Nu aveti permisiuni pentru a descarca fisierul grader_test21.in

Cod sursa(job #2477896)

Utilizator andrei_044Andrei Constantin andrei_044 Data 21 octombrie 2019 11:54:36
Problema Algoritmul lui Dijkstra Scor 20
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 1.08 kb
#include<bits/stdc++.h>
#define INF 1 << 30
#define M 50003
using namespace std;
ifstream fin("dijkstra.in");
ofstream fout("dijkstra.out");

int n,m,dist[M];
vector<pair <int,int> >lista[M];
priority_queue<pair <int,int> >q;
bool viz[M];

void dijkstra()
{
    for(int i=1;i<=n;i++)
        dist[i]=INF;
    q.push({0,1});
    dist[1]=0;

    while(!q.empty())
    {
        int u=q.top().second;
        q.pop();
        if(viz[u]==true)
            continue;
        viz[u]=true;

        for(auto x:lista[u])
        {
            int nod=x.second;
            int d=x.first;
            if(dist[u]+d<dist[nod])
            {
                dist[nod]=dist[u]+d;
                q.push({dist[nod],nod});
            }

        }
    }


}

int main()
{
    fin>>n>>m;
    for(int i=1;i<=m;i++)
    {
        int a,b,d;
        fin>>a>>b>>d;
        lista[a].push_back({d,b});
    }
    dijkstra();
    for(int i=2;i<=n;i++)
    {
        if(viz[i])
            fout<<dist[i]<<' ';
        else
            fout<<0<<' ';
    }
    return 0;
}