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Lessons (6)

• Sorting Algorithms

  From simple bubble sort to merge sort and quick sort. See how each one works, compare their speeds …

• DSA Interview Patterns Cheat Sheet

  … intervals (merge overlapping meetings) js function mergeIntervals(intervals) { const sorted = intervals.toSorted((a, b) = a[0] - b[0 …

• Heaps & Priority Queues

  … merge K sorted lists Put the first element of each list in a heap; repeatedly pop the smallest …

• Two Pointers & Sliding Window

  … cycle Two arrays One pointer per array Merge two sorted arrays, intersection Example: remove duplicates in place (fast …

• Big-O Notation Made Simple

  … log n) Linearithmic ~10,000 Good sorting (merge sort, Array.sort ) O(n²) Quadratic 1,000,000 Nested …

• Linked Lists

  … js // Merge two sorted lists: 1→3→5 + 2→4 → 1→2→3→4→5 function mergeSorted(a …