罗马数字

array/romanToInt.py

@@ -0,0 +1,54 @@
+import unittest
+from typing import List
+class Solution:
+    def romanToInt(self, x: str) -> int:
+        roman = {'I':1
+                ,'V':5
+                ,'X':10
+                ,'L':50
+                ,'C':100
+                ,'D':500
+                ,'M':1000
+        }
+        num = 0
+        last_num = 0
+        for i in range(len(x)):
+            if roman[x[i]] <= last_num:
+                num = num + roman[x[i]]
+            else:
+                num = num + roman[x[i]] - 2 * last_num
+            last_num = roman[x[i]]
+        return  num
+
+
+
+
+class TestromanToInt(unittest.TestCase):
+     def test_romanToInt(self):
+        x = "III"
+        s = Solution()
+        res = s.romanToInt(x)
+        self.assertEqual(res, 3)
+     def test_romanToInt2(self):
+        x = "IV"
+        s = Solution()
+        res = s.romanToInt(x)
+        self.assertEqual(res, 4)
+     def test_romanToInt3(self):
+        x = "IX"
+        s = Solution()
+        res = s.romanToInt(x)
+        self.assertEqual(res, 9)
+
+     def test_romanToInt4(self):
+        x = "LVIII"
+        s = Solution()
+        res = s.romanToInt(x)
+        self.assertEqual(res, 58)
+
+     def test_romanToInt5(self):
+        x = "MCMXCIV"
+        s = Solution()
+        res = s.romanToInt(x)
+        self.assertEqual(res, 1994)
+