Medium Accuracy: 50.0% Submissions: 10405 Points: 4

Given two polynomial numbers represented by a linked list. The task is to complete the  function addPolynomial() that adds these lists meaning adds the coefficients who have same variable powers.

Example 1:

Input:
Output:
1x^3 + 1x^2
Explanation: Since, x2 and x3 both have
different powers as 2 and 3. So, their
coefficient can't be added up.


Example 2:

Input:
LinkedList1:  (1,x3) -> (1,x2)
LinkedList2:  (3,x3) -> (4,x2)
Output:
4x^3 + 6x^2
Explanation: Since, x3 has two different
coefficients as 3 and 1. Adding them up
will lead to 4x3. Also, x2 has two
coefficients as 4 and 2. So, adding them
up will give 6x2.

The task is to complete the function addPolynomial() which should add the polynomial with same powers return the required polynomial in decreasing order of the power in the form of a linked list.
Note: Try to solve the question without using any extra space.

Expected Time Complexity: O(N+M)
Expected Auxiliary Space: O(1)

Constraints:
1 <= N, M <= 105
1 <= x, y <= 106

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