Cod sursa(job #2111343)

Utilizator dumitru123Patularu Mihai dumitru123 Data 21 ianuarie 2018 21:29:50
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.81 kb
#include <bits/stdc++.h>
using namespace std;
ifstream f("bfs.in");
ofstream g("bfs.out");
#define nmax 100003
int n,m,x,y,start;
int viz[nmax];
vector < int > v[nmax];
queue < int > coada;
void BFS(int nod)
{
    coada.push(nod);
    viz[nod]=0;
    while(!coada.empty())
    {
        nod=coada.front();
        coada.pop();
        for(vector < int > ::iterator it=v[nod].begin();it!=v[nod].end();it++)
            if(viz[*it]==-1)
            {
                viz[*it]=viz[nod]+1;
                coada.push(*it);
            }
    }
}
int main()
{
    f>>n>>m>>start;
    for(int i=1; i<=m; i++)
    {
        f>>x>>y;
        v[x].push_back(y);
    }
    for(int i=1;i<=n;i++)
        viz[i]=-1;
    BFS(start);
    for(int i=1;i<=n;i++)
        g<<viz[i]<<" ";
    return 0;
}