Cracking Coding Interviews: Ultimate Guide

Cracking Coding Interviews: The 2026 Approach

The coding interview landscape has evolved significantly. While "Cracking the Coding Interview" (CTCI) by Gayle McDowell remains a foundational resource, 2026 interviews require additional preparation: more emphasis on system design, behavioral rounds, and practical coding (not just algorithmic puzzles).

The 2026 coding interview formula: 15 core patterns × 3 variations each = 45 problems that cover 90% of interview questions. This is more efficient than grinding 500+ random LeetCode problems.

The 15 Core Coding Patterns

1. Two Pointers (sorted arrays, palindromes)
2. Sliding Window (max/min subarray, substring)
3. Fast & Slow Pointers (linked list cycles)
4. Merge Intervals (overlapping intervals)
5. Cyclic Sort (missing numbers in range)
6. In-place Linked List Reversal
7. BFS (level-order, shortest path)
8. DFS (tree paths, backtracking)
9. Two Heaps (median finder)
10. Subsets (combinations, permutations)
11. Modified Binary Search (rotated, bounds)
12. Top K Elements (heap-based)
13. K-Way Merge (sorted lists)
14. Topological Sort (dependencies)
15. Dynamic Programming (5 sub-patterns)

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