Cod sursa(job #2668866)

Utilizator valentinchipuc123Valentin Chipuc valentinchipuc123 Data 5 noiembrie 2020 16:59:50
Problema Algoritmul lui Dijkstra Scor 90
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.12 kb
#include <iostream>
#include <algorithm>
#include <vector>
#include <fstream>
#include <set>

using namespace std;

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

int n,m,dp[50005];
bool fost[50005];
vector< pair<int,int> > vecini[300005];
set< pair<int,int> > q;

int main()
{
    f>>n>>m;
    for(int i=1; i<=m; i++)
    {
        int x,y,z;
        f>>x>>y>>z;
        vecini[x].push_back( make_pair(y,z) );
    }
    for(int i=1; i<=n; i++)
        dp[i]=10000000;
    dp[1]=0;
    fost[1]=1;

    q.insert( make_pair(0,1) );

    while( !q.empty() )
    {
        int nod=q.begin()->second;
        q.erase( q.begin() );

        for(int i=0; i<vecini[nod].size(); i++)
        {
            int x=vecini[nod][i].first;
            int cost=vecini[nod][i].second;

            if( dp[x]>dp[nod]+cost )
            {
                q.erase( make_pair(dp[x],x) );
                dp[x]=dp[nod]+cost;
                q.insert( make_pair(dp[x],x) );
            }
        }

    }
    for(int i=2; i<=n; i++)
        if(dp[i]==10000000) g<<'0'<<' ';
        else g<<dp[i]<<' ';
}