You are given a mathematical expression in postfix notation (RPN). During the postfix expression evaluation algorithm, enter the value that would be at the bottom of the stack after processing the 6th token on the following input: 372- +6 * (Note this is not about expression trees, this is just the stack-based algorithm for evaluating a post fix expression.)

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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.