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- #include <iostream>
- using namespace std;
- int memo[1000006];
- int f(int x) {
- if(x == 0) {
- return 0;
- }
- if(memo[x] != -1) {
- return memo[x];
- }
- int tmp = x;
- int najmal_broj_pati = 2000000;
- while(tmp > 0) {
- int cifra = tmp % 10;
- if(cifra != 0) {
- najmal_broj_pati = min(najmal_broj_pati, f(x - cifra) + 1);
- }
- tmp /= 10;
- }
- memo[x] = najmal_broj_pati;
- return najmal_broj_pati;
- }
- int main()
- {
- int n;
- cin >> n;
- for(int i = 0; i <= n; i++)
- {
- memo[i] = -1;
- }
- cout << f(n) << endl;
- return 0;
- }
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