dsa15 min read
Find All Numbers Disappeared in an Array — Index Negation O(n) O(1) [Meta Easy]
LeetCode 448 is the definitive interview test for index-as-a-hash-key thinking. Learn the O(n) time, O(1) space negation trick that eliminates the need for any extra data structure — and every follow-up question a FAANG interviewer will throw at you after you solve it.
Read →