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Tries — Master Recap & Cheatsheet
Complete Tries cheatsheet: core operations, 5 patterns, binary trie for XOR, complexity table, and decision guide.
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Two Pointers & Sliding Window — Complete Guide (Problems 101–160)
Master Two Pointers and Sliding Window patterns with 60 problems, 5-language solutions, and MAANG company tags.
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Valid Palindrome [Easy] — Two Pointers Inward
Check if a string is a palindrome after removing non-alphanumeric characters using inward two pointers.
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Reverse String [Easy] — Two Pointers In-Place Swap
Reverse an array of characters in-place using the classic two-pointer swap technique.
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Squares of Sorted Array [Easy] — Two Pointers Fill from End
Return squares of a sorted array in sorted order using two pointers that compare absolute values from both ends.
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