【LeetCode】1012. Complement of Base 10 Integer 解题报告(Python)
作者: 负雪明烛
id: fuxuemingzhu
个人博客: http://fuxuemingzhu.cn/
题目地址:https://leetcode.com/problems/complement-of-base-10-integer/
题目描述
Every non-negative integer N
has a binary representation. For example, 5
can be represented as "101"
in binary, 11
as "1011"
in binary, and so on. Note that except for N = 0
, there are no leading zeroes in any binary representation.
The complement of a binary representation is the number in binary you get when changing every 1
to a 0
and 0
to a 1
. For example, the complement of "101"
in binary is "010"
in binary.
For a given number N
in base-10, return the complement of it’s binary representation as a base-10 integer.
Example 1:
Input: 5
Output: 2
Explanation: 5 is "101" in binary, with complement "010" in binary, which is 2 in base-10.
Example 2:
Input: 7
Output: 0
Explanation: 7 is "111" in binary, with complement "000" in binary, which is 0 in base-10.
Example 3:
Input: 10
Output: 5
Explanation: 10 is "1010" in binary, with complement "0101" in binary, which is 5 in base-10.
Note:
0 <= N < 10^9
题目大意
求一个数的补码。
解题方法
很简单一个作弊方法,直接求二进制,然后把1改成0,把0改成1即可。
Python代码如下:
class Solution(object):
def bitwiseComplement(self, N):
"""
:type N: int
:rtype: int
"""
return int("".join(map(lambda x :"0" if x == "1" else "1", bin(N)[2:])), 2)
日期
2019 年 3 月 21 日 —— 好久不刷题,重拾有点难
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