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543. Diameter of Binary Tree1249. Minimum Remove to Make Valid Parent408. Valid Word Abbreviation680. Valid Palindrome II1762. Buildings With an Ocean View1650. Lowest Common Ancestor of a Binary Tree III339. Nested List Weight Sum528. Random Pick with Weight50. Pow(x, n)346. Moving Average from Data Stream34. Find First and Last Position of Element in Sorted Array215. Kth Largest Element in an Array31. Next Permutation1570. Dot Product of Two Sparse Vectors129. Sum Root to Leaf Numbers938. Range Sum of BST169. Majority Element354. Russian Doll Envelopes287. Find the Duplicate Number71. Simplify Path986. Interval List Intersections138. Copy List with Random Pointer1110. Delete Nodes And Return Forest863. All Nodes Distance K in Binary Tree791. Custom Sort String1539. Kth Missing Positive Number1229. Meeting Scheduler173. Binary Search Tree Iterator2265. Count Nodes Equal to Average of Subtree498. Diagonal Traverse536. Construct Binary Tree from String1047. Remove All Adjacent Duplicates In String124. Binary Tree Maximum Path Sum647. Palindromic Substrings1216. Valid Palindrome III670. Maximum Swap270. Closest Binary Search Tree Value