de quy dau vs de quy duoi

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

#define ll long long

void printFromLeft (ll n){
    if ( n==0 ) return ;
    printFromLeft(n/10);
    int r=n%10;
    cout<<r<<" ";
}

void printFromRight(ll n){
    if ( n==0 ) return ;
    int r= n%10;
    cout<<r<<" ";
    printFromRight(n/10);
}

int main() {
    ll n;
    cin >> n;
    printFromLeft(n);
    cout<<endl;
    printFromRight(n);

    /* Enter your code here. Read input from STDIN. Print output to STDOUT */
    return 0;
}