Week 8 of 43
Foundation
WEEK 8 LEARNING MODULE
Contest Analysis & Upsolving Strategies
A dedicated session on contest review, peer walkthroughs, failure point analysis, and upsolving challenging multi-variable problems.
3 Practice Problems4 Core ConceptsVerified Curriculum: high Confidence
What You'll Learn
- ✓Implement a consistent upsolving routine to solve 100% of missed contest problems.
- ✓Analyze and articulate algorithmic trade-offs through peer code presentations.
- ✓Apply sorted-tuple key hashing to group anagrams in linearithmic time.
- ✓Reduce 4-variable search spaces ($O(n^4)$) to quadratic time ($O(n^2)$) using two-phase hash tables.
Core Concepts
Contest Upsolving Methodology
Disciplined habit of analyzing and implementing solutions for all unsolved contest problems.
Peer Code Analysis
Walking through problem comprehension, alternative approaches, and implementation trade-offs.
Anagram Grouping via Canonical Keys
O(N * K log K) or O(N * K)Using sorted character strings or 26-element frequency tuples as hash map keys.
Two-Phase Hash Table Pair Sums
O(n²)Splitting 4 arrays into two pairs of 2, precomputing pairwise sums in O(n²) to achieve O(n²) total time.
Algorithms Covered
Anagram HashingPairwise Sum Precomputation (4Sum II)Character Frequency Matching
Data Structures Applied
Hash MapsHash SetsArrays
Lecture Materials
Hands-On Coding & Practice Session
No formal slide deck was attached for this review week. Focus on mastering the curated practice problems and core algorithmic paradigms above.