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);
}
}