mediumRecursionPattern: Mixed
Reversible Substring Pairs Solution
Problem Statement
Given a string of comma-separated integers, determine the count of unique pairs of indices where the reversed substring between those indices is equal to the substring in between with their characters in reverse order.
Examples
Example 1:
Input:1,2,3,2,1
Output:2
Explanation: Pairs (0,4) and (1,3) have substrings that are reverses of each other
Constraints
- No leading, intermediate, or trailing commas
- Indices can be out of order, but in a pair
Time: O(n^2) Space: O(1)
Analyze constraints and compute optimal solutions step-by-step.
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