From f22fe4812d8816c96271b1213963e8d8c649c48a Mon Sep 17 00:00:00 2001
From: NA-V10 <naveensbsf123@gmail.com>
Date: Fri, 21 Nov 2025 16:24:50 +0530
Subject: [PATCH 1/2] feat: add count_bits algorithm with doctests

---
 bit_manipulation/count_bits.py | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 bit_manipulation/count_bits.py

diff --git a/bit_manipulation/count_bits.py b/bit_manipulation/count_bits.py
new file mode 100644
index 000000000000..e5d36c94eba2
--- /dev/null
+++ b/bit_manipulation/count_bits.py
@@ -0,0 +1,31 @@
+def count_bits(n: int) -> int:
+    """
+    Count the number of set bits (1s) in the binary representation of a
+    non-negative integer.
+
+    Examples:
+    >>> count_bits(0)
+    0
+    >>> count_bits(1)
+    1
+    >>> count_bits(5)  # 101
+    2
+    >>> count_bits(15)  # 1111
+    4
+    >>> count_bits(16)  # 10000
+    1
+    """
+    if n < 0:
+        raise ValueError("Input must be non-negative")
+
+    count = 0
+    while n > 0:
+        count += n & 1
+        n >>= 1
+
+    return count
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()

From 7aef9f9a27043c7f9ae2cfc8a928c44bbf1a13e6 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Fri, 21 Nov 2025 10:55:49 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 bit_manipulation/count_bits.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/bit_manipulation/count_bits.py b/bit_manipulation/count_bits.py
index e5d36c94eba2..cebd165b4da1 100644
--- a/bit_manipulation/count_bits.py
+++ b/bit_manipulation/count_bits.py
@@ -28,4 +28,5 @@ def count_bits(n: int) -> int:
 
 if __name__ == "__main__":
     import doctest
+
     doctest.testmod()