Cod sursa(job #2681296)

Utilizator rareshinnhoMiroiu Rares rareshinnho Data 5 decembrie 2020 11:24:29
Problema Algoritmul lui Dijkstra Scor 10
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.19 kb
#include <bits/stdc++.h>

using namespace std;

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

const int inf=(1<<30);
int n,m;
int d[50001];
bool viz[50001];

vector<pair<int,int>> G[50001];
priority_queue<int, vector<int>, greater<int> > h;

void dijkstra(int nodstart)
{
    for(int i=1;i<=n;i++)
        d[i]=inf;
    d[nodstart]=0;
    h.push(nodstart);
    viz[nodstart]=1;
    while(!h.empty())
    {
        int nod=h.top();
        h.pop();
        viz[nod]=1;
        for(int i=0;i<G[nod].size();i++)
        {
            int vecin=G[nod][i].first;
            int cost=G[nod][i].second;
            if(d[nod]+cost<d[vecin])
            {
                d[vecin]=d[nod]+cost;
                if(viz[vecin]==0)
                {
                    h.push(vecin);
                    viz[vecin]=1;
                }
            }
        }
    }
}

int main()
{
    int a,b,c;
    f>>n>>m;
    for(int i=1;i<=m;i++)
    {
        f>>a>>b>>c;
        G[a].push_back(make_pair(b,c));
    }
    dijkstra(1);
    for(int i=2;i<=n;i++)
    {
        if(d[i]!=inf)g<<d[i]<<' ';
        else
            g<<0<<' ';
    }


    return 0;
}