added two_num.py, [ques]Sum of 2 numbers being a given target.

Author: anuragkumarak95

two_num.py

@@ -0,0 +1,23 @@
+"""Author Anurag Kumar (mailto:anuragkumarak95@gmail.com)
+
+Given an array of integers, return indices of the two numbers such that they add up to a specific target.
+You may assume that each input would have exactly one solution, and you may not use the same element twice.
+
+Example:
+Given nums = [2, 7, 11, 15], target = 9,
+Because nums[0] + nums[1] = 2 + 7 = 9,
+return [0, 1].
+
+"""
+
+def twoSum(nums, target):
+    chk_map = {}
+    for index, val in enumerate(nums):
+      compl = target - val
+      if compl in chk_map: 
+        indices = [chk_map[compl], index]
+        print(indices)
+        return [indices]
+      else:
+        chk_map[val] = index
+return False