注意数的位数，需要使用long类型
移位操作符也需要注意是long类型

二进制减法
(1111)2 - (100)2 = (1011)2

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long a = sc.nextLong();
        long b = sc.nextLong();

        int length1 = Long.toBinaryString(a).length();
        int length2 = Long.toBinaryString(b).length();

        int count = 0;
        for (int i = length1 - 1; i <= length2; i++) {
            for (int j = 0; j <= i - 2; j++) {
                long res = (1L << i) - 1 - (1L << j);//使用长整型数据L
                if (res >= a && res <= b) {
                    count++;
                }
            }
        }
        System.out.println(count);
    }
}