Added name of the problems

Author: v0di

easy/13.py

@@ -1,3 +1,5 @@
+# Roman to Integer
+
 class Solution:
     def romanToInt(self, s: str) -> int:
         nums = {

easy/20.py

@@ -1,3 +1,5 @@
+# Valid Parentheses
+
 class Solution:
     def isValid(self, s: str) -> bool:
         close = {'(':')', '[':']', '{':'}'}

hard/4.py

@@ -1,3 +1,5 @@
+# Median of Two Sorted Arrays
+
 class Solution:
     def findMedianSortedArrays(self, nums1: List[int], nums2: List[int]) -> float:
         nums = sorted(nums1 + nums2)

hard/42.py

@@ -1,3 +1,5 @@
+# Trapping Rain Water
+
 class Solution:
     def trap(self, height: List[int]) -> int:
         if len(height) == 1: return 0

medium/6.py

@@ -1,3 +1,5 @@
+# ZigZag Conversion
+
 class Solution:
     def convert(self, s: str, numRows: int) -> str:
         if numRows == 1: return s