Cod sursa(job #1556712)

Utilizator mihai.constantinConstantin Mihai mihai.constantin Data 25 decembrie 2015 18:43:35
Problema BFS - Parcurgere in latime Scor 50
Compilator cpp Status done
Runda Arhiva educationala Marime 1.24 kb
#include <iostream>
#include <cstdio>
using namespace std;

const int dmax = 1000;

int N, M, S;

int lst[dmax+1];
int vf[dmax*(dmax-1)/2 + 1];
int urm[dmax*(dmax-1)/2 + 1];
int nr;

int C[dmax+1];
int viz[dmax+1];

void adauga(int x, int y)
{
    //ADAUG IN LISTA LUI x PE y

    nr++;
    vf[nr] = y;
    urm[nr] = lst[x];
    lst[x] = nr;
}

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

    int i, x, y, first, last, p;

    scanf("%d %d %d", &N, &M, &S);

    for(i = 1; i <= M; i++)
    {
        scanf("%d %d", &x, &y);

        adauga(x,y); //GRAF ORIENTAT
    }

    for(i = 1; i <= N; i++) viz[i] = -1;

    first = last = 1;

    //INSEREZ IN COADA NODUL S CU COSTUL 0
    C[1] = S; viz[S] = 0;

    while(first <= last)
    {
        x = C[first];

        //PARCURGEM LISTA VECINILOR y AI LUI x

        p = lst[x];

        while(p)
        {
            y = vf[p];

            if(viz[y] == -1)
            {
                last++;
                C[last] = y;
                viz[y] = 1 + viz[x];
            }

            p = urm[p];
        }

        first++;
    }

    for(i = 1; i <= N; i++) printf("%d ", viz[i]);

    return 0;
}