Coding is easy with these patterns

We cannot master everything in coding. There are patterns to master. I am attaching a image at the bottom too that will help to grasp them all quickly. Mastering these patterns will help you in passing your interviews.

1️⃣ Prefix Sum – Precompute running totals to answer range sum queries in O(1).
2️⃣ Two Pointers – Use two indices to solve search and traversal problems efficiently.
3️⃣ Sliding Window – Maintain a moving subset to optimize subarray and substring calculations.
4️⃣ Fast & Slow Pointers – Detect cycles or find midpoints in linked lists and arrays.
5️⃣ Linked List In-place Reversal – Reverse nodes without extra space using pointer manipulation.
6️⃣ Monotonic Stack – Keep elements in sorted order to quickly find next/previous greater or smaller values.
7️⃣ Top ‘K’ Elements – Use heaps or sorting to get the largest or smallest K items efficiently.