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Grokking the Coding Interview Patterns

Solution: Reverse Integer

Explore how to reverse a 32-bit signed integer by extracting digits and reconstructing the number. Understand overflow detection within integer bounds and manage negative inputs. This lesson helps you implement a safe and efficient reverse integer function with O(n) time and O(1) space complexity.

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Statement

Given a 32-bit signed integer num, reverse its digits and return the result. If the reversed number exceeds the 32-bit signed integer range [−231,231−1][−2^{31},2^{31}−1] ...