Classic Interview 150 Questions P190 Reverse Bits

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Timeline

Timeline

2025-11-25

init

Bit manipulation

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Problem:

P190 Reverse Bits

https://leetcode.cn/problems/reverse-bits/?envType=study-plan-v2&envId=top-interview-150

In-place reversal is a bit troublesome; you can use a temporary variable.

class Solution {
    public:
	int reverseBits(int n)
	{
		unsigned int r = 0;
		for (int i = 0; i < 32; i++) {
			r <<= 1;
			r |= (n & 1);
			n >>= 1;
		}
		return r;
	}
};