Add files via upload

Author: assassint2017

Add Strings/Add_Strings.py

@@ -0,0 +1,22 @@
+# 基本思路，按位相加
+# 60ms 67.76%
+class Solution:
+    def addStrings(self, num1, num2):
+        """
+        :type num1: str
+        :type num2: str
+        :rtype: str
+        """
+        res_list, carry = [], 0
+        num1, num2 = list(num1), list(num2)
+        while num1 or num2:
+            n1 = ord(num1.pop()) - ord('0') if num1 else 0
+            n2 = ord(num2.pop()) - ord('0') if num2 else 0
+
+            temp = n1 + n2 + carry
+            res_list.append(str(temp % 10))
+            carry = temp // 10
+
+        if carry is not 0:
+            res_list.append(str(carry))
+        return ''.join(res_list[::-1])