Cod sursa(job #2294353)

Utilizator mjmilan11Mujdar Milan mjmilan11 Data 2 decembrie 2018 12:15:15
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.87 kb
#include <bits/stdc++.h>

using namespace std;

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

const int NMAX = 100005;

vector <int> v[NMAX];
int dist[NMAX];

void bfs(int start)
{
    memset(dist,-1,sizeof(dist));
    queue<int> q;
    q.push(start);
    dist[start]=0;
    while(!q.empty())
    {
        int nod=q.front();
        q.pop();
        for(int i=0;i<v[nod].size();i++)
        {
            int vecin=v[nod][i];
            if(dist[vecin]==-1)
            {
                dist[vecin]=dist[nod]+1;
                q.push(vecin);
            }
        }
    }
}


int main()
{
    int n,m,s;
    fin >> n >> m >> s;
    int x,y;
    for(int i=1;i<=m;i++)
    {
        fin >> x >> y;
        v[x].push_back(y);
    }
    bfs(s);
    for(int i=1;i<=n;i++)
    {
        fout << dist[i] << ' ';
    }
    return 0;
}