2119. A Number After a Double Reversal
Description
Reversing an integer means to reverse all its digits.
- For example, reversing
2021
gives1202
. Reversing12300
gives321
as the leading zeros are not retained.
Given an integer num
, reverse num
to get reversed1
, then reverse reversed1
to get reversed2
. Return true
if reversed2
equals num
. Otherwise return false
.
Example 1:
Input: num = 526 Output: true Explanation: Reverse num to get 625, then reverse 625 to get 526, which equals num.
Example 2:
Input: num = 1800 Output: false Explanation: Reverse num to get 81, then reverse 81 to get 18, which does not equal num.
Example 3:
Input: num = 0 Output: true Explanation: Reverse num to get 0, then reverse 0 to get 0, which equals num.
Constraints:
0 <= num <= 106
Solutions
Solution 1
1 2 3 |
|
1 2 3 4 5 |
|
1 2 3 4 5 6 |
|
1 2 3 |
|