What's wrong in my approach

#1

#include
using namespace std;
int main(){
int m,n;
cin>>m>>n;
int a[m][n];
for(int i=0;i<m;i++){
for(int j=0;j<n;j++){
cin>>a[i][j];
}
}
int u=0,o=0;

while(o<n){
if(o%2==0){
	for(int i=0;i<m;i++){
		cout<<a[i][o]<<", ";
	}
	o++;
}
if(o%2==1){
	for(int i=m-1;i>=0;i--){
		cout<<a[i][o]<<", ";
	}
	o++;
}
}
cout<<" END";

}

#2

@Harshit-Jha-2364832040305354 please save your code on ide.codingblocks.com and share the link.

#3

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