duplicate 3 element 3 inorder 2 preorder 2 postorder 2 pre 2 in 2 post 2 order 2 pre-order 2 pre order 2 in-order 2 in order 2 post-order 2 post order 2 dfs 2 DFS 2 bfs 2 BFS 2 stl 2 balanced binary tree 2 balanced bst 2 full binary tree 2 full binary trees 2 data 2 structure 2 structures 2 data structure 2 datastructure 2 data-structure 2 data structures 2 datastructures 2 data-structures 2 in data structures 2 in data structure 2 DataStructure 2 DataStructures 2 traversal 2 util 2 collection 2 Collection 2 collections 2 Collections 2 binary-search-tree 2 deapth-first-search 2 deque 2 dequeue 2 dijkstra-algorithm 2 directed-graph 2 floyd-warshall-algorithm 2 graph 2 heap 2 javascript-data-structures 2 linked-list 2 red-black-tree 2 recursive 2 iterative 2 leaf 2 root 2 parent 2 child 2 depth 2 Node.js 2 CommonJS 2 ES6 2 UMD 2 esmodule 2 java.util 2 c++ stl 2 c++ std 2 Python collections 2 System.Collections.Generic 2 STL 2 Tree Multiset 2 multiset 2 balanced 2 Balanced 2 avl 2 AVL 2 tree 2 Tree 2 avl tree 2 avl-tree 2 avltree 2 AVL Tree 2 selfbalance 2 self balance 2 self 2 auto 2 height 2 balance 2 tree multiset 2 node 2 nodes 2 elements 2 count 2 Count 2 order statistics 2 self balancing 2 selfbalancing 2