Move validation in LLD - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a move is within the board boundaries.

LLD

def is_valid_move(x, y, board_size):
    return 0 <= x [1] board_size and 0 <= y < board_size

Drag options to blanks, or click blank then click option'

A<=

B>

C<

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using >= instead of < causes out-of-bound errors.

Using > excludes valid positions at zero.

The move coordinates must be less than the board size to be valid.

2fill in blank

medium

Complete the code to check if the target cell is empty before moving.

LLD

def can_move(board, x, y):
    return board[x][y] == [1]

Drag options to blanks, or click blank then click option'

ANone

B0

C1

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 or 1 may confuse empty and occupied cells.

Using True is incorrect because it's a boolean, not a cell state.

Empty cells are represented by None to indicate no piece is present.

3fill in blank

hard

Fix the error in the move validation to ensure the piece belongs to the current player.

LLD

def is_player_piece(board, x, y, player):
    return board[x][y] == [1]

Drag options to blanks, or click blank then click option'

Aplayer

Bopponent

CTrue

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Checking against opponent or None causes invalid moves.

Using True is not meaningful for piece ownership.

The piece at the position must match the current player's identifier.

4fill in blank

hard

Fill both blanks to validate a move that is inside the board and the target cell is empty.

LLD

def validate_move(board, x, y, board_size):
    return (0 <= x [1] board_size and 0 <= y [2] board_size and board[x][y] is None)

Drag options to blanks, or click blank then click option'

A<

B>

C<=

D>=

Attempts:

3 left

💡 Hint

Common Mistakes

Using >= causes out-of-bound errors.

Mixing operators leads to incorrect validation.

Both x and y must be less than board_size to be valid positions.

5fill in blank

hard

Fill all three blanks to check if a move is valid: inside board, target empty, and piece belongs to player.

LLD

def full_move_validation(board, x, y, board_size, player):
    return (0 <= x [1] board_size and 0 <= y [2] board_size and board[x][y] is [3] and board[x][y] == player)

Drag options to blanks, or click blank then click option'

A<

B>

CNone

DTrue

Attempts:

3 left

💡 Hint

Common Mistakes

Using > instead of < for boundaries.

Checking cell is True instead of None.

Not verifying piece ownership.

The move must be inside the board (x and y less than board_size), the target cell empty (None), and the piece must belong to the player.