Solve linked-list and top-K algorithm tasks

Q: Solve linked-list and top-K algorithm tasks

This question evaluates competency in fundamental data structures and algorithmic techniques, including linked list manipulation, frequency counting and top‑K retrieval, closest-point geometric queries, and stack-based string processing for repeated deletions.

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Given a singly linked list, return the k-th node counted from the end.

Given an integer array, return the top k most frequent numbers.

Given a list of points on the 2-D plane, return the k points closest to the origin (0, 0).

Given a string where adjacent identical characters "collide" and disappear repeatedly (e.g., "abbba" → "aa" → ""), output the final string after all collisions are resolved.

https://leetcode.com/problems/remove-nth-node-from-end-of-list/description/ https://leetcode.com/problems/top-k-frequent-elements/description/ https://leetcode.com/problems/k-closest-points-to-origin/description/ https://leetcode.com/problems/remove-all-adjacent-duplicates-in-string-ii/description/

Solve linked-list and top-K algorithm tasks

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