Smartphone1

#include <fstream>
using namespace std;
int a[3][3]={{1,2,3},{4,5,6},{7,8,9}},ultimacifra;

bool corespunde(int cifra)
{
    int i,j;
    switch(cifra)
    {
        case 1: i=0;j=0;break;
        case 2: i=0;j=1;break;
        case 3: i=0;j=2;break;
        case 4: i=1;j=0;break;
        case 5: i=1;j=1;break;
        case 6: i=1;j=2;break;
        case 7: i=2;j=0;break;
        case 8: i=2;j=1;break;
        case 9: i=2;j=2;break;
    }
    if(a[i-1][j]==ultimacifra&&i) /// N
        return true;
    if(a[i+1][j]==ultimacifra&&i<2) /// S
        return true;
    if(a[i][j-1]==ultimacifra&&j) /// V
        return true;
    if(a[i][j+1]==ultimacifra&&j<2) /// E
        return true;
    if(a[i-1][j-1]==ultimacifra&&i&&j) /// N-V
        return true;
    if(a[i+1][j+1]==ultimacifra&&i<2&&j<2) /// S-E
        return true;
    if(a[i+1][j-1]==ultimacifra&&i<2&&j) /// S-V
        return true;
    if(a[i-1][j+1]==ultimacifra&&i&&j<2) /// N-E
        return true;
    return false;
}

int main()
{
    int n;
    ifstream f("smartphone1.in");
    f>>n;
    int x,c=false;
    while(n--)
    {
        f>>x;
        bool debloc=true;
        int cifra=x%10;
        ultimacifra=cifra;
        x/=10;
        while(x)
        {
            cifra=x%10;
            if(cifra==ultimacifra)
            {
                debloc=false;
                break;
            }
            if(!corespunde(cifra))
            {
                debloc=false;
                break;
            }
            ultimacifra=cifra;
            x/=10;
        }
        if(debloc)
            ++c;
    }
    ofstream g("smartphone1.out");
    g<<c<<'\n';
    return false;
}