diff --git a/problems/0001-two-sum/solution.py b/problems/0001-two-sum/solution.py
new file mode 100644
index 0000000..938ccbb
--- /dev/null
+++ b/problems/0001-two-sum/solution.py
@@ -0,0 +1,8 @@
+class Solution:
+    def twoSum(self, nums: list[int], target: int) -> list[int]:
+        hashmap = {}
+        for i, n in enumerate(nums):
+            if target - n in hashmap:
+                return [hashmap[target - n], i]
+            hashmap[n] = i
+        return []
diff --git a/problems/0001-two-sum/solution_test.py b/problems/0001-two-sum/solution_test.py
new file mode 100644
index 0000000..5537572
--- /dev/null
+++ b/problems/0001-two-sum/solution_test.py
@@ -0,0 +1,14 @@
+import pytest
+from solution import Solution
+
+
+@pytest.mark.parametrize(
+    "nums,target,expected",
+    [
+        ([2, 7, 11, 15], 9, [0, 1]),
+        ([3, 2, 4], 6, [1, 2]),
+        ([3, 3], 6, [0, 1]),
+    ],
+)
+def test_two_sum(nums, target, expected):
+    assert Solution().twoSum(nums, target) == expected