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Commits on Jan 26, 2026

• Update SOLUTIONS.md

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• Rename 3642. Find Books with Polarized Opinions to 3642. Find Books with Polarized Opinions.md

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• Update SOLUTIONS.md

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• Create Seasonal Sales Analysis problem documentation

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• Update date for Find Loyal Customers problem

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• Delete medium/3554. Find Category Recommendation Pairs.md

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• Change difficulty from Medium to Hard

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• Create 3554. Find Category Recommendation Pairs.md

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• Fix formatting in Rank Scores markdown file

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• Update 178. Rank Scores.md

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• Create 178. Rank Scores.md

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• Create 3220. Odd and Even Transactions.md

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• Create problem statement for subscription conversion analysis

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• Create 608. Tree Node.md

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Commits on Jan 19, 2026

• Update LeetCode SQL problem counts in README

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• Update solution counts and last update date

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• Create 1393. Capital Gain Loss.md

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• Create 3475. DNA Pattern Recognition.md

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• Add 'Find Users with High Token Usage' problem

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• Create 465. Find Products with Valid Serial Numbers.md

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Commits on Jan 15, 2026

• Create 3642. Find Books with Polarized Opinions

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• Create 3436. Find Valid Emails.md

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• Create 3570. Find Books with No Available Copies.md

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• Create 1965. Employees With Missing Information.md

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• Delete easy1965. Employees With Missing Information.md

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• Create easy1965. Employees With Missing Information.md

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• Create 1890. The Latest Login in 2020.md

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• Create 1873. Calculate Special Bonus.md

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• Update README.md

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Commits on Jan 9, 2026

• Update SOLUTIONS.md

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• Create 1407. Top Travellers.md

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• Create 1084. Sales Analysis III.md

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• Create 1179. Reformat Department Table.md

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Commits on Jan 6, 2026

• Update repository structure to include 'hard' folder

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• Update README.md

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