DE Shaw

1 Longest Substring Without Repeating Characters Medium 2 Evaluate Reverse Polish Notation Medium 3 Koko Eating Bananas Medium 4 Reorder List Medium 5 Merge k Sorted Lists Hard 6 Subtree of Another Tree Easy 7 Construct Binary Tree from Preorder and Inorder Traversal Medium 8 Last Stone Weight Easy 9 Combination Sum Medium 10 N-Queens Hard 11 Walls and Gates Medium 12 Reconstruct Itinerary Hard 13 Min Cost Climbing Stairs Easy 14 Maximum Product Subarray Medium 15 Coin Change 2 Medium 16 Regular Expression Matching Hard 17 Partition Labels Medium 18 Minimum Interval to Include Each Query Hard 19 Multiply Strings Medium 20 Sum of Two Integers Medium 21 Product of Array Except Self Medium 22 Container With Most Water Medium 23 Sliding Window Maximum Hard 24 Largest Rectangle in Histogram Hard 25 Median of Two Sorted Arrays Hard 26 Linked List Cycle Easy 27 Diameter of Binary Tree Easy 28 Count Good Nodes in Binary Tree Medium 29 Design Add and Search Words Data Structure Medium 30 Design Twitter Medium