Palindrom clasa Joi

#include <iostream>

using namespace std;

int main()
{

    int a[100][100],n,m,i,j,nr=0,cop;
    cout<<"n= ";cin>>n;
    cout<<"m= ";cin>>m;
    for (i=1;i<=n;i++)
    for (j=1;j<=m;j++)
    {
        cout<<"a["<<i<<"]["<<j<<"]= ";
        cin>>a[i][j];
        cop=a[i][j];
        while (cop)
        {nr=nr*10+cop%10;
        cop=cop/10;
        }
        if (nr==a[i][j])
        a[i][j]=a[i][j];
        else
        a[i][j]=0;
        nr=0;

    }
    for (i=1;i<=n;i++)
    {for (j=1;j<=m;j++)
    cout<<a[i][j]<<" ";
    cout<<'\n';
    }

    return 0;
}

// Vineri metode de sortare vectori + test matrice.