public class Solution
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1009 - Complement of Base 10 Integer\.
Easy
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/](https://leetcode.com/problems/number-complement/)