Barclays

1 Interleaving String Medium 2 Jump Game Medium 3 Insert Interval Medium 4 Spiral Matrix Medium 5 Single Number Easy 6 Contains Duplicate Easy 7 Encode and Decode Strings Medium 8 Best Time to Buy and Sell Stock Easy 9 Min Stack Medium 10 Search a 2D Matrix Medium 11 Merge Two Sorted Lists Easy 12 LRU Cache Medium 13 Same Tree Easy 14 Kth Smallest Element in a BST Medium 15 Kth Largest Element in a Stream Easy 16 Subsets Medium 17 Letter Combinations of a Phone Number Medium 18 Rotting Oranges Medium 19 Word Ladder Hard 20 Climbing Stairs Easy 21 Coin Change Medium 22 Best Time to Buy and Sell Stock with Cooldown Medium 23 Burst Balloons Hard 24 Merge Triplets to Form Target Triplet Medium 25 Meeting Rooms II Medium 26 Pow(x, n) Medium 27 Missing Number Easy 28 Top K Frequent Elements Medium 29 3Sum Medium 30 Minimum Window Substring Hard