백준 10093번 - C++

#include <bits/stdc++.h>
using namespace std;


int main(void) {
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	long long arr[2];
	cin >> arr[0] >> arr[1];
	sort(arr, arr + 2);
	if (arr[0] == arr[1]) {
		cout << 0;
		return 0;
	}
	cout << (arr[1]-arr[0]) - 1 << '\n';
	for (long long i = arr[0]+1; i < arr[1]; i++) cout << i<<' ';\
}