Spirala

#include <fstream>
#include <cstdlib>
using namespace std;
ifstream fin ("spirala.in");
ofstream fout ("spirala.out");
int n,m,j,i,k,x,y,ok,ult,ult1,d;
int v[101][101];
int main()
{
    fin>>n>>m;
    ult1=n;
    for (i=1; i<=n; i++)
    {
        for (j=1; j<=m; j++)
            fin>>v[i][j];
    }
    for (k=1,i=1; k<=n; k+=2)
    {
        i=ult+1;
        for (j=1; j<m-1; j++)
        {
            if (abs (v[i][j]-v[i][j+1])!=abs (v[i][j+1]-v[i][j+2]))
            {
               x=v[i][j];
               y=v[i][j+1];
                ok=1;
                break;
            }
        }
        if (ok==1)
            break;
            d++;
        ult=i;
        i=ult1-1;
        for (j=n; j>2; j--)
        {
            if (abs (v[i][j]-v[i][j-1])!=abs (v[i][j-1]-v[i][j-2]))
            {
                x=v[i][j];
                y=v[i][j-1];
                ok=1;
                break;
            }
        }
        d++;
        if (ok==1)
            break;
        ult1=i;
    }
    if (d<2)
    {
        fout<<"NU"<<'\n';
    fout<<x<<' '<<y;}
    else
    {
        fout<<"DA"<<'\n';
        fout<<y;
    }
    fout.close();
    return 0;
}