Post order traversal using recursion Calculate the height of the left subtree, calculate the height of the right subtree, then compare. If it's already not balanced, return -1 and directly return Time Complexity: O(N), N is the total tree nodes since it is visited once and only once Space Complexity: O(1), No...
0987-Vertical-Order-Traversal-of-a-Binary-Tree 0988-Smallest-String-Starting-From-Leaf 0989-Add-to-Array-Form-of-Integer 0990-Satisfiability-of-Equality-Equations 0991-Broken-Calculator 0992-Subarrays-with-K-Different-Integers 0993-Cousins-in-Binary-Tree 0994-Rotting-Oranges 0995-...
introduction & terminologies binary tree, definition & properties bst binary tree representation traversal technique for binary tree insertion in bst | set 1 insertion in binary search | set 2 deletion in bst | set 1 deletion in bst | set 2 hash table vs. bst constr...
You may assume thatnext()call will always be valid, that is, there will be at least a next smallest number in the BST whennext()is called. 因为是Binary Search Tree, 所以要用inorder travesal,所以可以在初始化的时候将tree 转变为stack,并且用一个指针来指向现在的node所在的位置,如果超过stack,...