What data structure is typically used to implement recursion?
Question
What data structure is typically used to implement recursion?
Solution
The data structure that is typically used to implement recursion is the Stack.
Here's a step-by-step explanation:
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When a recursive function is called, the computer needs to "remember" the previous state of the function to be able to return to it once the recursive call is completed.
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This is where the Stack data structure comes in. A Stack is a Last-In-First-Out (LIFO) data structure, meaning the last item added to the Stack is the first one to be removed.
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When a recursive function is called, the current state of the function (including the values of its variables, the place in the program it was called from, etc.) is pushed onto the Stack.
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Then, the recursive call is made. If this call includes further recursive calls, their states are also pushed onto the Stack.
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Once a recursive call is completed (i.e., it hits a base case), its state is popped from the Stack, and execution resumes at
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