Cod sursa(job #2020455)

Utilizator mirunafrancescaMiruna mirunafrancesca Data 10 septembrie 2017 13:29:56
Problema BFS - Parcurgere in latime Scor 70
Compilator cpp Status done
Runda Arhiva educationala Marime 1.01 kb
#include <iostream>
#include <stdio.h>
#include <queue>
using namespace std;

#define NMAX 100000
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 && g[s][j]!=s)
           {
               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);
        g[x].push_back(y);
    }

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






    return 0;
}