diff --git a/.gitignore b/.gitignore
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+node_modules/
\ No newline at end of file
diff --git a/allocate_laptop.py b/allocate_laptop.py
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+++ b/allocate_laptop.py
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+from dataclasses import dataclass
+from enum import Enum
+from typing import Dict, List
+
+class OperatingSystem(Enum):
+    MACOS = "macOS"
+    ARCH = "Arch Linux"
+    UBUNTU = "Ubuntu"
+
+@dataclass(frozen=True)
+class Person:
+    name: str
+    age: int
+    # Sorted in order of preference, most preferred is first.
+    preferred_operating_system: List[OperatingSystem]
+
+    def __hash__(self):
+        return hash((self.name, self.age, tuple(self.preferred_operating_system)))    
+
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+
+
+def allocate_laptops(people: List[Person], laptops: List[Laptop]) -> Dict[Person, Laptop]: 
+    allocations: Dict[Person, Laptop] = {}
+    available_laptops = laptops.copy()
+    
+    for person in people:
+        # Find laptop that gives this person minimum sadness
+        if available_laptops:
+            best_laptop = min(available_laptops, key=lambda l: calculate_sadness(person, l))
+            allocations[person] = best_laptop
+            available_laptops.remove(best_laptop)  # Laptop now allocated
+        else:
+            # No laptops left, assign None or a “dummy” Laptop with sadness 100
+            allocations[person] = None 
+    
+    return allocations  
+
+
+def calculate_sadness(person: Person, laptop: Laptop) -> int:
+    """Return sadness for a person if given this laptop."""
+    if laptop is None:
+        return 100  # no laptop, maximum sadness
+    try:
+        return person.preferred_operating_system.index(laptop.operating_system)
+    except ValueError:
+        return 100  # OS not in preferences
+        
+    
+# Sample laptops
+laptops = [
+    Laptop(id=1, manufacturer="Dell", model="XPS", screen_size_in_inches=13, operating_system=OperatingSystem.ARCH),
+    Laptop(id=2, manufacturer="Dell", model="XPS", screen_size_in_inches=15, operating_system=OperatingSystem.UBUNTU),
+    Laptop(id=3, manufacturer="Apple", model="MacBook", screen_size_in_inches=13, operating_system=OperatingSystem.MACOS),
+]
+
+# Sample people with preferences
+people = [
+    Person(name="Alice", age=25, preferred_operating_system=[OperatingSystem.UBUNTU, OperatingSystem.MACOS]),
+    Person(name="Bob", age=30, preferred_operating_system=[OperatingSystem.MACOS, OperatingSystem.ARCH]),
+    Person(name="Charlie", age=22, preferred_operating_system=[OperatingSystem.ARCH, OperatingSystem.UBUNTU]),
+    Person(name="Jack", age=18, preferred_operating_system=[OperatingSystem.ARCH, OperatingSystem.UBUNTU]),
+    Person(name="Faith", age=23, preferred_operating_system=[OperatingSystem.ARCH, OperatingSystem.UBUNTU]),
+]
+
+# Allocate laptops
+allocations = allocate_laptops(people, laptops)
+
+# Calculate total sadness
+total_sadness = sum(calculate_sadness(person, laptop) for person, laptop in allocations.items())
+print(f"\nTotal sadness: {total_sadness}")
+
+# Print allocations and sadness
+for person, laptop in allocations.items():
+    if laptop is not None:
+        print(f"{person.name} got {laptop.manufacturer} {laptop.model} ({laptop.operating_system.value}) "
+            f"→ Sadness: {calculate_sadness(person, laptop)}")
+    else:
+        print(f"{person.name} got no laptop → Sadness: 100")
+