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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int getOccurrence(int n, int d)
  5. {
  6.     int result = 0; // Initialize result
  7.  
  8.     // Count appearances in numbers starting
  9.     // from d.
  10.     int itr = d;
  11.     while (itr <= n)
  12.     {
  13.         // When the last digit is equal to d
  14.         if (itr%10 == d)
  15.             result++;
  16.  
  17.         // When the first digit is equal to d then
  18.         if (itr != 0 && itr/10 == d)
  19.         {
  20.             // increment result as well as number
  21.             result++;
  22.             itr++;
  23.         }
  24.  
  25.         // In case of reverse of number such as 12 and 21
  26.         else if (itr/10 == d-1)
  27.             itr = itr + (10 - d);
  28.         else
  29.             itr = itr+10;
  30.     }
  31.     return result;
  32. }
  33.  
  34. // Driver code
  35. int main(void)
  36. {
  37.     int n = 2, d = 30;
  38.     cout << getOccurrence(n, d);
  39.     return 0;
  40. }
Success #stdin #stdout 0.01s 5440KB
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https://ideone.com/Nm53za
language:
C++14 (clang 8.0)
created:
1 year ago
visibility:
public

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