# Is DFS tail recursive?

## Is DFS tail recursive?

It’s not tail recursive because the last call is not to go , but to foldLeft . There’s no way it could be even mutually tail recursive, as foldLeft calls go multiple times. It’s hard to make DFS tail recursive, as the recursive algorithm relies heavily on the call stack to keep track of your position in the tree.

### Is tail recursion recursive?

A tail recursion is a recursive function where the function calls itself at the end (“tail”) of the function in which no computation is done after the return of recursive call. Many compilers optimize to change a recursive call to a tail recursive or an iterative call.

Is binary search tail recursive?

The answer is yes, it is tail recursive. It doesn’t do anything with the results of each of its recursive calls, except directly returning those results right away. This means you could replace it with a loop which would update the low and high variables while looping until the stopping condition is met.

Is recursion faster than iteration DFS?

They both work fine on files with small sizes (less than 1 MB). However, when I try to run them over files with 50 MB, it seems like that the recursive-DFS (9 secs) is much faster than that using an iterative approach (at least several minutes). In fact, the iterative approach took ages to finish.

## Is DFS iterative or recursive?

The only difference between iterative DFS and recursive DFS is that the recursive stack is replaced by a stack of nodes. Algorithm: Created a stack of nodes and visited array. Insert the root in the stack.

### Should I use tail recursion?

Tail recursion is important because it can be implemented more efficiently than general recursion. When we make a normal recursive call, we have to push the return address onto the call stack then jump to the called function. This means that we need a call stack whose size is linear in the depth of the recursive calls.

What is tail recursion give example?

What is tail recursion? A recursive function is tail recursive when a recursive call is the last thing executed by the function. For example the following C++ function print() is tail recursive.

How can we convert a non tail recursive function into a tail recursive function?

Converting recursive functions to tail-recursive ones

1. Turn the original function into a local helper function.
2. Add an accumulator argument to the helper function.
3. Change the helper function’s recursive call into a tail-recursive call; be sure to update the accumulator appropriately.

## Can a DFS traversal be done using recursion?

Given a Binary tree, Traverse it using DFS using recursion. Unlike linear data structures (Array, Linked List, Queues, Stacks, etc) which have only one logical way to traverse them, trees can be traversed in different ways. Generally there are 2 widely used ways for traversing trees: In this article, traversal using DFS has been discussed.

### Why do we care about tail recursion in C + +?

For example the following C++ function print () is tail recursive. Why do we care? The tail recursive functions considered better than non tail recursive functions as tail-recursion can be optimized by compiler.

Why is DFS traversal of a tree easier than graph?

Here backtracking is used for traversal. In this traversal first the deepest node is visited and then backtracks to it’s parent node if no sibling of that node exist. In graph, there might be cycles and dis-connectivity. Unlike graph, tree does not contain cycle and always connected. So DFS of a tree is relatively easier.

Is the factorial of n a tail recursive function?

Consider the following function to calculate factorial of n. It is a non-tail-recursive function. Although it looks like a tail recursive at first look. If we take a closer look, we can see that the value returned by fact (n-1) is used in fact (n), so the call to fact (n-1) is not the last thing done by fact (n)

23/01/2019