diff --git a/container-with-most-water/doh6077.py b/container-with-most-water/doh6077.py
new file mode 100644
index 000000000..907db9516
--- /dev/null
+++ b/container-with-most-water/doh6077.py
@@ -0,0 +1,16 @@
+# 11. Container With Most Water
+
+# Use two pointesr 
+class Solution:
+    def maxArea(self, height: List[int]) -> int:
+        left, right = 0, len(height) -1 
+        container = 0 
+
+        while left < right:
+            cal = ((right - left) * min(height[left], height[right]))
+            container = max(container, cal)
+            if height[left] > height[right]:
+                right -= 1
+            else:
+                left += 1
+        return container 
diff --git a/valid-parentheses/doh6077.py b/valid-parentheses/doh6077.py
new file mode 100644
index 000000000..483b76cae
--- /dev/null
+++ b/valid-parentheses/doh6077.py
@@ -0,0 +1,16 @@
+# Use stack and Hashmap 
+class Solution:
+    def isValid(self, s: str) -> bool:
+        match = {")": "(", "}": "{", "]": "["}
+        stack = []
+
+        for ch in s:
+            if ch in match:
+                if stack and stack[-1] == match[ch]:
+                    stack.pop()
+                else:
+                    return False 
+            else:
+                stack.append(ch)
+        return True if not stack else False
+