Cod sursa(job #2870429)

Utilizator AndreiP25Prusacov Andrei AndreiP25 Data 12 martie 2022 12:38:05
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.75 kb
#include <bits/stdc++.h>
using namespace std;

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

vector<int>A[100001];
queue<int>Q;
int n,m,s, dist[100001], viz[100001];

void bfs()
{
    for(int i=1; i<=n; i++)
        dist[i]=-1;
    dist[s]=0;
    Q.push(s);
    while(!Q.empty())
    {

        int a=Q.front();
        Q.pop();
        for(int u:A[a])
        {
            if(dist[u]==-1)
            {
                dist[u]=dist[a]+1;
                Q.push(u);
            }
        }
    }
}

int main()
{
    fin>>n>>m>>s;
    for(int i=1; i<=m; i++)
    {
        int a,b;
        fin>>a>>b;
        A[a].push_back(b);
    }
    bfs();
    for(int i=1; i<=n; i++)
        fout<<dist[i]<<" ";

    return 0;
}