Wave print problem

#1

#include
using namespace std;
int main()
{
int m,n;
cin>>m>>n;
int arr[10][10];
for(int row=0;row<m;row++)
{
for(int col=0;col<n;col++)
{
cin>>arr[row][col];
}
}
for(int col=0;col<n;col++)
{
if(col%2==0)
{
for(int row=0;row<m;row++)
{
cout<<arr[row][col]<<",";
}
}
else
{
for(int row=m-1;row>0;row–)
{
cout<<arr[row][col]<<",";
}
}
}
}
this is a problem of wave print .I have solved it on my compiler and it is giving correct answer but when I tried to submit this code on hacker blocks it is showing all testcases are failed

#2

@mohitshendre2609 hey ,output format dekho last me END bhi print krana hai:
All M * N integers seperated by commas with ‘END’ wriiten in the end(as shown in example).

#3

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