Merge pull request doocs#201 from FatEagle/master

A pythonic solution for 0002

Author: yanglbme

solution/0002.Add Two Numbers/Solution2.py

@@ -0,0 +1,16 @@
+class Solution:
+    """
+    This solution is from: https://leetcode.com/problems/add-two-numbers/discuss/1102/Python-for-the-win
+    A very Pythonic solution, coooooool!
+    Runtime: 76 ms, faster than 84.66% of Python3 online submissions for Add Two Numbers.
+    Memory Usage: 13.3 MB, less than 38.91% of Python3 online submissions for Add Two Numbers.
+    """
+    def addTwoNumbers(self, l1, l2):
+        def toint(node):
+            return node.val + 10 * toint(node.next) if node else 0
+        def tolist(n):
+            node = ListNode(n % 10)
+            if n > 9:
+                node.next = tolist(n // 10)
+            return node
+        return tolist(toint(l1) + toint(l2))

solution/README.md

@@ -19,6 +19,7 @@
 │   ├── Solution.js
 │   ├── Solution.py
 │   ├── Solution.rb
+│   ├── Solution2.py
 │   └── Solution2.js
 ├── 0003.Longest Substring Without Repeating Characters
 │   ├── README.md
@@ -1274,4 +1275,4 @@
 ├── 5087.Letter Tile Possibilities
 │   └── Solution.py
 └── README.md
-```
+```