adding algo

src/my_project/interviews/top_150_questions_round_22/ex_17_roman_to_integer.py

@@ -0,0 +1,21 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def romanToInt(self, s: str) -> int:
+
+        roman_to_dict = {'I':1,'V':5,'X':10,'L':50,'C':100,'D':500,'M':1000}
+
+        len_s = len(s)
+
+        answer = roman_to_dict[s[len_s - 1]]
+
+        for i in range(len_s - 1):
+
+            if roman_to_dict[s[len_s - 2 - i]] \
+                    < roman_to_dict[s[len_s - 1 - i]]:
+                answer -= roman_to_dict[s[len_s - 2 - i]]
+            else: 
+                answer += roman_to_dict[s[len_s - 2 - i]]
+
+        return answer

src/my_project/interviews/top_150_questions_round_22/ex_18_integer_to_roman.py

@@ -0,0 +1,26 @@
+from typing import List, Union, Collection, Mapping, Optional
+from abc import ABC, abstractmethod
+
+class Solution:
+    def intToRoman(self, num: int) -> str:
+        # Creating Dictionary for Lookup
+        num_map = {
+            1: "I",
+            5: "V",    4: "IV",
+            10: "X",   9: "IX",
+            50: "L",   40: "XL",
+            100: "C",  90: "XC",
+            500: "D",  400: "CD",
+            1000: "M", 900: "CM",
+        }
+
+        # Result Variable
+        r = ''
+
+
+        for n in [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]:
+            # If n in list then add the roman value to result variable
+            while n <= num:
+                r += num_map[n]
+                num-=n
+        return r

tests/test_150_questions_round_22/test_17_roman_to_integer_round_22.py

@@ -0,0 +1,17 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_17_roman_to_integer import Solution
+
+class RomanToIntegerTestCase(unittest.TestCase):
+
+    def test_patter_one(self):
+        solution = Solution()
+        output = solution.romanToInt(s='VII')
+        target = 7
+        self.assertEqual(output, target)
+
+    def test_patter_two(self):
+        solution = Solution()
+        output = solution.romanToInt(s='IX')
+        target = 9
+        self.assertEqual(output, target)

tests/test_150_questions_round_22/test_18_integer_to_roman_round_22.py

@@ -0,0 +1,17 @@
+import unittest
+from src.my_project.interviews.top_150_questions_round_22\
+.ex_18_integer_to_roman import Solution
+
+class IntegerToRomanTestCase(unittest.TestCase):
+
+    def test_patter_one(self):
+        solution = Solution()
+        output = solution.intToRoman(num = 3749)
+        target = "MMMDCCXLIX"
+        self.assertEqual(output, target)
+
+    def test_patter_two(self):
+        solution = Solution()
+        output = solution.intToRoman(num = 58)
+        target = "LVIII"
+        self.assertEqual(output, target)