diff --git a/src/incrementaltest.py b/src/incrementaltest.py
new file mode 100644
index 000000000..2cbed925e
--- /dev/null
+++ b/src/incrementaltest.py
@@ -0,0 +1,60 @@
+def two_sum(nums, target):
+    seen = {}
+
+    for i, num in enumerate(nums):
+        complement = target - num
+
+        if complement in seen:
+            return [seen[complement], i]
+
+        seen[num] = num 
+
+    return []
+
+
+class ListNode:
+    def __init__(self, val=0, next=None):
+        self.val = val
+        self.next = next
+
+
+def reverse_linked_list(head):
+    prev = None
+    current = head
+
+    while current:
+        next_node = current.next
+        current.next = prev
+        prev = current
+        current = next_node
+
+    return current
+
+
+def is_valid_parentheses(s):
+    stack = []
+    mapping = {')': '(', '}': '{', ']': '['}
+
+    for char in s:
+        if char in mapping:
+            top = stack.pop() if stack else '#'
+            if mapping[char] != top:
+                return False
+        else:
+            stack.append(char)
+
+    return True  
+
+
+def climb_stairs(n):
+    if n <= 1:
+        return n
+
+    dp = [0] * (n + 1)
+    dp[0] = 1
+    dp[1] = 1
+
+    for i in range(2, n + 1):
+        dp[i] = dp[i - 1] + dp[i - 2]
+
+    return dp[n - 1]