Timer is Running

You are given a **S**ingly **L**inked **L**ist with **N **nodes where each node next pointing to its next node. You are also given **M** random pointers , where you will be given **M **number of pairs denoting two nodes **a** and **b** **i.e. **a->arb = b**.**

**Input:**

First line of input contains number of testcases T. For each testcase, first line of input contains two integers **N** and **M**. Next line of input contains values of **N** nodes of the linked list and last line contains **M **pairs denoting arbitrary connecting nodes, for which each **i ^{th}** node is connected to any

**Output:**

For each testcase, clone the given linked list.

**Your Task:**

The task is to complete the function **copyList**() which takes one argument the head of the linked list to be cloned and should **return** the head of the cloned linked list.

**Expected Time Complexity** : O(n)

**Expected Auxilliary Space **: O(1)

**Constraints:**

1 <= T <= 100

1 <= N <= 100

1 <= M <= N

1 <= a, b <= 100

**Example:
Input:**

2

4 2

1 2 3 4

1 2 2 4

4 3

1 3 5 9

1 1 3 4

1

1

**Explanation:**

**Testcase 1:** In this test case, there are 4 nodes in linked list. Among these 4 nodes, 2 nodes have arbit pointer set, rest two nodes have arbit pointer as NULL. Third line tells us the value of four nodes. The fourth line gives the information about arbitrary pointers. The first node arbit pointer is set to node 2. The second node arbit pointer is set to node 4.

**Testcase 2:** In the given testcase , applying the method as stated in the abpve testcase , the output will be 1.

Author: Shubham Joshi 1

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