Cod sursa(job #2071229)

Utilizator ioana_marinescuMarinescu Ioana ioana_marinescu Data 20 noiembrie 2017 14:56:29
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.74 kb
#include <bits/stdc++.h>
using namespace std;
const int NMAX = 100005;

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

int n, m, s, vizitat[NMAX];
vector<int> vecini[NMAX];

void bfs(int s) {
    int u;
    queue<int>q;
    q.push(s);
    vizitat[s]=0;
    while(!q.empty()) {
        u=q.front();
        q.pop();
        for(auto v: vecini[u])
        if(vizitat[v]==-1) {
            vizitat[v]=vizitat[u]+1;
            q.push(v);
        }
    }
}
int main() {
    int i, x, y;
    fin>>n>>m>>s;
    for(i=1; i<=m; i++) {
        fin>>x>>y;
        vecini[x].push_back(y);
    }
    for(int i=1; i<=n; i++)
        vizitat[i]=-1;
    bfs(s);
    for(i=1; i<=n; i++)
        fout<<vizitat[i]<<" ";
    return 0;
}