diff --git a/buy_and_sell_stocks/buy-sell-stocks.py b/buy_and_sell_stocks/buy-sell-stocks.py
new file mode 100644
index 0000000..9a9c601
--- /dev/null
+++ b/buy_and_sell_stocks/buy-sell-stocks.py
@@ -0,0 +1,13 @@
+from typing import List
+
+
+class Solution:
+    def maxProfit(self, prices: List[int]) -> int:
+        lowest_price = prices[0]
+        max_profit = 0
+        for price in prices:
+            if price < lowest_price:
+                lowest_price = price
+            elif price - lowest_price > max_profit:
+                max_profit = price - lowest_price
+        return max_profit
diff --git a/two-sum/two-sum.py b/two-sum/two-sum.py
new file mode 100644
index 0000000..c3584a3
--- /dev/null
+++ b/two-sum/two-sum.py
@@ -0,0 +1,12 @@
+from typing import List
+
+
+class Solution:
+    def twoSum(self, nums: List[int], target: int) -> List[int]:
+        answer: List[int] = []
+        for i in range(len(nums)):
+            for j in range(len(nums)):
+                if nums[i] + nums[j] == target and i != j:
+                    answer.append(i)
+                    answer.append(j)
+                    return answer