WHAT IS THIS????

Question

#include <iostream>
#include <fstream>
#include <cmath>
using namespace std;

ifstream in("max.in");
int n, nr, cnr,
i, j, u, uc,
max1 = 0, max2, ss[3500];// sir schimbat

int main()
{
in >> n;
for (i = 0; i < n; i++)
{
in >> nr;
cnr = nr;
max2 = nr;
u = -1;
// 43, 32, 9, 43, 21, 76, 211, 97, 321.
while (cnr > 0)
{
cnr /= 10;
u++;
}

cout << nr << '\n';
for (j = 0; j < u; j++)
{

uc = nr % 10;
nr = nr / 10;
nr = nr + pow (10, u) * (uc == 0 ? 1 : uc);

if (max2 < nr) max2 = nr;
cout << nr << '\n';
}
if (max1 < max2) max1 = max2;
ss[i] = max2;
cout << "max1:"<< max1;

}

}
// Could you please test this out on your machine and put these numbers (9 34 23 9 43 21 67 121 79 213) in "max.in" ?
// You'll also have to create the "max.in" file oviously

// This program is supposed to try all different combinations of the digits of the numbers within a set taken one by one while keeping record of the biggest number that was met which is max1

// I'm having very weird bugs, help me!
// max1 is supposed to be 321

Answer 1

You (and we) could test here easily enough by writing your input file first.

int main() {
string heredoc = R"(9 34 23 9 43 21 67 121 79 213)";
ofstream out("max.in");
out << heredoc;
out.close();

// Then just move your "in" stream to the next line:
ifstream in("max.in");

Now your code runs here with an input file.

Answer 2

now I've seen that for some reason it doesn't work right on my pc but it works in the sololearn playground, weird isn't it?

Answer 3

Maybe a version difference?
https://code.sololearn.com/cu8tmoP4h80H/?ref=app

Hopefully someone can help more (I have to sign off soon).