Handle gcd(0, 0) edge case (#14215)

yaadhuu · pre-commit-ci[bot] · MaximSmolskiy · web-flow · commit 84b59c878186 · 2026-03-09T07:08:51.000+03:00
* Use TypeError for non-string input in count_vowels * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Fix docstring and improve input validation in kth_lexicographic_permutation * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Handle gcd(0, 0) edge case * Update kth_lexicographic_permutation.py * Update count_vowels.py * Update greatest_common_divisor.py --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>
diff --git a/maths/greatest_common_divisor.py b/maths/greatest_common_divisor.py
@@ -30,6 +30,8 @@ def greatest_common_divisor(a: int, b: int) -> int:
     3
     >>> greatest_common_divisor(-3, -9)
     3
+    >>> greatest_common_divisor(0, 0)
+    0
     """
     return abs(b) if a == 0 else greatest_common_divisor(b % a, a)
 
@@ -50,6 +52,8 @@ def gcd_by_iterative(x: int, y: int) -> int:
     1
     >>> gcd_by_iterative(11, 37)
     1
+    >>> gcd_by_iterative(0, 0)
+    0
     """
     while y:  # --> when y=0 then loop will terminate and return x as final GCD.
         x, y = y, x % y

Original file line number	Diff line number	Diff line change
`@@ -30,6 +30,8 @@ def greatest_common_divisor(a: int, b: int) -> int:`
`30`	`30`	`3`
`31`	`31`	`>>> greatest_common_divisor(-3, -9)`
`32`	`32`	`3`
	`33`	`+ >>> greatest_common_divisor(0, 0)`
	`34`	`+ 0`
`33`	`35`	`"""`
`34`	`36`	`return abs(b) if a == 0 else greatest_common_divisor(b % a, a)`
`35`	`37`
`@@ -50,6 +52,8 @@ def gcd_by_iterative(x: int, y: int) -> int:`
`50`	`52`	`1`
`51`	`53`	`>>> gcd_by_iterative(11, 37)`
`52`	`54`	`1`
	`55`	`+ >>> gcd_by_iterative(0, 0)`
	`56`	`+ 0`
`53`	`57`	`"""`
`54`	`58`	`while y: # --> when y=0 then loop will terminate and return x as final GCD.`
`55`	`59`	`x, y = y, x % y`