Cod sursa(job #2020457)

Utilizator mirunafrancescaMiruna mirunafrancesca Data 10 septembrie 2017 13:37:01
Problema BFS - Parcurgere in latime Scor 100
Compilator cpp Status done
Runda Arhiva educationala Marime 0.93 kb
#include <iostream>
#include <stdio.h>
#include <queue>
using namespace std;

#define NMAX 100005
vector <int> g[NMAX];
queue <int> q;
int c[NMAX];

void functie(int d)
{
    q.push(d);
    int s;

    while(!(q.empty()))
   {
        s=q.front();
        q.pop();
        for(int j=0; j<g[s].size(); j++)
        {
            if(c[g[s][j]]==0)
           {
               q.push(g[s][j]);
               c[g[s][j]]=c[s]+1;
           }
        }
   }
}

int main()
{
    freopen("bfs.in", "r", stdin);
    freopen("bfs.out", "w", stdout);

    int n, m, s, x, y;
    scanf("%d %d %d \n", &n, &m, &s);

    for(int i=1; i<=m; i++)
    {
        scanf("%d %d \n", &x, &y);
        if(y!=x)
         g[x].push_back(y);
    }

    functie(s);
    c[s]=0;
    for(int i=1; i<=n; i++)
     if(c[i]==0 && i!=s)
        printf("%d ", -1);
     else
        printf("%d ", c[i]);






    return 0;
}