Class Solution
java.lang.Object
g1901_2000.s1958_check_if_move_is_legal.Solution
1958 - Check if Move is Legal.<p>Medium</p>
<p>You are given a <strong>0-indexed</strong> <code>8 x 8</code> grid <code>board</code>, where <code>board[r][c]</code> represents the cell <code>(r, c)</code> on a game board. On the board, free cells are represented by <code>'.'</code>, white cells are represented by <code>'W'</code>, and black cells are represented by <code>'B'</code>.</p>
<p>Each move in this game consists of choosing a free cell and changing it to the color you are playing as (either white or black). However, a move is only <strong>legal</strong> if, after changing it, the cell becomes the <strong>endpoint of a good line</strong> (horizontal, vertical, or diagonal).</p>
<p>A <strong>good line</strong> is a line of <strong>three or more cells (including the endpoints)</strong> where the endpoints of the line are <strong>one color</strong> , and the remaining cells in the middle are the <strong>opposite color</strong> (no cells in the line are free). You can find examples for good lines in the figure below:</p>
<p><img src="https://assets.leetcode.com/uploads/2021/07/22/goodlines5.png" alt="" /></p>
<p>Given two integers <code>rMove</code> and <code>cMove</code> and a character <code>color</code> representing the color you are playing as (white or black), return <code>true</code> <em>if changing cell</em> <code>(rMove, cMove)</code> <em>to color</em> <code>color</code> <em>is a <strong>legal</strong> move, or</em> <code>false</code> <em>if it is not legal</em>.</p>
<p><strong>Example 1:</strong></p>
<p><img src="https://assets.leetcode.com/uploads/2021/07/10/grid11.png" alt="" /></p>
<p><strong>Input:</strong></p>
<pre><code> board = [ [".",".",".","B",".",".",".","."],
[".",".",".","W",".",".",".","."],
[".",".",".","W",".",".",".","."],
[".",".",".","W",".",".",".","."],
["W","B","B",".","W","W","W","B"],
[".",".",".","B",".",".",".","."],
[".",".",".","B",".",".",".","."],
[".",".",".","W",".",".",".","."]],
rMove = 4, cMove = 3, color = "B"
</code></pre>
<p><strong>Output:</strong> true</p>
<p><strong>Explanation:</strong> ‘.’, ‘W’, and ‘B’ are represented by the colors blue, white, and black respectively, and cell (rMove, cMove) is marked with an ‘X’. The two good lines with the chosen cell as an endpoint are annotated above with the red rectangles.</p>
<p><strong>Example 2:</strong></p>
<p><img src="https://assets.leetcode.com/uploads/2021/07/10/grid2.png" alt="" /></p>
<p><strong>Input:</strong></p>
<pre><code> board = [ [".",".",".",".",".",".",".","."],
[".","B",".",".","W",".",".","."],
[".",".","W",".",".",".",".","."],
[".",".",".","W","B",".",".","."],
[".",".",".",".",".",".",".","."],
[".",".",".",".","B","W",".","."],
[".",".",".",".",".",".","W","."],
[".",".",".",".",".",".",".","B"]],
rMove = 4, cMove = 4, color = "W"
</code></pre>
<p><strong>Output:</strong> false</p>
<p><strong>Explanation:</strong> While there are good lines with the chosen cell as a middle cell, there are no good lines with the chosen cell as an endpoint.</p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>board.length == board[r].length == 8</code></li>
<li><code>0 <= rMove, cMove < 8</code></li>
<li><code>board[rMove][cMove] == '.'</code></li>
<li><code>color</code> is either <code>'B'</code> or <code>'W'</code>.</li>
</ul>
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionbooleancheckMove(char[][] board, int rMove, int cMove, char color)
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Constructor Details
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Solution
public Solution()
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Method Details
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checkMove
public boolean checkMove(char[][] board, int rMove, int cMove, char color)
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