Added two sum

Author: shichao-an

two_sum/solution.py

@@ -0,0 +1,8 @@
+class Solution:
+    # @return a tuple, (index1, index2)
+    def twoSum(self, num, target):
+        d = {}
+        for i, e in enumerate(num):
+            if e in d:
+                return d[e] + 1, i + 1
+            d[target - e] = i