Cod sursă (job #252336)

#include<fstream>
using namespace std;
ifstream f("fotografie.in");
ofstream g("fotografie.out");
int n,m,a[101][101],nr;
int dx[8]={-1,-1,-1,0,1,1,1,0};
int dy[8]={-1,0,1,1,1,1,-1,-1};
void citire()
{
    f>>n>>m;
    for(int i=1;i<=n;++i)
        for(int j=1;j<=n;++j)
        f>>a[i][j];
}
int verif(int x,int y)
{
    if(x> 0 and x<=n and y>0 and y<=m and a[x][y]==-1)
        return 1; return 0;
}
void btr(int x,int y,int k)
{
    for(int i=0;i<8;++i)
    {
        int x1=x+dx[i];
        int y1=y+dy[i];
        if(verif(x1,y1))
        {
            a[x1][y1]=k;
            btr(x1,y1,k);
        }
    }
}
int main()
{
    citire();
    for(int i=1;i<=n;++i)
        for(int j=1;j<=m;++j)
        if( a[i][j]==-1)
    {
        nr++;
        btr(i,j,nr);
    }
    g<<nr;
    g.close();
    return 0;
}