Cod sursa(job #2678341)

Utilizator Gheorghita_VladGheorghita Vlad Gheorghita_Vlad Data 28 noiembrie 2020 12:01:33
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.7 kb
#include <bits/stdc++.h>

using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
vector<int> v[100005];
queue<int>q;
int n,m,x,viz[100005],a,b;
void bfs()
{
    q.push(x);
    viz[x]=1;
    while(!q.empty())
    {
        int t=q.front();
        for(int i=0; i<v[t].size(); i++)
        {
            if(!viz[v[t][i]])
            {
                viz[v[t][i]]=viz[t]+1;
                q.push(v[t][i]);
            }
        }
        q.pop();
    }
}
int main()
{
    int i;
    f>>n>>m>>x;
    for(i=1; i<=m; i++)
    {
        f>>a>>b;
        v[a].push_back(b);
    }
    bfs();
    for(i=1; i<=n; i++)
    {
        g<<viz[i]-1<<" ";
    }
    return 0;
}