1582 articles
Find the maximum number of chunks that can be individually sorted to produce the full sorted array. A chunk boundary exists when the running maximum equals the current index — a clean O(n) greedy.
Complete Greedy and Monotonic Stack cheatsheet covering all patterns, templates, complexity table, decision tree, and problem index. The single page to revise before any FAANG interview.
Master the hashmap interview patterns that power 87 percent of FAANG O(1) lookup questions: complement maps, frequency counting, prefix-sum hashing, two-way bijections, and cache design across 45 LeetCode problems.
LeetCode 1 Two Sum is the most asked FAANG hashmap interview question. Master the one-pass complement HashMap that turns the brute-force O(n^2) into O(n).
LeetCode 242 Valid Anagram is a top FAANG warm-up that trains the frequency-array hashmap pattern reused in Group Anagrams, Find All Anagrams, and Minimum Window Substring.