solution

app/main.py

@@ -1,34 +1,96 @@
 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[int, int], end: tuple[int, int]) -> None:
+        self.decks = []
+        for x_coord in range(start[0], end[0] + 1):
+            for y_coord in range(start[1], end[1] + 1):
+                self.decks.append(Deck(x_coord, y_coord))
+        self.alive_decks = len(self.decks)
 
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+    def get_deck(self, row: int, column: int) -> bool:
+        for deck in self.decks:
+            if (row, column) == (deck.row, deck.column):
+                return deck.is_alive
 
-    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 fire(self, row: int, column: int) -> None:
+        for deck in self.decks:
+            if (row, column) == (deck.row, deck.column):
+                deck.is_alive = False
 
 
 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[tuple[tuple[int, int], tuple[int, int]]]) -> None:
+
+        ships = [Ship(ship_coord[0], ship_coord[1]) for ship_coord in ships]
+        self.field = {(deck.row, deck.column): ship
+                      for ship in ships for deck in ship.decks}
+        if not self._validate_field(ships):
+            print("List of ships is wrong!")
+
+    def fire(self, location: tuple[int, int]) -> str:
+        if location in self.field:
+            if self.field[location].get_deck(location[0], location[1]):
+                self.field[location].fire(location[0], location[1])
+                self.field[location].alive_decks -= 1
+            if self.field[location].alive_decks == 0:
+                return "Sunk!"
+            return "Hit!"
+        return "Miss!"
+
+    def print_field(self) -> None:
+        print(end="  ")
+        for column_num in range(10):
+            print(f" {column_num} ", end="")
+        print()
+        for row in range(10):
+            print(row, end=" ")
+            for column in range(10):
+                if (row, column) in self.field:
+                    if self.field[(row, column)].get_deck(row, column):
+                        print(u" \u25A1 ", end="")
+                    else:
+                        print(" x ", end="")
+                else:
+                    print(" . ", end="")
+            print()
+
+    def _validate_field(self, ships: list[Ship]) -> bool:
+        single_deck = 0
+        double_deck = 0
+        three_deck = 0
+        four_deck = 0
+        for ship in ships:
+            if ship.alive_decks == 4:
+                four_deck += 1
+            if ship.alive_decks == 3:
+                three_deck += 1
+            if ship.alive_decks == 2:
+                double_deck += 1
+            if ship.alive_decks == 1:
+                single_deck += 1
+        if (four_deck != 1 or three_deck != 2
+                or double_deck != 3 or single_deck != 4):
+            return False
+        check_pool = []
+        for ship in ships:
+            for deck in ship.decks:
+                if (deck.row, deck.column) in check_pool:
+                    return False
+            for deck in ship.decks:
+                check_pool.extend([(deck.row, deck.column),
+                                  (deck.row, deck.column + 1),
+                                  (deck.row, deck.column - 1),
+                                  (deck.row + 1, deck.column + 1),
+                                  (deck.row + 1, deck.column - 1),
+                                  (deck.row + 1, deck.column),
+                                  (deck.row - 1, deck.column + 1),
+                                  (deck.row - 1, deck.column - 1),
+                                  (deck.row - 1, deck.column)])
+        return True