백준(baekjoon)(BaekJoon)코딩 1065번:한수 답

#include <iostream>
using namespace std;
void Count() {
 int cnt=0, a, b, c,sub1,sub2, n;
 cin >> n;
  for (int i = 1; i <= n; i++)
  {
   a = i / 100;
   b = (i - a * 100) / 10;
   c = (i - a * 100 - b * 10) / 1;
   sub1 = a - b;
   sub2 = b - c;
   if (100 * a + 10 * b + c * 1<100)
   {
     cnt++;
   }
   if (100 * a + 10 * b + c * 1>=100)
   {
    if (sub1 == sub2 )
     cnt++;
   }
  }
  cout << cnt;
}
int main(){
 Count();
}