Please help using below template

A polynomial may be represented as a linked list where each node contains the coefficient and exponent of a term of the polynomial . The polynomial 4 X - 3 X2 5 would be represented as a linked list given below. Equation1 43 -3 2 -5 0 Write a program system that reads two polynomials in any order of exponent from an input file, stores them as linked lists and prints the polynomial in a sorted order to an output file NOTE: Must write a very general program using Object oriented concept. Do not use any library functions. All methods used in the program MUST be written in C++ and included in the program. KEYWORDS: Classes Pointers Submit a. Documented program b. Input file. c. Output file. Test run for the following inputs (Do not change the order of exponent in the input file) A) Equationl : 18X5 7x + 6x2 + 6 Equation 2 : 8x - 7x4 +6X +972 8X+9 Equation 3 : 8X - 7x + 6X2 +6 Equation : 8X - 7x2 + 6x4 + 9x - 8 Equations : 8X - 6+ 5x + 6x + 8X8 7x?+6X Equation : 9x - 6X2 + 5x4 + 18X-9 struct nodetype { int coeff; int exp; nodetype *next; class equation { private: nodetype "begin, *last; int length; public: //Default constructor equation(); // Method to insert an item in the linked list in a sorted order void insertitem( nodetype temp); // Method to output all the items in the linked list void printlist(); // Method to add two equation equation add(equation e2)