Add Week03 pyramid and sequence assignments

Author: JustBesa

Week03/pyramid_beyza_arman.py

@@ -0,0 +1,9 @@
+def calculate_pyramid_height(blocks):
+    """Return the number of complete layers that can be built."""
+    height = 0
+    next_layer = 1
+    while blocks >= next_layer:
+        blocks -= next_layer
+        height += 1
+        next_layer += 1
+    return height

Week03/sequences_beyza_arman.py

@@ -0,0 +1,20 @@
+def remove_duplicates(items):
+    """Remove duplicates while preserving the first occurrence order."""
+    result = []
+    for item in items:
+        if item not in result:
+            result.append(item)
+    return result
+
+
+def list_counts(items):
+    """Return the frequency of each item."""
+    counts = {}
+    for item in items:
+        counts[item] = counts.get(item, 0) + 1
+    return counts
+
+
+def reverse_dict(mapping):
+    """Swap keys and values; the last key wins for repeated values."""
+    return {value: key for key, value in mapping.items()}