diff --git a/problem1.py b/problem1.py
new file mode 100644
index 00000000..b02901e8
--- /dev/null
+++ b/problem1.py
@@ -0,0 +1,19 @@
+
+# https://leetcode.com/problems/two-sum/description/
+
+class Solution(object):
+    def twoSum(self, nums, target):
+        """
+        :type nums: List[int]
+        :type target: int
+        :rtype: List[int]
+        """
+        dict_field={}
+        for i in range(len(nums)):
+            if nums[i] in dict_field:
+                dict_field[nums[i]].append(i)
+                return dict_field[nums[i]]
+            val = target-nums[i] 
+            dict_field[val] = [i]
+        return []
+            
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