Created
July 31, 2022 13:26
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A slow... very slow sorting algorithm
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1 => 1 ------------------------------------------------------ | |
< Min 0.00001 | 1 | 0.00x | |
> Max 0.00003 | 1 | 0.00x | |
~ Avg 0.00001 | 1.0 | 0.00x | |
2 => 1 ------------------------------------------------------ | |
< Min 0.00001 | 1 | 1.00x | |
> Max 0.00030 | 30 | 29.07x | |
~ Avg 0.00004 | 8.48 | 4.17x | |
3 => 1 ------------------------------------------------------ | |
< Min 0.00003 | 2 | 0.61x | |
> Max 0.00851 | 1,464 | 194.70x | |
~ Avg 0.00119 | 191.46 | 27.29x | |
4 => 1 ------------------------------------------------------ | |
< Min 0.00155 | 151 | 1.30x | |
> Max 0.21055 | 21,929 | 176.56x | |
~ Avg 0.06305 | 6,407.3 | 52.87x | |
5 => 1 ------------------------------------------------------ | |
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import random | |
from time import perf_counter | |
from typing import Callable, List, Tuple, NoReturn | |
SortFunc = Callable[[List[int]], List[int]] | |
def unrecursify(func: SortFunc) -> SortFunc: | |
class Unrecursify(Exception): | |
pass | |
call_args: List[Tuple[int]] = [] | |
def inner(*args: int) -> NoReturn: | |
call_args.append(args) | |
raise Unrecursify() | |
def wrapper(*args: int) -> Tuple[List[int], int]: | |
bak: SortFunc = func | |
globals()[func.__name__] = inner | |
call_args.append(args) | |
while True: | |
try: | |
r = bak(*call_args[-1]) | |
globals()[func.__name__] = unrecursify(bak) | |
return r | |
except Unrecursify: | |
continue | |
return wrapper | |
@unrecursify | |
def sort(lst: List[int]) -> List[int]: | |
if not lst: # 0 length elimination | |
return lst | |
# Build a list using "last survivors" method | |
out: List[int] = [] | |
for i in range(len(lst)): | |
c_lst = lst.copy() | |
while len(c_lst) > 1: | |
i = random.randint(0, len(c_lst) - 1) | |
x, c_lst = c_lst[i], c_lst[:i] + c_lst[i + 1:] | |
out.extend(c_lst) # We extend the list by 1 each time | |
# Checking sort using min check value | |
m = out[0] | |
for i in out[1:]: | |
if i < m: | |
return sort(lst) | |
m = i | |
# Checking for the out list to be a relpica of the given list | |
c_out: List[int] = out.copy() | |
for k in lst: | |
i = random.randint(0, len(c_out) - 1) | |
x, c_out = c_out[i], c_out[:i] + c_out[i + 1:] | |
if x != k: | |
return sort(lst) | |
return out | |
def main(): | |
to_sort = [4, 3, 2, 1] | |
marker = perf_counter() | |
sorted_list = sort(to_sort) | |
elapsed = perf_counter() - marker | |
print(f'Sorted sorted_list {elapsed * 1000:,.2f}ms') | |
if __name__ == '__main__': | |
main() |
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