diff --git a/container-with-most-water/mandel-17.py b/container-with-most-water/mandel-17.py
new file mode 100644
index 0000000000..8a3643134c
--- /dev/null
+++ b/container-with-most-water/mandel-17.py
@@ -0,0 +1,13 @@
+class Solution:
+    def maxArea(self, height: List[int]) -> int:  
+        max_area = 0
+        left, right = 0, len(height) - 1
+        while left < right:
+            area = (right - left) * min(height[left], height[right])
+            max_area = max(area, max_area)
+            if height[left] <= height[right]:
+                left += 1            
+            else:
+                right  -= 1
+        return max_area
+
diff --git a/valid-parentheses/mandel-17.py b/valid-parentheses/mandel-17.py
new file mode 100644
index 0000000000..c136244df8
--- /dev/null
+++ b/valid-parentheses/mandel-17.py
@@ -0,0 +1,44 @@
+class ArrayStack:
+    def __init__(self, capacity):
+        self.capacity = capacity
+        self.array = [None] * self.capacity
+        self.top = -1
+    
+    def isEmpty(self):
+        return self.top == -1
+
+    def isFull(self):
+        return self.top == self.capacity - 1
+
+    def push(self, item):
+        if not self.isFull():
+            self.top += 1
+            self.array[self.top] = item
+        else:
+            pass
+
+    def pop(self):
+        if not self.isEmpty():
+            self.top -= 1
+            return self.array[self.top+1]
+        else:
+            pass
+
+class Solution:
+    def isValid(self, s: str) -> bool:
+        stack = ArrayStack(100)
+        for ch in s:
+            if ch in ('(', '[', '{'):
+                stack.push(ch)
+            elif ch in (')', ']', '}'):
+                if stack.isEmpty():
+                    return False
+                else:
+                    left = stack.pop()
+                    if (ch == ')' and left != '(') or \
+                       (ch == ']' and left != '[') or \
+                       (ch == '}' and left != '{'):
+                           return False
+        return stack.isEmpty()
+
+