dsa1 min read
Reduce Array Size to At Least Half
Find the minimum number of elements to remove to reduce array size by half by greedily removing most frequent elements.
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dsa1 min read
Find Subsequence of Length K With the Largest Sum
Find the subsequence of length k with the largest sum by selecting top k values while preserving original order.
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dsa5 min read
Heaps & Priority Queues — Master Recap & Cheatsheet
Complete Heaps section recap with 7 patterns, complexity guide, and full problem index for interview prep.
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dsa5 min read
Linked Lists — Complete Guide: All Patterns & Problem Index
Master every linked list pattern: reverse, two pointers, cycle detection, merge, clone, and design problems — with templates and full index of 45 problems.
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dsa2 min read
Reverse Linked List — Iterative and Recursive
Reverse a singly linked list iteratively with three-pointer technique and recursively with call stack.
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