Cod sursa(job #2372507)

Utilizator victorobamavictor olaru victorobama Data 7 martie 2019 09:35:56
Problema Algoritmul lui Dijkstra Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.16 kb
#include <fstream>
#include<vector>
#include<set>
#include<cstring>

using namespace std;

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

int a,b,c,dist[50005],nod,cost,to,n,m,i;
vector <pair <int, int > > v[50005];

set <pair <int,int > > h;

vector <pair <int, int > > ::iterator it;


const int INF=0x3f3f3f3f;

int main()
{
    f>>n>>m;
    for(i=1;i<=m;i++)
    {
        f>>a>>b>>c;
        v[a].push_back(make_pair(b,c));
    }
    for(i=1;i<=n;i++)
        dist[i]=INF;
    dist[1]=0;
    h.insert(make_pair(0,1));
    while(!h.empty())
    {
        nod=h.begin()->second;

        h.erase(h.begin());

        for(it=v[nod].begin();it!=v[nod].end();++it)
        {
            to=it->first;
            cost=it->second;
            if(dist[nod]+cost < dist[to])
            {
               if(dist[to]!= INF) h.erase(h.find(make_pair(dist[to],to)));
                dist[to] = dist[nod] + cost;
                h.insert(make_pair(dist[to],to));
            }
        }
    }
    for(i=2;i<=n;i++)

    {
    if(dist[i]!=INF)g<<dist[i]<<' ';
        else g<<0<<' ';
    }
        g<<'\n';

    return 0;
}