func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 20;   const int inf = 1e9;   int dp[N][2];   vector<int> a;   void upd(int& at, int val) { at = max(at, val); }   int main() {     long long n;     scanf( %lld , &n);     while (n) {       a.push_back(n % 10);       n /= 10;     }     for (int i = 0; i < N; i++) {       dp[i][0] = dp[i][1] = -inf;     }     dp[0][0] = 0;     for (int i = 0; i < a.size(); i++) {       for (int add = 0; add <= 10; add += 10) {         for (int st = 0; st <= 1; st++) {           int sum = add + a[i] - st;           for (int j = 0; j <= min(9, sum); j++) {             int k = sum - j;             if (0 <= k && k <= 9) {               upd(dp[i + 1][add / 10], dp[i][st] + j + k);             }           }         }       }     }     cout << dp[a.size()][0] << endl;     return 0;   }   