Cod sursa(job #2563724)

Utilizator AndiAndi39Sabo Andrei Claudiu AndiAndi39 Data 1 martie 2020 13:48:04
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.93 kb
#include<iostream>
#include<fstream>
#include<vector>
#include<queue>
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
vector<int>g[1005];
int dist[1005];
int n,m,start;
queue<int>q;
void bfs()
{
    int nod,vecin;
    while(q.empty()==0)
    {
        nod=q.front();
        q.pop();
        for(int i=0;i<g[nod].size();i++)
        {
            vecin=g[nod][i];
            if(dist[vecin]==-1)
            {
                q.push(vecin);
                dist[vecin]=dist[nod]+1;
            }
        }
    }
}
int main ()
{
    fin>>n>>m>>start;
    for(int i=1;i<=m;i++)
    {
        int x,y;
        fin>>x>>y;
        g[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
    {
        dist[i]=-1;
    }
    dist[start]=0;
    q.push(start);
    bfs();
    for(int i=1;i<=n;i++)
    {
        fout<<dist[i]<<" ";
    }
    fin.close();
    fout.close();
    return 0;
}