Class Solution


  • public class Solution
    extends Object
    762 - Prime Number of Set Bits in Binary Representation\. Easy Given two integers `left` and `right`, return _the **count** of numbers in the **inclusive** range_ `[left, right]` _having a **prime number of set bits** in their binary representation_. Recall that the **number of set bits** an integer has is the number of `1`'s present when written in binary. * For example, `21` written in binary is `10101`, which has `3` set bits. **Example 1:** **Input:** left = 6, right = 10 **Output:** 4 **Explanation:** 6 -> 110 (2 set bits, 2 is prime) 7 -> 111 (3 set bits, 3 is prime) 8 -> 1000 (1 set bit, 1 is not prime) 9 -> 1001 (2 set bits, 2 is prime) 10 -> 1010 (2 set bits, 2 is prime) 4 numbers have a prime number of set bits. **Example 2:** **Input:** left = 10, right = 15 **Output:** 5 **Explanation:** 10 -> 1010 (2 set bits, 2 is prime) 11 -> 1011 (3 set bits, 3 is prime) 12 -> 1100 (2 set bits, 2 is prime) 13 -> 1101 (3 set bits, 3 is prime) 14 -> 1110 (3 set bits, 3 is prime) 15 -> 1111 (4 set bits, 4 is not prime) 5 numbers have a prime number of set bits. **Constraints:** * 1 <= left <= right <= 106 * 0 <= right - left <= 104
    • Constructor Detail

      • Solution

        public Solution()
    • Method Detail

      • countPrimeSetBits

        public int countPrimeSetBits​(int left,
                                     int right)