Create longest-common-pref.py

neat enough solution for longest common prefix

longest-common-pref.py

@@ -0,0 +1,13 @@
+class Solution:
+    def longestCommonPrefix(self, strs: List[str]) -> str:
+        pref = strs[0]
+        for s in strs:
+            if pref == "":
+                return pref
+            for i in range(min(len(s),len(pref))):
+                if s[i] != pref[i]:
+                    pref = pref[:i]
+                    break
+            if len(pref) > len(s):
+                pref = pref[:len(s)]
+        return pref