Why it show wrong answer....!

#1

In my dev c++ compiler, it shows the same output. why it shows wrong here.

here is my code.

int main()
{
int a,b, arr[100][100];
cin>>a>>b;

for(int i=0; i<a; i++){
	for(int j=0; j<b; j++){
		cin>>arr[i][j];
	}
}

for(int j=0; j<a; j++){
	if(j%2==0)
	{
	     for(int i=0; i<b; i++)
		 cout<<arr[i][j]<<" ";	
	}
	else
	{
		 for(int i=b-1; i>=0; i--)
		 cout<<arr[i][j]<<" ";	
	}
}
cout<<"END";

}

#2

@sonu28sharma99 your j should be iterating over column (b) and i should be iterating over rows (a). otherwise it will give you wrong answer for case where rows and column are not equal.

#3

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