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4 problems (filtered)

Difficulty

All Easy Medium Hard

Pattern

All two pointers sliding window binary search dfs hash map stack greedy bfs graph heap trie dynamic programming backtracking

Category

All array string linked list tree hash map stack graph heap dynamic programming backtracking

Access

All Free ★ Premium

Valid Palindrome

EasyFreetwo pointersstring

MetaMicrosoftApple

Longest Substring Without Repeating Characters

MediumFreesliding windowstring

AmazonMetaGoogle

Minimum Window Substring

Hard★ Premiumsliding windowstring

MetaAmazonGoogle

Longest Repeating Character Replacement

MediumFreesliding windowstring

GoogleAmazonMicrosoft