leetcode

leetcode/13.py

@@ -0,0 +1,16 @@
+class Solution:
+    def romanToInt(self, s: str) -> int:
+        sv={'M':1000,'D':500,'C':100,'L':50,'X':10,'V':5,'I':1}
+        msv={'C':set(['D','M']),'X':set(['L','C']),'I':set(['V','X'])}
+        r=0
+        mc=''
+
+        for c in s:
+            r+=sv[c]
+            if mc in msv and c in msv[mc]:
+                r-=(sv[mc]*2)
+            if c in msv:
+                mc=c
+            else:
+                mc=''
+        return r