The complementof 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.

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For example, The integer 5is "101"in binary and its complementis "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

就是先求出来这个数对应的二进制的数字，然后将二进制的1变成0,0变成1；再返回对应的十进制的数字，原理简单，但是我把0忽略了，所以fail一次；

下面是代码：

Runtime1 ms

Beats

20.95%

Memory39.8 MB

Beats

19.32%

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