Cod sursa(job #3264584)

Utilizator Horia123144Musat Horia Gabriel Horia123144 Data 22 decembrie 2024 16:55:09
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.77 kb
#include <bits/stdc++.h>
#define nmax 100005
using namespace std;
ifstream fin("bfs.in");
ofstream fout("bfs.out");
int n,m,start;
vector<int>L[nmax];
int viz[nmax];
void bfs(int pas)
{
    queue<int>q;
    q.push(pas);
    viz[pas]=1;
    while(!q.empty())
    {
        pas=q.front();
        for(auto i:L[pas])
            if(viz[i]==0)
            {
                q.push(i);
                viz[i]=viz[pas]+1;
            }
        q.pop();
    }
}
int main()
{
    fin>>n>>m>>start;
    while(m--)
    {
        int x,y;
        fin>>x>>y;
        L[x].push_back(y);
    }
    bfs(start);
    for(int i=1; i<=n; i++)
    {
        if(viz[i]==0)
            fout<<-1<<' ';
        else
            fout<<viz[i]-1<<' ';
    }
    return 0;
}