;i<=n;i++)
    d[i]=50000000;
        pair<int,int> aux;
    while(q.empty()==0)
    {
        aux=q.top();
        q.pop();
        if(d[aux.second]>aux.first&&aux.second!=1)
        {
            d[aux.second]=aux.first;
            for(vector<pair<int,int> >::iterator i=v[aux.second].begin();i!=v[aux.second].end();i++)
            {
                q.push(make_pair((*i).first+d[aux.second],(*i).second));
            }
        }
        while(d[q.top().second]<50000000&&q.empty()==0)
        q.pop();
    }
    for(int i=2;i<=n;i++)
    os<<d[i]<<' ';
}