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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 the same variable powers.

**Note:** Given polynomials are sorted in decreasing order of power.

**Example 1:**

**Input:
**LinkedList1: (1,x^{2) }
LinkedList2: (1,x^{3})
**Output:
**1x^3 + 1x^2
**Explanation: **Since, x^{2} and x^{3} both have
different powers as 2 and 3. So, their
coefficient can't be added up.

**Example 2:**

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

**Your Task:**

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 <= 10^{5}

1 <= x, y <= 10^{6}

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Polynomial Addition

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