CustomCC0-1.0#P0151500
Unordered Pair Palindromic Concatenation
Summary
- •Phase 2 / String, Hashing
- •Reasoning-first competitive programming drill
Problem Description
Given a set of N distinct strings, count the number of unordered pairs (i, j) () such that the concatenation S[i]+S[j] is a palindrome.
How to read this problem in plain language:
- This is a Phase 2 reasoning drill focused on String, Hashing.
- Typical lenses to test first: string, palindrome, hash.
- Constraints reminder: 1 ≤ , 1 ≤ ≤ 10
Mini examples for mental simulation:
1) Boundary example: Describe why this case is tricky. Explain expected behavior and why naive logic may fail.
2) Adversarial example: Adversarial case where naive greedy/local decision looks correct but fails globally.
Lite-mode writing target:
- Write 1~2 observations that shrink the search space.
- Name one final algorithm and state target complexity explicitly.
- Validate with at least 2 edge cases and one hand simulation.
Constraints
- •1 ≤ , 1 ≤ ≤ 10
Analysis
Key Insight
Use this hint to refine your reasoning. This step should reduce search space or formalize correctness. State why this insight changes your algorithm choice.
stringpalindromehash