Deleting digits

#include <bits/stdc++.h>

using namespace std;

int n;

/*
map<int, int> store;

int solve(int x) {

    if (store.count(x))
        return store[x];
    
    int y = x;
    int minimum = INT_MAX;

    while (y > 0) {
        int d = y % 10;
        y /= 10;
        if (d > 0 && x - d >= 0)
            minimum = min(minimum, 1 + solve(x - d));
    }

    store[x] = minimum;
    return minimum;

}
*/

int iterative() {

    if (n <= 9)
        return 1;

    vector<int> store(n+1);

    store[0] = 0;
    for (int i = 1; i <= 9; i++)
        store[i] = 1;
    
    for (int k = 10; k <= n; k++) {
        int minimum = INT_MAX;
        int y = k;
        while (y > 0) {
            int d = y % 10;
            y /= 10;
            if (d > 0)
                minimum = min(minimum, 1 + store[k - d]);
        }
        store[k] = minimum;
    }

    return store[n];

}

int main() {

    // store[0] = 0;
    cin >> n;

    cout << iterative() << endl;
    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