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<p>在一个 8 x 8 的棋盘上，有一个白色的车（<code>Rook</code>），用字符 <code>'R'</code> 表示。棋盘上还可能存在空方块，白色的象（<code>Bishop</code>）以及黑色的卒（<code>pawn</code>），分别用字符 <code>'.'</code>，<code>'B'</code> 和 <code>'p'</code> 表示。不难看出，大写字符表示的是白棋，小写字符表示的是黑棋。</p>
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<p>给定一个 <code>8 x 8</code> 的棋盘，<strong>只有一个</strong> 白色的车，用字符 <code>'R'</code> 表示。棋盘上还可能存在白色的象 <code>'B'</code> 以及黑色的卒 <code>'p'</code>。空方块用字符 <code>'.'</code> 表示。</p>
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<p>车按国际象棋中的规则移动。东，西，南，北四个基本方向任选其一，然后一直向选定的方向移动，直到满足下列四个条件之一：</p>
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<p>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 <strong>吃掉</strong> 棋子。</p>
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<ul>
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<li>棋手选择主动停下来。</li>
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<li>棋子因到达棋盘的边缘而停下。</li>
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<li>棋子移动到某一方格来捕获位于该方格上敌方（黑色）的卒，停在该方格内。</li>
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<li>车不能进入/越过已经放有其他友方棋子（白色的象）的方格，停在友方棋子前。</li>
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</ul>
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<p>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。</p>
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<p>你现在可以控制车移动一次，请你统计有多少敌方的卒处于你的捕获范围内（即，可以被一步捕获的棋子数）。</p>
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<p>返回白车 <strong>攻击</strong> 范围内 <strong>兵的数量</strong>。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<p><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/02/23/1253_example_1_improved.PNG" style="height: 305px; width: 300px;"></p>
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<p><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/02/23/1253_example_1_improved.PNG" style="height: 305px; width: 300px;" /></p>
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<pre><strong>输入：</strong>[[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".","R",".",".",".","p"],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."]]
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<pre>
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<strong>输入：</strong>[[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".","R",".",".",".","p"],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."]]
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<strong>输出：</strong>3
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<strong>解释：
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</strong>在本例中，车能够捕获所有的卒。
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</strong>在本例中，车能够吃掉所有的卒。
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</pre>
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<p><strong>示例 2：</strong></p>
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<p><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/02/23/1253_example_2_improved.PNG" style="height: 306px; width: 300px;"></p>
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<p><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/02/23/1253_example_2_improved.PNG" style="height: 306px; width: 300px;" /></p>
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<pre><strong>输入：</strong>[[".",".",".",".",".",".",".","."],[".","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",".","."],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."]]
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<pre>
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<strong>输入：</strong>[[".",".",".",".",".",".",".","."],[".","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",".","."],[".",".",".",".",".",".",".","."],[".",".",".",".",".",".",".","."]]
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<strong>输出：</strong>0
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<strong>解释：
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</strong>象阻止了车捕获任何卒。
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</strong>象阻止了车吃掉任何卒。
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</pre>
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<p><strong>示例 3：</strong></p>
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<p><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/02/23/1253_example_3_improved.PNG" style="height: 305px; width: 300px;"></p>
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<p><img alt="" src="https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2019/02/23/1253_example_3_improved.PNG" style="height: 305px; width: 300px;" /></p>
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<pre><strong>输入：</strong>[[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".","p",".",".",".","."],["p","p",".","R",".","p","B","."],[".",".",".",".",".",".",".","."],[".",".",".","B",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".",".",".",".",".","."]]
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<pre>
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<strong>输入：</strong>[[".",".",".",".",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".","p",".",".",".","."],["p","p",".","R",".","p","B","."],[".",".",".",".",".",".",".","."],[".",".",".","B",".",".",".","."],[".",".",".","p",".",".",".","."],[".",".",".",".",".",".",".","."]]
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<strong>输出：</strong>3
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<strong>解释： </strong>
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车可以捕获位置 b5，d6 和 f5 的卒。
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车可以吃掉位置 b5，d6 和 f5 的卒。
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</pre>
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<p> </p>
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@@ -48,7 +46,8 @@
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<p><strong>提示：</strong></p>
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<ol>
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<li><code>board.length == board[i].length == 8</code></li>
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<li><code>board[i][j]</code> 可以是 <code>'R'</code>，<code>'.'</code>，<code>'B'</code> 或 <code>'p'</code></li>
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<li>只有一个格子上存在 <code>board[i][j] == 'R'</code></li>
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<li><code>board.length == 8</code></li>
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<li><code>board[i].length == 8</code></li>
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<li><code>board[i][j]</code> 可以是 <code>'R'</code>，<code>'.'</code>，<code>'B'</code> 或 <code>'p'</code></li>
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<li>只有一个格子上存在 <code>board[i][j] == 'R'</code></li>
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</ol>
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