diff --git a/submissions/KrishnaSingh/BuyAndSellStock/Screenshot 2025-07-05 213908.png b/submissions/KrishnaSingh/BuyAndSellStock/Screenshot 2025-07-05 213908.png
new file mode 100644
index 0000000..ba1dad8
Binary files /dev/null and b/submissions/KrishnaSingh/BuyAndSellStock/Screenshot 2025-07-05 213908.png differ
diff --git a/submissions/KrishnaSingh/BuyAndSellStock/Solution.py b/submissions/KrishnaSingh/BuyAndSellStock/Solution.py
new file mode 100644
index 0000000..30f1aaa
--- /dev/null
+++ b/submissions/KrishnaSingh/BuyAndSellStock/Solution.py
@@ -0,0 +1,18 @@
+class Solution:
+    def maxProfit(self, prices):
+        """
+        :type prices: List[int]
+        :rtype: int
+        """
+        min_price = float('inf')
+        max_profit = 0
+
+        for price in prices:
+            if price < min_price:
+                min_price = price
+            else:
+                profit = price - min_price
+                if profit > max_profit:
+                    max_profit = profit
+
+        return max_profit
diff --git a/submissions/KrishnaSingh/BuyAndSellStock/desktop.ini b/submissions/KrishnaSingh/BuyAndSellStock/desktop.ini
new file mode 100644
index 0000000..442090b
--- /dev/null
+++ b/submissions/KrishnaSingh/BuyAndSellStock/desktop.ini
@@ -0,0 +1,2 @@
+[LocalizedFileNames]
+Screenshot 2025-07-05 213908.png=@Screenshot 2025-07-05 213908,0
diff --git a/submissions/KrishnaSingh/RunningSumOf1dArray/Screenshot 2025-07-05 213942.png b/submissions/KrishnaSingh/RunningSumOf1dArray/Screenshot 2025-07-05 213942.png
new file mode 100644
index 0000000..de2a723
Binary files /dev/null and b/submissions/KrishnaSingh/RunningSumOf1dArray/Screenshot 2025-07-05 213942.png differ
diff --git a/submissions/KrishnaSingh/RunningSumOf1dArray/Solution.py b/submissions/KrishnaSingh/RunningSumOf1dArray/Solution.py
new file mode 100644
index 0000000..f6cb432
--- /dev/null
+++ b/submissions/KrishnaSingh/RunningSumOf1dArray/Solution.py
@@ -0,0 +1,14 @@
+class Solution(object):
+    def runningSum(self, nums):
+        """
+        :type nums: List[int]
+        :rtype: List[int]
+        """
+        result = []
+        current_sum = 0
+
+        for num in nums:
+            current_sum += num
+            result.append(current_sum)
+
+        return result
diff --git a/submissions/KrishnaSingh/RunningSumOf1dArray/desktop.ini b/submissions/KrishnaSingh/RunningSumOf1dArray/desktop.ini
new file mode 100644
index 0000000..f27f932
--- /dev/null
+++ b/submissions/KrishnaSingh/RunningSumOf1dArray/desktop.ini
@@ -0,0 +1,2 @@
+[LocalizedFileNames]
+Screenshot 2025-07-05 213942.png=@Screenshot 2025-07-05 213942,0