/**
* @param {number} n - a positive integer
* @return {number} - a positive integer
*/
var reverseBits = function (n) {
let res = 0;
for (let i = 0; i < 32; i++) {
res = (res << 1) + (n & 1);
n = n >>> 1;
}
return res >>> 0;
};
C++ Code：
class Solution {
public:
uint32_t reverseBits(uint32_t n) {
auto ret = 0;
for (auto i = 0; i < 32; ++i) {
ret = (ret << 1) + (n & 1);
n >>= 1;
}
return ret;
}
};
Python Code:
class Solution:
# @param n, an integer
# @return an integer
def reverseBits(self, n):
result = 0
for i in range(32):
result = (result << 1) | (n & 1)
n >>= 1
return result
# or
class Solution:
def reverseBits(self, n: int) -> int:
ans = 0
for i in range(31, -1, -1):
ans |= ((n >> i) & 1) << (31 - i)
return ans
Java Code：
public class Solution {
public int reverseBits(int n) {
int rev = 0;
for (int i = 0; i < 32 && n != 0; ++i) {
rev |= (n & 1) << (31 - i);
n >>>= 1;
}
return rev;
}
}
