A Number After a Double Reversal

Problem Description

Given an integer num, reverse num to get reversed1, then reverse reversed1 to get reversed2. Return true if reversed2 equals num. Otherwise, return false.

Key Insights

• Reversing an integer involves reversing its digits and discarding leading zeros.
• The operation is idempotent when applied twice: reversing the reversed integer should yield the original integer.
• The problem can be simplified by directly checking if reversing the number twice results in the original number.

Space and Time Complexity

Time Complexity: O(n) - where n is the number of digits in the integer. Space Complexity: O(1) - no additional data structures are used that grow with input size.

Solution

To solve the problem, we will:

1. Reverse the digits of the integer.
2. Reverse the result of the first reversal.
3. Compare the final result with the original integer to determine equality.

The algorithm primarily involves string manipulation to reverse the digits, ensuring leading zeros are discarded automatically.

Code Solutions