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  1. #include <iostream>
  2. #include <map>
  3. #include <vector>
  4. #include <queue>
  5. using namespace std;
  6. string  fun(string s , int n) {
  7.     if (s.size() == 1 && n == 1) {
  8.         return s;
  9.     }
  10.       long long sm = 0;
  11.       for (int i = 0; i < s.size(); i++) {
  12.           sm += s[i] - '0';
  13.       }
  14.       sm *= n;
  15.       return fun(to_string(sm) , 1);
  16. }
  17. int main() {
  18.     ios::sync_with_stdio(false);    cin.tie(NULL);     cout.tie(NULL);
  19.     string s;
  20.     int n;
  21.     cin >> s >> n;
  22.     cout << fun(s , n);
  23.  
  24. }
  25.  
Success #stdin #stdout 0s 5288KB
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https://ideone.com/XhD9EB
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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