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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. int main() {
  5.   int n, m, minus = 1;
  6.   cin >> n;
  7.   m = 1;
  8.   for  (int a = 1; n> 0; a *= 10) {
  9.     for  (int b = a; b < a*10; b++) {
  10.       if ((n - minus) < 0) {
  11.         cout << 0;
  12.         return 0;
  13.       }
  14.       if ((n - minus) == 0) {
  15.         cout << m;
  16.         return 0;
  17.       }
  18.       n-= minus;
  19.       m++;
  20.     }
  21.     minus++;
  22.   }
  23.   return 0;
  24. }
Success #stdin #stdout 0s 4476KB
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https://ideone.com/mKmha9
language:
C++ (gcc 8.3)
created:
7 years ago
visibility:
secret

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