[C++] 백준 1065번 : 한수

https://www.acmicpc.net/problem/1065

#include <iostream>

using namespace std;

int main() {

cin.tie(NULL);

ios::sync_with_stdio(false);

int n,cnt=0;

cin >> n;

if (n < 100)

cnt = n;

else {

cnt = cnt + 99;

for (int i = 100; i <= n; i++) {

if ((i / 100 - (i % 100) / 10) == ((i % 100 / 10) - i% 10))

cnt++;

}

}

cout << cnt << "\n";

}