Week 4

Patterns: Prefix Sum
Total Problems: 9
Completed: 9 (100%)

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Progress by Difficulty

Difficulty	Total	Completed	Remaining	Percentage
🟢 Easy	2	2	0	100%
🟡 Medium	6	6	0	100%
🔴 Hard	1	1	0	100%

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Problems

#	Problem	Pattern	D	Status	Conf
46	Range Sum Query - Immutable	Prefix Sum	E	✅	HGH
47	Find Pivot Index	Prefix Sum	E	✅	HGH
48	Product of Array Except Self	Prefix Sum	M	✅	HGH
49	Range Sum Query 2D - Immutable	Prefix Sum	M	✅	LOW
50	Continuous Subarray Sum	Prefix Sum	M	✅	MED
51	Contiguous Array	Prefix Sum	M	✅	MED
52	Subarray Sum Equals K	Prefix Sum	M	✅	HGH
53	Subarray Sums Divisible by K	Prefix Sum	M	✅	HGH
54	Maximum Subarray	Prefix Sum	H	✅	LOW

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Last Updated: 2026-02-13 19:40:00
Auto-generated from CSV by update_progress.py