#include
using namespace std;
int main() {
int n,m;
cin>>n>>m;
int a[1000][1000],i,j;
for (i=0;i<n;i++){
for (j=0;j<n;j++){
cin>> a[i][j];
}
}
for (j=0;j<m;j++){
if (j%2==0){
for (i=0;i<n;i++){
cout<<a[i][j]<<", “;
}
}
else {
for (i=n-1;i>=0;i–){
cout<<a[i][j]<<”, ";
}
}
}
cout<<"END";
return 0;
}
no test case is passing with this code but output is coming out correct