I want to solve this problem :
link

#include <iostream>
using namespace std;

int luas, panjang, lebar, keliling;
int main() {
    keliling = 0;
    cin >> luas;

    for (int i = 1; i <= luas; i++)
    {
        // cout << luas;
        if (luas % i == 0)
        {
            panjang = luas / i;
            lebar = i;
            if ((panjang+lebar)*2 < keliling)
            {
                keliling = (panjang+lebar)*2;
            }
            
        }
    }
    
    cout << keliling;

    
}

I have done several experiments and what I can conclude is **keliling ** int value can be accessed in the inner if but cannot be updated. So the resulting output is not as expected. (whatever the input, the output will be 0)