한수 (feat. 백준, 1065번)

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

1065번: 한수

 

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// woohyeon.kim
// kim519620.tistory.com
#include <iostream>
using namespace std;
int solve(register int n) {
	register int cnt = 0;
	if (n < 100)
		return n;
	else {
		cnt = 99;
		for (register int i = 100; i <= n; i++) {
			register int t1 = i / 100;
			register int t2 = (i / 10) % 10;
			register int t3 = i % 10;
			if (t1 - t2 == t2 - t3)
				cnt++;
		}
	}
	return cnt;
}
int main() {
	ios::sync_with_stdio(false), cin.tie(NULL);
	register int N;
	cin >> N;
	cout << solve(N);
	return 0;
}