Python: maximum recursion depth exceeded while calling a Python object
this turns the recursion in to a loop:
recursion
Exception in thread “main” java.lang.StackOverflowError
Your algorithm is fine. However int is too small for your computations, it fails for this input: At some point integer overflows to negative value and your implementation goes crazy, recursing infinitely. Change int num to long num and you’ll be fine – for some time. Later you’ll need BigInteger. Note that according to Wikipedia on Collatz conjecture (bold mine): The longest progression for … Read more
Python: maximum recursion depth exceeded while calling a Python object
this turns the recursion in to a loop:
how to implement quick sort algorithm in C++
Your consideration is wrong. The value of r does not change, since it is given as value to the Quicksort function(not a reference). You handle the ranges with p,q such that p is the first index in the range and q the first index not in the range. Thus, your calls were wrong: Here is the complete example. I used std::swap to change elements and ans std::vector … Read more
What is the maximum recursion depth in Python, and how to increase it?
It is a guard against a stack overflow, yes. Python (or rather, the CPython implementation) doesn’t optimize tail recursion, and unbridled recursion causes stack overflows. You can check the recursion limit with sys.getrecursionlimit: and change the recursion limit with sys.setrecursionlimit: but doing so is dangerous — the standard limit is a little conservative, but Python … Read more
What is the maximum recursion depth in Python, and how to increase it?
It is a guard against a stack overflow, yes. Python (or rather, the CPython implementation) doesn’t optimize tail recursion, and unbridled recursion causes stack overflows. You can check the recursion limit with sys.getrecursionlimit: and change the recursion limit with sys.setrecursionlimit: but doing so is dangerous — the standard limit is a little conservative, but Python … Read more
What is tail recursion?
Consider a simple function that adds the first N natural numbers. (e.g. sum(5) = 0 + 1 + 2 + 3 + 4 + 5 = 15). Here is a simple JavaScript implementation that uses recursion: If you called recsum(5), this is what the JavaScript interpreter would evaluate: Note how every recursive call has to complete before … Read more