diff --git a/martinoywa/C1.py b/martinoywa/C1.py
new file mode 100644
index 00000000..dc5f504b
--- /dev/null
+++ b/martinoywa/C1.py
@@ -0,0 +1,17 @@
+def reversed(n):
+    # check if number is -
+    negative = n < 0
+
+    # convert to sting and reverse
+    n_reversed = int(str(abs(n))[::-1])
+
+    # add - if negative
+    n_reversed *= (-1 if negative else 1)
+    return n_reversed
+
+
+if __name__ == "__main__":
+    print(f"500: {reversed(500)} == 5")
+    print(f"-56: {reversed(-56)} == -65")
+    print(f"-90: {reversed(-90)} == -9")
+    print(f"91: {reversed(91)} == 19")
diff --git a/martinoywa/C2.py b/martinoywa/C2.py
new file mode 100644
index 00000000..9a66352b
--- /dev/null
+++ b/martinoywa/C2.py
@@ -0,0 +1,14 @@
+def fizz_buzz():
+    for i in range(1, 101):
+        if i % 3 == 0 and i % 5 == 0:
+            print("FizzBuzz")
+        elif i % 3 == 0:
+            print("Fizz")
+        elif i % 5 == 0:
+            print("Buzz")
+        else:
+            print(i)
+
+
+if __name__ == "__main__":
+    fizz_buzz()
diff --git a/martinoywa/C3.py b/martinoywa/C3.py
new file mode 100644
index 00000000..85ba1d6c
--- /dev/null
+++ b/martinoywa/C3.py
@@ -0,0 +1,15 @@
+from math import log2
+
+
+def power_of_two(n):
+    # edge case
+    if n <= 0:
+        return False
+    return log2(n) == int(log2(n))
+
+
+if __name__ == "__main__":
+    print(f"-1 => {power_of_two(-1)}")
+    print(f"0 => {power_of_two(0)}")
+    print(f"8 => {power_of_two(8)}")
+    print(f"6 => {power_of_two(6)}")
diff --git a/martinoywa/priority_queue.py b/martinoywa/priority_queue.py
new file mode 100644
index 00000000..cae1ea8f
--- /dev/null
+++ b/martinoywa/priority_queue.py
@@ -0,0 +1,17 @@
+import heapq
+
+
+def priority_queue(tasks):
+    output = []
+
+    tasks = [(p, n) for n, p in tasks] # swap order of task name and priority
+    heapq.heapify(tasks) # create a min-heap
+    
+    while tasks:
+        output.append(heapq.heappop(tasks)[1])
+    
+    return output
+
+if __name__ == "__main__":
+    output = priority_queue([("task1", 2), ("task2", 1), ("task3", 3)])
+    print(*output, sep=" ")
diff --git a/martinoywa/reverse_linked_list.py b/martinoywa/reverse_linked_list.py
new file mode 100644
index 00000000..26353eab
--- /dev/null
+++ b/martinoywa/reverse_linked_list.py
@@ -0,0 +1,32 @@
+from helpers.linked_list_helpers import *
+
+
+def reverse_linked_list(head):
+    prev, after, current = None, None, head
+
+    while current:
+        after = current.next
+        current.next = prev
+        prev = current
+        current = after
+
+    return prev
+
+
+if __name__ == "__main__":
+    # create the LL
+    LL = ListNode(1)
+    current = LL
+    for _ in range(2, 6):
+        current.next = ListNode(_)
+        current = current.next
+    
+    print("Before Reverse")
+    print_linked_list(LL)
+    print()
+
+    print("After Reverse")
+    LL_rev = reverse_linked_list(LL)
+    print_linked_list(LL_rev)
+    print()
+    
\ No newline at end of file