Cod sursa(job #2916775)

Utilizator cincadavidCinca David Andrei cincadavid Data 1 august 2022 13:57:54
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.82 kb
#include <fstream>
#include <vector>
#include <algorithm>
#include <queue>

using namespace std;

ifstream cin("bfs.in");
ofstream cout("bfs.out");

vector<int>v[100001];
int visit[100001];
int s;

void BFS()
{
    queue<int>q;
    q.push(s);
    while(!q.empty())
    {
        int top=q.front();
        q.pop();
        for(int i=0;i<v[top].size();i++)
        {
            if(visit[v[top][i]]==0)
            {
                visit[v[top][i]]=visit[top]+1;
                q.push(v[top][i]);
            }
        }
    }
}

int main()
{
    int n,m;
    cin>>n>>m>>s;
    visit[s]=1;
    int x,y;
    for(int i=0;i<m;i++)
    {
        cin>>x>>y;
        v[x].push_back(y);
    }
    BFS();
    for(int i=1;i<=n;i++)
    {
        cout<<visit[i]-1<<" ";
    }

    return 0;
}