Cod sursa(job #2560191)

Utilizator xXoctavianXxStanescu Matei Octavian xXoctavianXx Data 27 februarie 2020 20:16:25
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.76 kb
#include <bits/stdc++.h>

using namespace std;

ifstream fin("bfs.in");
ofstream fout("bfs.out");

const int nmax=100002;

int n,m,s,x,y;
queue<int> q;
vector<int> v[nmax];
int d[nmax];

int main()
{
    fin>>n>>m>>s;
    for(int i=0; i<m; i++)
    {
        fin>>x>>y;
        v[x].push_back(y);
    }
    for(int i=1; i<=n; i++) d[i]=-1;
    q.push(s);
    d[s]=0;
    while(!q.empty())
    {
        int pos=q.front();
        q.pop();
        for(int i=0; i<v[pos].size(); i++)
        {
            int pi=v[pos][i];
            if(d[pi]>d[pos] + 1 || d[pi]==-1)
            {
                d[pi]=d[pos]+1;
                q.push(pi);
            }
        }
    }
    for(int i=1; i<=n; i++) fout<<d[i]<<" ";
    return 0;
}