{ "data": { "question": { "questionId": "1041", "questionFrontendId": "999", "categoryTitle": "Algorithms", "boundTopicId": 3046, "title": "Available Captures for Rook", "titleSlug": "available-captures-for-rook", "content": "
You are given an 8 x 8
matrix representing a chessboard. There is exactly one white rook represented by 'R'
, some number of white bishops 'B'
, and some number of black pawns 'p'
. Empty squares are represented by '.'
.
A rook can move any number of squares horizontally or vertically (up, down, left, right) until it reaches another piece or the edge of the board. A rook is attacking a pawn if it can move to the pawn's square in one move.
\n\nNote: A rook cannot move through other pieces, such as bishops or pawns. This means a rook cannot attack a pawn if there is another piece blocking the path.
\n\nReturn the number of pawns the white rook is attacking.
\n\n\n
Example 1:
\nInput: board = [[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".","R",".",".",".","p"],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."]]
\n\nOutput: 3
\n\nExplanation:
\n\nIn this example, the rook is attacking all the pawns.
\nExample 2:
\nInput: board = [[".",".",".",".",".",".","."],[".","p","p","p","p","p",".","."],[".","p","p","B","p","p",".","."],[".","p","B","R","B","p",".","."],[".","p","p","B","p","p",".","."],[".","p","p","p","p","p",".","."],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."]]
\n\nOutput: 0
\n\nExplanation:
\n\nThe bishops are blocking the rook from attacking any of the pawns.
\nExample 3:
\nInput: board = [[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".","p",".",".",".","."],["p","p",".","R",".","p","B","."],[".",".",".",".",".",".",".","."],[".",".",".","B",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".",".",".",".",".","."]]
\n\nOutput: 3
\n\nExplanation:
\n\nThe rook is attacking the pawns at positions b5, d6, and f5.
\n\n
Constraints:
\n\nboard.length == 8
board[i].length == 8
board[i][j]
is either 'R'
, '.'
, 'B'
, or 'p'
board[i][j] == 'R'
给定一个 8 x 8
的棋盘,只有一个 白色的车,用字符 'R'
表示。棋盘上还可能存在白色的象 'B'
以及黑色的卒 'p'
。空方块用字符 '.'
表示。
车可以按水平或竖直方向(上,下,左,右)移动任意个方格直到它遇到另一个棋子或棋盘的边界。如果它能够在一次移动中移动到棋子的方格,则能够 吃掉 棋子。
\n\n注意:车不能穿过其它棋子,比如象和卒。这意味着如果有其它棋子挡住了路径,车就不能够吃掉棋子。
\n\n返回白车 攻击 范围内 兵的数量。
\n\n\n\n
示例 1:
\n\n\n输入:[[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\"p\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\"R\",\".\",\".\",\".\",\"p\"],[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\"p\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"]]\n输出:3\n解释:\n在本例中,车能够吃掉所有的卒。\n\n\n
示例 2:
\n\n\n输入:[[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"],[\".\",\"p\",\"p\",\"p\",\"p\",\"p\",\".\",\".\"],[\".\",\"p\",\"p\",\"B\",\"p\",\"p\",\".\",\".\"],[\".\",\"p\",\"B\",\"R\",\"B\",\"p\",\".\",\".\"],[\".\",\"p\",\"p\",\"B\",\"p\",\"p\",\".\",\".\"],[\".\",\"p\",\"p\",\"p\",\"p\",\"p\",\".\",\".\"],[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"]]\n输出:0\n解释:\n象阻止了车吃掉任何卒。\n\n\n
示例 3:
\n\n\n输入:[[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\"p\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\"p\",\".\",\".\",\".\",\".\"],[\"p\",\"p\",\".\",\"R\",\".\",\"p\",\"B\",\".\"],[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\"B\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\"p\",\".\",\".\",\".\",\".\"],[\".\",\".\",\".\",\".\",\".\",\".\",\".\",\".\"]]\n输出:3\n解释: \n车可以吃掉位置 b5,d6 和 f5 的卒。\n\n\n
\n\n
提示:
\n\nboard.length == 8
board[i].length == 8
board[i][j]
可以是 'R'
,'.'
,'B'
或 'p'
board[i][j] == 'R'
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