## Why this implementation of Fibonacci is extremely fast?

This implementation of Fibonacci is easy to understand but very slow:Following implementation of Fibonacci is hard to understand but super fast. It calculates 100,000th Fibonacci number instantly on my laptop.
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## How can modern compiler optimization convert recursion into returning a constant?

When I compile the following simple recursion code with g++, the assembly code simply returns i, as if g++ can do some algebra tricks as humans can.
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## Haskell – Recursion Stack Overflow

I am trying to sum all n from 1 to a very large number (10**9 for now) but it gives stack overflow. Also I don't think putting a stop at 1 and doing the sum n in different rows is the most efficient way but the code below is all...
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## Writing a Swift function that returns itself

I have this piece of code in Python :I'm trying to write this in Swift but can't figure out if it's possible or not. The return type would get infinitely long.
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## a to the power of b – recursive algorithm

I am having a hard time understanding the following recursive algorithm in terms of the multiplication operation used in the code.
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## recursion in array to find odd numbers and push to new variable

I tried to recursion those arrays to find odd/even numbers then push them to newArr but the result, not an array, that result is the string with numbers the result after found the odd/even numbers.
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## How does recursion work in a Java 8 Stream?

I have a method like this where I'm using recursion with Streams:Lets say a Member class has a children list of members that is always initialized to an empty list. Here what I'm doing is converting the hierarchical list of members to a flat list. I understand that part. What...
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## How recursion works in Stream java8

I have a method like this where I'm using recursion with Streams.Lets say a Member class has a children list of members that is always initialized to an empty list. Here what I'm doing is converting hierarchical list of members to a flat list. I understand that part. What I...
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## Convert hierarchical list to a flat list in java

I have a hierarchical list like below and I want to convert it to a flat list.I have wrote a method called convertToFlatList and have used it. But some elements are missing in the final results. What did i do wrong?
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## Stop the recursive function when it reaches high depth in c

I want to stop the recursive function when it reaches 3000 depth. how do I do it?When I added the counter, I tried to return it when it was 3000, but I can't say I was very successful.
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