Solution

app/main.py

@@ -1,34 +1,62 @@
+from typing import List, Tuple
+
+
 class Deck:
-    def __init__(self, row, column, is_alive=True):
-        pass
+    def __init__(self, row: int, col: int, alive: bool = True) -> None:
+        self.row = row
+        self.col = col
+        self.alive = alive
 
 
 class Ship:
-    def __init__(self, start, end, is_drowned=False):
-        # Create decks and save them to a list `self.decks`
-        pass
-
-    def get_deck(self, row, column):
-        # Find the corresponding deck in the list
-        pass
+    def __init__(self, start: Tuple[int, int], end: Tuple[int, int]) -> None:
+        self.decks = []
+        self.drowned = False
+        row_step = start[0] == end[0]
+        for i in range(start[row_step], end[row_step] + 1):
+            pos = (start[0], i) if row_step else (i, start[1])
+            self.decks.append(Deck(*pos))
 
-    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, col: int) -> str:
+        deck = next(
+            (d for d in self.decks
+             if d.row == row and d.col == col and d.alive),
+            None)
+        if deck:
+            deck.alive = False
+            if all(not d.alive for d in self.decks):
+                self.drowned = True
+                return "Sunk!"
+            return "Hit!"
+        return None
 
 
 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:
+        self.field = {
+            (d.row, d.col): ship
+            for start, end in ships
+            for ship in [Ship(start, end)]
+            for d in ship.decks
+        }
+
+    def fire(self, loc: Tuple[int, int]) -> str:
+        ship = self.field.get(loc)
+        return ship.fire(*loc) if ship else "Miss!"
+
+    def print_field(self) -> None:
+        for row in range(10):
+            line = "".join(self.cell_symbol(row, col) for col in range(10))
+            print(line)
+
+    def cell_symbol(self, row: int, col: int) -> str:
+        if (row, col) in self.field:
+            ship = self.field[(row, col)]
+            if ship.decks[0].alive:
+                return "□ "
+            elif ship.drowned:
+                return "x "
+            return "* "
+        return "~ "