1009. Complement of Base 10 Integer

https://leetcode.com/problems/complement-of-base-10-integer

Description

The complement of an integer is the integer you get when you flip all the 0's to 1's and all the 1's to 0's in its binary representation.

• For example, The integer 5 is "101" in binary and its complement is "010" which is the integer 2.

Given an integer n, return its complement.

Example 1:

**Input:** n = 5
**Output:** 2
**Explanation:** 5 is "101" in binary, with complement "010" in binary, which is 2 in base-10.

Example 2:

**Input:** n = 7
**Output:** 0
**Explanation:** 7 is "111" in binary, with complement "000" in binary, which is 0 in base-10.

Example 3:

**Input:** n = 10
**Output:** 5
**Explanation:** 10 is "1010" in binary, with complement "0101" in binary, which is 5 in base-10.

Constraints:

• 0 <= n < 109

Note: This question is the same as 476: https://leetcode.com/problems/number-complement/

ac