The asymptotic notation O(n2) defines the complexity of type______. (polynomial, non-polynomial).

A hexagonal fractal pattern has the sequence {1, 6, 36, 216, …}. The recursive formula is ________.

c++

Postfix interpreter def postfix_evaluate(items): When arithmetic expressions are given in the familiar infix notation 2 + 3 * 4, we need to use parentheses to force a different evaluation order than the usual PEMDAS order determined by precedence and associativity. Writing arithmetic expressions in postfix notation (also known as Reverse Polish Notation) may look strange to us humans accustomed to the conventional infix notation, but is computationally far easier to handle, since postfix notation allows any evaluation order to be expressed unambiguously without using any parentheses at all! A postfix expression is given as a list of items that can be either individual integers or one of the strings '+','- and '/' for the four possible arithmetic operators. To evaluate a postfix expression using a simple linear loop, use a list as a stack that is initially empty. Loop through the items one by one, in order from left to right. Whenever the current item is an integer, just append it to…