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The number of reversing twice in leetcode simple question
2022-07-06 15:04:00 【·Starry Sea】
subject
reverse An integer means inverting all its bits .
for example , reverse 2021 obtain 1202 . reverse 12300 obtain 321 , Do not retain leading zeros .
Give you an integer num , reverse num obtain reversed1 , Then reverse reversed1 obtain reversed2 . If reversed2 be equal to num , return true ; otherwise , return false .
Example 1:
Input :num = 526
Output :true
explain : reverse num obtain 625 , Then reverse 625 obtain 526 , be equal to num .
Example 2:
Input :num = 1800
Output :false
explain : reverse num obtain 81 , Then reverse 81 obtain 18 , It's not equal to num .
Example 3:
Input :num = 0
Output :true
explain : reverse num obtain 0 , Then reverse 0 obtain 0 , be equal to num .
Tips :
0 <= num <= 10^6
source : Power button (LeetCode)
Their thinking
As long as a bit is 0 And not a single digit , Then the reversal will not succeed , Otherwise, success .
class Solution:
def isSameAfterReversals(self, num: int) -> bool:
return False if str(num)[-1]=='0' and len(str(num))>1 else True
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