476. Number Complement
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Given a positive integer, output its complement number. The complement strategy is to flip the bits of its binary representation.
Note:
The given integer is guaranteed to fit within the range of a 32-bit signed integer.
You could assume no leading zero bit in the integer’s binary representation.
Example 1:
Input: 5Output: 2Explanation: The binary representation of 5 is 101 (no leading zero bits), and its complement is 010. So you need to output 2.
Example 2:
Input: 1Output: 0Explanation: The binary representation of 1 is 1 (no leading zero bits), and its complement is 0. So you need to output 0.
如果我们能知道该数最高位的1所在的位置,就可以构造一个长度和该数据所占位置一样长的一个掩码mask,然后概述和mask进行异或即可。
例如:5的二进制是101,我们的构造的掩码为mask=111,两者异或则为010,即是所要的结果。
public class Solution { public int findComplement(int num) { int mask = 1, temp = num; while(temp > 0) { mask = mask << 1; temp = temp >> 1; } return num^(mask-1); }}
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