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 836864c51bc7d3a35bf9be204492c0f4452b1261 Mon Sep 17 00:00:00 2001
From: NA-V10 <naveensbsf123@gmail.com>
Date: Fri, 21 Nov 2025 16:50:56 +0530
Subject: [PATCH 2/2] feat: add integer_to_roman algorithm with doctests

---
 strings/integer_to_roman.py | 51 +++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 strings/integer_to_roman.py

diff --git a/strings/integer_to_roman.py b/strings/integer_to_roman.py
new file mode 100644
index 000000000000..023cc6608742
--- /dev/null
+++ b/strings/integer_to_roman.py
@@ -0,0 +1,51 @@
+def integer_to_roman(n: int) -> str:
+    """
+    Convert an integer to a Roman numeral.
+
+    Examples:
+    >>> integer_to_roman(1)
+    'I'
+    >>> integer_to_roman(4)
+    'IV'
+    >>> integer_to_roman(9)
+    'IX'
+    >>> integer_to_roman(58)
+    'LVIII'
+    >>> integer_to_roman(1994)
+    'MCMXCIV'
+    >>> integer_to_roman(0)
+    Traceback (most recent call last):
+        ...
+    ValueError: number must be between 1 and 3999
+    """
+    if not (1 <= n <= 3999):
+        raise ValueError("number must be between 1 and 3999")
+
+    symbols = [
+        (1000, "M"),
+        (900, "CM"),
+        (500, "D"),
+        (400, "CD"),
+        (100, "C"),
+        (90, "XC"),
+        (50, "L"),
+        (40, "XL"),
+        (10, "X"),
+        (9, "IX"),
+        (5, "V"),
+        (4, "IV"),
+        (1, "I"),
+    ]
+
+    result = []
+    for value, numeral in symbols:
+        while n >= value:
+            result.append(numeral)
+            n -= value
+
+    return "".join(result)
+
+
+if __name__ == "__main__":
+    import doctest
+    doctest.testmod()