Cod sursa(job #2375862)

Utilizator Razvan85Secure Razvan Razvan85 Data 8 martie 2019 12:43:41
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp-64 Status done
Runda Arhiva educationala Marime 0.68 kb
#include <bits/stdc++.h>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
vector <int> v[100001];
queue <int> q;
int n,m,a,b,nr,s,nod,c[100001];
int main()
{
    f>>n>>m>>s;
    for(int i=1;i<=m;i++)
    {
        f>>a>>b;
        v[a].push_back(b);
    }
    for(int i=1;i<=n;i++)
        c[i]=100001;
    q.push(s);
    c[s]=0;
    while(!q.empty())
    {
        nod=q.front();
        q.pop();
        for(int i=0;i<v[nod].size();i++)
            if(c[v[nod][i]]==100001)
               q.push(v[nod][i]),c[v[nod][i]]=c[nod]+1;
    }
    for(int i=1;i<=n;i++)
       if(c[i]==100001) g<<-1<<" ";
       else
        g<<c[i]<<" ";
    return 0;
}