diff --git a/implement-laptop-allocation/README.md b/implement-laptop-allocation/README.md
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+In the prep, there was an exercise around finding possible laptops for a group of people.
+
+Your exercise is to extend this to actually allocate laptops to the people.
+
+Given these class definitions:
+
+from dataclasses import dataclass
+from enum import Enum
+from typing import 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]
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+Write a function with this signature:
+
+def allocate_laptops(people: List[Person], laptops: List[Laptop]) -> Dict[Person, Laptop]:
+Every person should be allocated exactly one laptop.
+
+If we define "sadness" as the number of places down in someone's ranking the operating system the ended up with (i.e. if your preferences were [UBUNTU, ARCH, MACOS] and you were allocated a MACOS machine your sadness would be 2), we want to minimise the total sadness of all people. If we allocate someone a laptop with an operating system not in their preferred list, treat them as having a sadness of 100.
+
+Maximum time in hours
+3
+
+How to submit
+Submit a PR to this repo containing your function (and any supporting code).
diff --git a/implement-laptop-allocation/main.py b/implement-laptop-allocation/main.py
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+from dataclasses import dataclass
+from enum import Enum
+from typing import List, Dict
+
+from scipy.optimize import linear_sum_assignment 
+
+
+
+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_systems: List[OperatingSystem]
+
+
+@dataclass(frozen=True)
+class Laptop:
+    id: int
+    manufacturer: str
+    model: str
+    screen_size_in_inches: float
+    operating_system: OperatingSystem
+
+
+def sadness(person: Person, laptop: Laptop) ->int:
+        if laptop.operating_system in person.preferred_operating_systems:
+             return person.preferred_operating_systems.index(laptop.operating_system)
+        return 100
+
+
+def allocate_laptops(people: List[Person], laptops: List[Laptop]) -> Dict[Person, Laptop]:
+     
+     if len(people) != len(laptops):
+          raise ValueError("Number of individuals and laptops must be equal")
+     
+     cost_matrix = [
+          [sadness(person, laptop) for laptop in laptops]
+          for person in people
+     ]
+
+     person_indices, laptop_indices = linear_sum_assignment(cost_matrix)
+
+     return {people[p_idx]: laptops[l_idx]
+             for p_idx, l_idx in zip(person_indices, laptop_indices)
+             
+             }
+
+
+
+
+
+if __name__ == "__main__":
+    people = [
+        Person(
+            name="Alice",
+            age=30,
+            preferred_operating_systems=[
+                OperatingSystem.MACOS,
+                OperatingSystem.UBUNTU,
+            ],
+        ),
+        Person(
+            name="Bob",
+            age=25,
+            preferred_operating_systems=[
+                OperatingSystem.UBUNTU,
+                OperatingSystem.MACOS,
+            ],
+        ),
+        Person(
+            name="Carol",
+            age=28,
+            preferred_operating_systems=[
+                OperatingSystem.ARCH,
+                OperatingSystem.MACOS,
+            ],
+        ),
+    ]
+
+    laptops = [
+        Laptop(
+            id=1,
+            manufacturer="Apple",
+            model="MacBook Air",
+            screen_size_in_inches=13.3,
+            operating_system=OperatingSystem.MACOS,
+        ),
+        Laptop(
+            id=2,
+            manufacturer="Dell",
+            model="XPS",
+            screen_size_in_inches=13.0,
+            operating_system=OperatingSystem.UBUNTU,
+        ),
+        Laptop(
+            id=3,
+            manufacturer="Lenovo",
+            model="ThinkPad",
+            screen_size_in_inches=14.0,
+            operating_system=OperatingSystem.ARCH,
+        ),
+    ]
+
+    allocation = allocate_laptops(people, laptops)
+
+    for person, laptop in allocation.items():
+        print(f"{person.name} → {laptop.model} ({laptop.operating_system.value})")