LeetCode Problems 4000–4010: Patterns and Approaches Broken Down

LeetCode has expanded its problem set beyond 4,000 entries, with 4,055 problems available at the time of writing. Problems numbered 4000 through 4010 — excluding 4004 and 4005 — span Easy, Medium, and Hard difficulty levels. The problems cover a wide range of algorithmic patterns, including Greedy, Dijkstra, Two Pointers, Combinatorics, and Prefix Sums. A DEV Community post analyzes each problem's core approach, expected time and space complexity, and the key patterns needed to solve it. The breakdown aims to help developers recognize recurring techniques and apply them more efficiently during competitive programming practice.