181. Flip Bits【LintCode, by java】
Description
Determine the number of bits required to flip if you want to convert integer n to integer m.
Both n and m are 32-bit integers.
Example
Given n = 31 (11111), m = 14 (01110), return 2.
解题:比较两个整数对应的二进制数,共有多少位不同。注意,负数也包含在内。“>>>”在无符号右移,用0补齐。
public class Solution {
/**
* @param a: An integer
* @param b: An integer
* @return: An integer
*/
public int bitSwapRequired(int a, int b) {
// write your code here
int count = 0;
for (int c = a ^ b; c != 0; c = c >>> 1) {
count += c & 1;
}
return count;
}
}
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