Leetcode练习 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.
求各位取反后的数,直接用not会把前面的位数都算上。。。这边用了一个highestOneBit函数,直接返回最大1所在的位置的数
public class Solution { public int findComplement(int num) { int n=(Integer.highestOneBit(num)<<1)-1; return n^num; }}
0 0
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