Question
programming in main.cpp. Start program by initializing an empty AVL tree. Your program takes one line as input. The input line contains n modification moves
programming in main.cpp.
Start program by initializing an empty AVL tree. Your program takes one line as input. The input line contains n "modification moves" separated by spaces (1 n 100). The available modification moves are
Aint (Character A followed by an int value between 1 and 100): A3 means insert value 3 into the AVL
tree. If 3 is already in the tree, do nothing.
Dint (Character D followed by an int value between 1 and 100): D3 means delete value 3 into the AVL tree. I
f 3 is not in the tree, do nothing.
Your input is then followed by exactly one finishing move (PRE or POST or IN): If the finishing move is
PRE, then you should print out the tree (in its current situation) in pre-order. If the tree is empty, print out
EMPTY. Otherwise, print out the values separated by spaces. POST and IN are handled similarly.
You don't need to worry about invalid inputs.
Sample input 1: A1 A2 A3 IN
Sample output 1: 1 2 3
Sample input 2: A1 A2 A3 PRE
Sample output 2: 2 1 3
Sample input 3: A1 D1 POST
Sample output 3: EMPTY
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