Two of the nodes of a Binary Search Tree (BST) are swapped. Fix (or correct) the BST.
First line consists of T test cases. First line of every test case consists of N, denoting number of elements in BST. Second line of every test case consists 3*N elements 2 integers and a character.
Note: It is guaranteed than the given input will form BST ,except for 2 nodes that will be wrong.
Return the fixed BST.
10 5 L 10 8 R 5 2 L 5 20 R