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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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Remove Element [Easy] — Read/Write Two Pointers
Remove all occurrences of val in-place using a write pointer pattern, returning the new length.
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Remove Duplicates from Sorted Array [Easy] — Write Pointer
Remove duplicates in-place from a sorted array using a write pointer that only advances on unique elements.
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Merge Sorted Array [Easy] — Three Pointers From End
Merge two sorted arrays in-place from the end to avoid overwriting elements using three pointers.
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Is Subsequence [Easy] — Two Pointer Greedy Match
Check if string s is a subsequence of t using a greedy two-pointer scan that matches characters in order.
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