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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. long long sol(long long N) {
  5.     while (N >= 10) {
  6.         long long res = 0;
  7.         while (N > 0) {
  8.             res += N % 10;
  9.             N /= 10;
  10.         }
  11.         N = res;
  12.     }
  13.     return N;
  14. }
  15.  
  16. int main() {
  17.     long long N;
  18.     cin >> N;
  19.     cout << sol(N);
  20.     return 0;
  21. }
  22.  
Success #stdin #stdout 0s 5288KB
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https://ideone.com/OhpuSF
language:
C++ (gcc 8.3)
created:
4 hours ago
visibility:
secret

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