diff --git a/laptopalloc.py b/laptopalloc.py
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+++ b/laptopalloc.py
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+#import Python tools for structured data (dataclass), enumerations (Enum), and type hints (List, Dict)
+from dataclasses import dataclass
+from enum import Enum
+from typing import List, Dict
+
+#Define a fixed set of operating systems as an enum to avoid typos and enforce valid values
+class OperatingSystem(Enum):
+    MACOS = "macOS"
+    ARCH = "Arch Linux"
+    UBUNTU = "Ubuntu"
+#Rep a person with a name, age, and ordered preferences of operating systems(immutable)
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    preferred_operating_system: tuple[OperatingSystem, ...]
+
+#Repr a laptop with identifying info, screen size, and its operating system
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+
+#Main function to assign exactly one laptop per person while minimizing “sadness”
+def allocate_laptops(people: List[Person], laptops: List[Laptop]) -> Dict[Person, Laptop]:
+    allocations: Dict[Person, Laptop] = {}  # store which laptop each person gets
+    allocated_laptops = set()
+    for person in people:
+        # Try preferred operating systems in order
+        for preferred_os in person.preferred_operating_system:
+            # find the first unallocated laptop with this OS
+            laptop = next(
+                (l for l in laptops if l.operating_system == preferred_os and l.id not in allocated_laptops),
+                None
+            )
+            if laptop:
+                allocations[person] = laptop
+                allocated_laptops.add(laptop.id)
+                break  # stop checking once a laptop is assigned
+
+        # Fallback: if no preferred OS laptop is available, assign any remaining laptop
+        if person not in allocations:
+            for laptop in laptops:
+                if laptop.id not in allocated_laptops:
+                    allocations[person] = laptop
+                    allocated_laptops.add(laptop.id)
+                    break
+
+    return allocations
+
+
+people = [
+    Person("Imran", 22, (OperatingSystem.UBUNTU, OperatingSystem.ARCH, OperatingSystem.MACOS)),
+    Person("Eliza", 34, (OperatingSystem.ARCH, OperatingSystem.UBUNTU)),
+]
+laptops = [
+    Laptop(1, "Dell", "XPS 13", 13, OperatingSystem.ARCH),
+    Laptop(2, "Apple", "MacBook", 13, OperatingSystem.MACOS),
+    Laptop(3, "Dell", "XPS 15", 15, OperatingSystem.UBUNTU),
+]
+allocations = allocate_laptops(people, laptops)
+for person, laptop in allocations.items():
+    print(f"{person.name} gets {laptop.manufacturer} {laptop.model} ({laptop.operating_system.value})")
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