Deleting digits

input/code.cpp: In function 'int main()':
input/code.cpp:8:13: warning: unused variable 'sum' [-Wunused-variable]
    8 |         int sum = 0, steps = 0;
      |             ^~~

#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
	int n;
	cin >> n;
	int sum = 0, steps = 0;
	while (n > 0) {
		int b = n;
		int m = 0;
		while (b > 0) {
			m = max(b % 10, m);
			b /= 10;
		}
		n -= m;
		steps++;
	}
	cout << steps;
	return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED