Leetcode题解 190. Reverse Bits

Reverse bits of a given 32 bits unsigned integer.

For example, given input 43261596 (represented in binary as 00000010100101000001111010011100), return 964176192 (represented in binary as 00111001011110000010100101000000).

用数组来存储二进制的每一位。

public class Solution {
// you need treat n as an unsigned value
public int reverseBits(int n) {
int[] a=new int[32];
int count=0;
while(count<32){
a[count]=n&1;
n=n>>1;
count++;
}
int result=0;
for(int i=0;i<32;i++){
result=result*2+a[i];
}
return result;
}
}