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English Version

题目描述

整数转换。编写一个函数,确定需要改变几个位才能将整数A转成整数B。

示例1:

 输入:A = 29 (或者0b11101), B = 15(或者0b01111)
 输出:2

示例2:

 输入:A = 1,B = 2
 输出:2

提示:

  1. A,B范围在[-2147483648, 2147483647]之间

解法

Python3

Java

class Solution {
    public int convertInteger(int A, int B) {
        return Integer.bitCount(A ^ B);
    }
}

TypeScript

function convertInteger(A: number, B: number): number {
    let res = 0;
    while (A !== 0 || B !== 0) {
        if ((A & 1) !== (B & 1)) {
            res++;
        }
        A >>>= 1;
        B >>>= 1;
    }
    return res;
}

Rust

impl Solution {
    pub fn convert_integer(a: i32, b: i32) -> i32 {
        (a ^ b).count_ones() as i32
    }
}

...