first problems

easy/1 Two Sum/solution.py

@@ -0,0 +1,19 @@
+from typing import List
+
+class Solution:
+    def twoSum(self, nums: List[int], target: int) -> List[int]:
+        for i in range(len(nums)):
+            for j in range(i + 1, len(nums)):
+                if nums[i] + nums[j] == target:
+                    return [i, j]
+
+    def twoSum_better(self, nums: List[int], target: int) -> List[int]:
+        num_dict = {}
+
+        for i in range(len(nums)):
+            complement = target - nums[i]
+            if complement in num_dict:
+                return [num_dict[complement], i]
+            else:
+                num_dict[nums[i]] = i
+        return []