What is wrong in my code

#1

it doesn’t pass any of the test cases

#include
using namespace std;
int main()
{ int M,N;
cin>>M>>N;
int row,col;
int arr[M][N]={0};
int val=1;
for(row=0;row<=M-1;row++)
{
for( col=0;col<=N-1;col++)
{
arr[row][col]=val;
val=val+1;
cout<<arr[row][col]<<" ";
}
cout<<endl;
}

for( col=0;col<=N-1;col++)
{
    if(col%2==0)
    {
        for(row=0;row<=M-1;row++)
        {
            cout<<arr[row][col]<<",";
        }
    }
    else{
        for(row=M-1;row>=0;row--)
        {
            cout<<arr[row][col]<<",";
        }
    }
    
}
cout<<"END";
return 0;

}

#2

hello @deepteaman
check now->

#3

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