Code the following in OCaml. EDIT: Write a function that looks for a pair on elements from two integer lists that sum to a given value. Note: Only use recursion and lists. You may need a auxiliary or helper function. Write the following function sumOfTwo (a, b, v) that returns true if there exists an integer a list that when added to any integer in a different list, equals the sum. Signature: val sumOfTwo : int list * int list * int -> bool = Example output: # sumOfTwo([1;2;3],[10;20;30;40],42);; :bool = true (since 2 + 40 = 42) # sumOfTwo([1;2;3],[10;20;30;40],40);; :bool = false (nothing in list 1 can be added to list 2 to get 40)

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Depth First Search

Depth-first search (DFS) also known as Depth First traversal is an algorithm used to traverse or search the nodes in a tree or graph data structure. Traversal usually means visiting all the nodes of a graph. DFS performs in a depth-ward manner. It uses a stack to remember the vertices it has visited. The search starts from the root node, where any arbitrary node is selected as a root node in a graph, and then each node is explored along each branch before performing backtracking. The DFS algorithm uses a recursive technique by following the idea of backtracking. DFS algorithm does this by performing an in-depth search of all the nodes by traversing in a forward direction. If the required node is not found, it starts backtracking to previously visited nodes.