@lee215 is popular author and contributor to various problems on Leetcode. Throughout the years, he has recommended problems on variety of algorithm categories. Below is an comprehensive problem set collected from his many posts. Will update the post if I see new good problems. Or comment below if you have any recommendations. Happy coding.

Stack

• 1425. Constrained Subsequence Sum
• 1130. Minimum Cost Tree From Leaf Values
• 907. Sum of Subarray Minimums
• 901. Online Stock Span
• 856. Score of Parentheses
• 503. Next Greater Element II
• 496. Next Greater Element I
• 84. Largest Rectangle in Histogram
• 42. Trapping Rain Water

Sliding Window

• 1425. Constrained Subsequence Sum
• 1358. Number of Substrings Containing All Three Characters
• 1248. Count Number of Nice Subarrays
• 1234. Replace the Substring for Balanced String
• 1004. Max Consecutive Ones III
• 930. Binary Subarrays With Sum
• 992. Subarrays with K Different Integers
• 904. Fruit Into Baskets
• 862. Shortest Subarray with Sum at Least K
• 209. Minimum Size Subarray Sum

Binary Search

• 1482. Minimum Number of Days to Make m Bouquets
• 1283. Find the Smallest Divisor Given a Threshold
• 1231. Divide Chocolate
• 1011. Capacity To Ship Packages In N Days
• 875. Koko Eating Bananas
• 774. Minimize Max Distance to Gas Station
• 410. Split Array Largest Sum

Bonus (Monotone Stack)

• 739. Daily Temperatures
• 862. Shortest Subarray with Sum at Least K