2025-08-01 17:49:53 +0000 UTC

class Solution:
    def numRookCaptures(self, board: List[List[str]]) -> int:
        bishop_row, bishop_col = -1, -1
        length = len(board)
        delta = (
            (0, 1), (0, -1), (1, 0), (-1, 0)            
        )
        for row in range(length):
            for col in range(length):
                if board[row][col] == "R":
                    bishop_row, bishop_col = row, col
                    break
            if bishop_row != -1:
                break
        count = 0
        for delta_row, delta_col in delta:
            row, col = bishop_row, bishop_col
            while 0 <= row < length and 0 <= col < length:
                char = board[row][col]
                if char == "p":
                    count += 1
                    break
                elif char == "B":
                    break
                row, col = row + delta_row, col + delta_col
        return count