大家都说这题BT,果然BT，我的全部TLE，哪位大佬帮我看看，球球了

#include <iostream>
using namespace std;

int main() {
    int l, r, cnt = 0;
    cin >> l >> r;

    for (int a = 1; a <= r; l *= 2) {
        for (int b = a; b <= r; b *= 2) {
            int n = a + b;
            if (n >= l && n <= r) {
                cnt++;
            }
        }
    }

    cout << cnt << endl;
    return 0;
}