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: int,
+            end: int,
+            is_drowned: bool = False
+    ) -> None:
+        self.decks = [Deck(row, col)
+                      for row, col in self.get_coordinates(start, end)]
+        self.is_drowned = is_drowned
 
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+    @staticmethod
+    def get_coordinates(start: tuple, end: tuple) -> list[tuple]:
+        return [(start[0] + i, start[1] + j)
+                for i in range(end[0] - start[0] + 1)
+                for j in range(end[1] - start[1] + 1)]
 
-    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:
+        return next((deck for deck in self.decks if deck.row
+                     == row and deck.column == column), None)
+
+    def fire(self, row: int, column: int) -> None:
+        deck = self.get_deck(row, column)
+        if deck:
+            deck.is_alive = False
+            if all(not deck_.is_alive for deck_ in self.decks):
+                self.is_drowned = True
 
 
 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.field = {(deck.row, deck.column): ship
+                      for ship_start, ship_end in ships
+                      for ship in [Ship(ship_start, ship_end)]
+                      for deck in ship.decks}
+
+    def fire(self, location: tuple) -> str:
+        if location not in self.field:
+            return "Miss!"
+
+        ship = self.field[location]
+        deck = ship.get_deck(*location)
+
+        if deck.is_alive:
+            ship.fire(location[0], location[1])
+            if ship.is_drowned:
+                return "Sunk!"
+            return "Hit!"
+        return "Miss!"
+
+    def print_field(self) -> None:
+        for row in range(10):
+            for col in range(10):
+                location = (row, col)
+                if location in self.field:
+                    ship = self.field[location]
+                    deck = ship.get_deck(row, col)
+                    if deck.is_alive:
+                        print(u"\u25A1", end=" ")
+                    elif ship.is_drowned:
+                        print("x", end=" ")
+                    else:
+                        print("*", end=" ")
+                else:
+                    print("~", end=" ")
+            print()