diff --git a/src/roman_converter/zaccagnino_from_roman.py b/src/roman_converter/zaccagnino_from_roman.py
new file mode 100644
index 0000000..3a4e223
--- /dev/null
+++ b/src/roman_converter/zaccagnino_from_roman.py
@@ -0,0 +1,28 @@
+def roman_to_int_comparison(s: str) -> int:
+    roman_map = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
+    num = 0
+    for i in range(len(s)):
+        if i + 1 < len(s) and roman_map[s[i]] < roman_map[s[i+1]]:
+            num -= roman_map[s[i]]
+        else:
+            num += roman_map[s[i]]
+    return num
+
+def romanToInt_reverse(s: str) -> int:
+    roman_map = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
+    integer, previous_value = 0, 0
+    for ch in reversed(s):
+        current_value = roman_map[ch]
+        if current_value < previous_value:
+            integer -= current_value
+        else:
+            integer += current_value
+        previous_value = current_value
+    return integer 
+
+def romanToInt_replace(s: str) -> int:
+    roman_map = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}
+    s = s.replace("IV", "IIII").replace("IX", "VIIII")
+    s = s.replace("XL", "XXXX").replace("XC", "LXXXX")
+    s = s.replace("CD", "CCCC").replace("CM", "DCCCC")
+    return sum(roman_map[x] for x in s)
diff --git a/src/roman_converter/zaccagnino_to_roman.py b/src/roman_converter/zaccagnino_to_roman.py
new file mode 100644
index 0000000..830fedd
--- /dev/null
+++ b/src/roman_converter/zaccagnino_to_roman.py
@@ -0,0 +1,62 @@
+def to_roman1(arabic: int) -> str:
+    if not 0 < arabic < 4000:
+        return "Input must be between 1 and 3999"
+        
+    roman_mapping = [
+        (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 roman_mapping:
+        count = arabic // value
+        result += numeral * count
+        arabic %= value
+        
+    return result
+
+def arabic_to_roman_greedy(n: int) -> str:
+    """Greedy mapping implementation. Supports 1..3999."""
+    if not isinstance(n, int):
+        raise TypeError("n must be int")
+    if n <= 0 or n >= 4000:
+        raise ValueError("n must be between 1 and 3999")
+    vals = [
+        (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"),
+    ]
+    res = []
+    for val, sym in vals:
+        count, n = divmod(n, val)
+        res.append(sym * count)
+        if n == 0:
+            break
+    return "".join(res)
+
+
+def arabic_to_roman_table(n: int) -> str:
+    """Table-driven implementation using digit breakdown. Supports 1..3999."""
+    if not isinstance(n, int):
+        raise TypeError("n must be int")
+    if n <= 0 or n >= 4000:
+        raise ValueError("n must be between 1 and 3999")
+    thousands = ["", "M", "MM", "MMM"]
+    hundreds = ["", "C", "CC", "CCC", "CD", "D", "DC", "DCC", "DCCC", "CM"]
+    tens = ["", "X", "XX", "XXX", "XL", "L", "LX", "LXX", "LXXX", "XC"]
+    ones = ["", "I", "II", "III", "IV", "V", "VI", "VII", "VIII", "IX"]
+    return (
+        thousands[(n // 1000) % 10]
+        + hundreds[(n // 100) % 10]
+        + tens[(n // 10) % 10]
+        + ones[n % 10]
+    )
+
+
+
+
+
+
+
+
diff --git a/tests/roman_converter/zaccagnino/tests_zaccagnino_from_roman.py b/tests/roman_converter/zaccagnino/tests_zaccagnino_from_roman.py
new file mode 100644
index 0000000..9fc9938
--- /dev/null
+++ b/tests/roman_converter/zaccagnino/tests_zaccagnino_from_roman.py
@@ -0,0 +1,22 @@
+from types import ModuleType
+
+def test_roman_to_int_comparison(impl: ModuleType):
+    assert impl.roman_to_int_comparison("I") == 1
+    assert impl.roman_to_int_comparison("IV") == 4
+    assert impl.roman_to_int_comparison("XXVI") == 26
+    assert impl.roman_to_int_comparison("MDCLXVI") == 1666
+    assert impl.roman_to_int_comparison("MMMCMXCIX") == 3999
+
+def romanToInt_reverse(impl: ModuleType):
+    assert impl.romanToInt_reverse("I") == 1
+    assert impl.romanToInt_reverse("IV") == 4
+    assert impl.romanToInt_reverse("XXVI") == 26
+    assert impl.romanToInt_reverse("MDCLXVI") == 1666
+    assert impl.romanToInt_reverse("MMMCMXCIX") == 3999
+
+def test_romanToInt_replace(impl: ModuleType):
+    assert impl.romanToInt_replace("I") == 1
+    assert impl.romanToInt_replace("IV") == 4
+    assert impl.romanToInt_replace("XXVI") == 26
+    assert impl.romanToInt_replace("MDCLXVI") == 1666
+    assert impl.romanToInt_replace("MMMCMXCIX") == 3999
\ No newline at end of file
diff --git a/tests/roman_converter/zaccagnino/tests_zaccagnino_to_roman.py b/tests/roman_converter/zaccagnino/tests_zaccagnino_to_roman.py
new file mode 100644
index 0000000..dbc700a
--- /dev/null
+++ b/tests/roman_converter/zaccagnino/tests_zaccagnino_to_roman.py
@@ -0,0 +1,23 @@
+from types import ModuleType
+
+
+def test_to_roman1(impl: ModuleType):
+    assert impl.to_roman1(1) == "I"
+    assert impl.to_roman1(52) == "LII"
+    assert impl.to_roman1(176) == "CLXXVI"
+    assert impl.to_roman1(1256) == "MCCLVI"
+    assert impl.to_roman1(3999) == "MMMCMXCIX"
+
+def test_arabic_to_roman_greedy(impl: ModuleType):
+    assert impl.arabic_to_roman_greedy(1) == "I"
+    assert impl.arabic_to_roman_greedy(52) == "LII"
+    assert impl.arabic_to_roman_greedy(176) == "CLXXVI"
+    assert impl.arabic_to_roman_greedy(1256) == "MCCLVI"
+    assert impl.arabic_to_roman_greedy(3999) == "MMMCMXCIX"
+
+def test_arabic_to_roman_table(impl: ModuleType):
+    assert impl.arabic_to_roman_table(1) == "I"
+    assert impl.arabic_to_roman_table(52) == "LII"
+    assert impl.arabic_to_roman_table(176) == "CLXXVI"
+    assert impl.arabic_to_roman_table(1256) == "MCCLVI"
+    assert impl.arabic_to_roman_table(3999) == "MMMCMXCIX"
\ No newline at end of file