Deleting digits

#include <algorithm>
#include <iostream>
#include <queue>
#include <vector>

using namespace std;


int best(int x) {

    if (x == 0) return 0;
    else if (x < 0) return 99999999;
    //cout << x << endl;

    int y = x;

    

    int miny = 99999999;
    while (y != 0) {
       //cout << y << endl;
         if (y%10 != 0) miny = min(miny, best(x - (y%10)) + 1);
        y /= 10;
    }

    return miny;
}


int main() {

    int x;
    cin >> x;

    cout << best(x) << endl;


}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: TIME LIMIT EXCEEDED

Test 5

Verdict: TIME LIMIT EXCEEDED

Test 6

Verdict: TIME LIMIT EXCEEDED

Test 7

Verdict: TIME LIMIT EXCEEDED

Test 8

Verdict: TIME LIMIT EXCEEDED

Test 9

Verdict: TIME LIMIT EXCEEDED

Test 10

Verdict: TIME LIMIT EXCEEDED

Test 11

Verdict: TIME LIMIT EXCEEDED

Test 12

Verdict: TIME LIMIT EXCEEDED

Test 13

Verdict: TIME LIMIT EXCEEDED