1475 : 방 번호 [C++]

#include <iostream>
#include <string>

using namespace std;

int main()
{
 string N;
 getline(cin, N, '\n');

 int Digit[9] = { 0, };

 for (int i = 0; i < N.size(); i++)
 {
  if (N[i] - '0' == 6 || N[i] - '0' == 9)
   Digit[6]++;
  else
   Digit[N[i] - '0']++;
 }

 Digit[6] = (Digit[6] + 1) / 2;

 int Set = 0;

 for (int i = 0; i < 9; i++)
 {
  if (Digit[i] >= Set)
   Set = Digit[i];
 }

 cout << Set;
}