Solution

app/main.py

@@ -1,34 +1,78 @@
 class Deck:
-    def __init__(self, row, column, is_alive=True):
-        pass
+    def __init__(
+            self,
+            row: int,
+            column: int,
+            is_alive: bool = True
+    ) -> None:
+        self.row = row
+        self.column = column
+        self.is_alive = is_alive
 
 
 class Ship:
-    def __init__(self, start, end, is_drowned=False):
-        # Create decks and save them to a list `self.decks`
-        pass
+    def __init__(
+            self,
+            start: tuple,
+            end: tuple,
+            is_drowned: bool = False
+    ) -> None:
+        self.decks = []
+        self.is_drowned = is_drowned
 
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+        if start[0] == end[0]:
+            for col in range(start[1], end[1] + 1):
+                self.decks.append(Deck(start[0], col))
+        elif start[1] == end[1]:
+            for row in range(start[0], end[0] + 1):
+                self.decks.append(Deck(row, start[1]))
+        else:
+            raise ValueError("Ships must be either horizontal or vertical")
 
-    def fire(self, row, column):
-        # Change the `is_alive` status of the deck
-        # And update the `is_drowned` value if it's needed
-        pass
+    def get_deck(self, row: int, column: int) -> Deck | None:
+        for deck in self.decks:
+            if deck.row == row and deck.column == column:
+                return deck
+        return None
+
+    def fire(self, row: int, column: int) -> bool:
+        deck = self.get_deck(row, column)
+        if deck:
+            deck.is_alive = False
+            return True
+        return False
+
+    def is_sunk(self) -> bool:
+        return all(not deck.is_alive for deck in self.decks)
 
 
 class Battleship:
-    def __init__(self, ships):
-        # Create a dict `self.field`.
-        # Its keys are tuples - the coordinates of the non-empty cells,
-        # A value for each cell is a reference to the ship
-        # which is located in it
-        pass
-
-    def fire(self, location: tuple):
-        # This function should check whether the location
-        # is a key in the `self.field`
-        # If it is, then it should check if this cell is the last alive
-        # in the ship or not.
-        pass
+    def __init__(self, ships: list) -> None:
+        self.ships = [Ship(start, end) for start, end in ships]
+        self.field = {}
+        for ship in self.ships:
+            for deck in ship.decks:
+                self.field[(deck.row, deck.column)] = ship
+
+    def fire(self, location: tuple) -> str:
+        if location in self.field:
+            ship = self.field[location]
+            if ship.fire(location[0], location[1]):
+                if not ship.is_sunk():
+                    return "Hit!"
+                ship.is_drowned = True
+                return "Sunk!"
+        return "Miss!"
+
+    def print_field(self) -> None:
+        field_size = 10
+        field = [["~" for _ in range(field_size)] for _ in range(field_size)]
+
+        for (row, column), ship in self.field.items():
+            if ship.get_deck(row, column).is_alive:
+                field[row][column] = "□"
+            else:
+                field[row][column] = "x"
+
+        for row in field:
+            print("\t".join(row))