Solution

app/main.py

@@ -1,34 +1,126 @@
+from typing import Any
+
+
 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):
+    def __init__(self,
+                 start: tuple,
+                 end: tuple,
+                 is_drowned: bool = False) -> None:
         # Create decks and save them to a list `self.decks`
-        pass
+        self.is_drowned = is_drowned
+        self.decks = []
+        for row in range(min(start[0], end[0]),
+                         max(start[0], end[0]) + 1):
+            for column in range(min(start[1], end[1]),
+                                max(start[1], end[1]) + 1):
+                self.decks.append(Deck(row, column))
 
-    def get_deck(self, row, column):
+    def get_deck(self, row: int, column: int) -> None | Deck:
         # Find the corresponding deck in the list
-        pass
+        for deck in self.decks:
+            if deck.row == row and deck.column == column:
+                return deck
+        return None
 
-    def fire(self, row, column):
+    def fire(self, row: int, column: int) -> bool:
         # Change the `is_alive` status of the deck
         # And update the `is_drowned` value if it's needed
-        pass
+        for deck in self.decks:
+            if deck.row == row and deck.column == column:
+                deck.is_alive = False
+                break
+
+        self.is_drowned = all(not deck.is_alive for deck in self.decks)
+        return self.is_drowned
+
+    def is_alive(self, row: int, column: int) -> bool:
+        return any(deck.row == row
+                   and deck.column == column
+                   and deck.is_alive for deck in self.decks)
 
 
 class Battleship:
-    def __init__(self, ships):
+    def __init__(self, ships: tuple) -> None:
         # 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
+        self.field = {}
+        self.ships = []
+        self._field(ships)
+        self._validate_field()
+
+    def _field(self, ships: tuple) -> None:
+        for start, end in ships:
+            ship = Ship(start, end)
+            self.ships.append(ship)
+            for deck in ship.decks:
+                self.field[(deck.row, deck.column)] = ship
+
+    def _validate_field(self) -> Any:
+        size_of_ships = [len(ship.decks) for ship in self.ships]
+        if len(self.ships) != 10:
+            raise ValueError("The total number of the ships should be 10!")
+        if size_of_ships.count(1) != 4:
+            raise ValueError("There should be 4 single-deck ships!")
+        if size_of_ships.count(2) != 3:
+            raise ValueError("There should be 3 double-deck ships!")
+        if size_of_ships.count(3) != 2:
+            raise ValueError("There should be 2 three-deck ships!")
+        if size_of_ships.count(4) != 1:
+            raise ValueError("There should be 1 four-deck ships!")
 
-    def fire(self, location: tuple):
+        for ship in self.ships:
+            for deck in ship.decks:
+                neighbors = [
+                    (row, column)
+                    for row in range(max(0, deck.row - 1),
+                                     min(10, deck.row + 2))
+                    for column in range(max(0, deck.column - 1),
+                                        min(10, deck.column + 2))
+                    if (row, column) != (deck.row, deck.column)
+                ]
+                for neighbor in neighbors:
+                    if (neighbor in self.field
+                            and self.field[neighbor] != ship):
+                        raise ValueError("ships shouldn't be"
+                                         " located in the neighboring cells")
+
+    def fire(self, location: tuple) -> str:
         # 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
+        row, column = location
+        if (row, column) not in self.field:
+            return "Miss!"
+
+        ship = self.field[(row, column)]
+        is_drowned = ship.fire(row, column)
+
+        if is_drowned:
+            for deck in ship.decks:
+                self.field[(deck.row, deck.column)] = None
+            return "Sunk!"
+        return "Hit!"
+
+    def print_field(self) -> None:
+        field = [["~"] * 10 for _ in range(10)]
+        for (row, column), ship in self.field.items():
+            if ship:
+                if ship.is_alive(row, column):
+                    field[row][column] = u"\u25A1"
+                else:
+                    field[row][column] = "*"
+            else:
+                field[row][column] = "x"
+
+        for row in field:
+            print(" " + "  ".join(row))