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<p>Given an <code>m x n</code> matrix <code>board</code> containing <code>'X'</code> and <code>'O'</code>, <em>capture all regions that are 4-directionally surrounded by</em> <code>'X'</code>.</p>
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<p>You are given an <code>m x n</code> matrix <code>board</code> containing <strong>letters</strong> <code>'X'</code> and <code>'O'</code>, <strong>capture regions</strong> that are <strong>surrounded</strong>:</p>
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<p>A region is <strong>captured</strong> by flipping all <code>'O'</code>s into <code>'X'</code>s in that surrounded region.</p>
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<ul>
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<li><strong>Connect</strong>: A cell is connected to adjacent cells horizontally or vertically.</li>
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<li><strong>Region</strong>: To form a region <strong>connect every</strong> <code>'O'</code> cell.</li>
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<li><strong>Surround</strong>: The region is surrounded with <code>'X'</code> cells if you can <strong>connect the region </strong>with <code>'X'</code> cells and none of the region cells are on the edge of the <code>board</code>.</li>
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</ul>
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<p>To capture a <strong>surrounded region</strong>, replace all <code>'O'</code>s with <code>'X'</code>s <strong>in-place</strong> within the original board. You do not need to return anything.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/02/19/xogrid.jpg" style="width: 550px; height: 237px;" />
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<pre>
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<strong>Input:</strong> board = [["X","X","X","X"],["X","O","O","X"],["X","X","O","X"],["X","O","X","X"]]
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<strong>Output:</strong> [["X","X","X","X"],["X","X","X","X"],["X","X","X","X"],["X","O","X","X"]]
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<strong>Explanation:</strong> Notice that an 'O' should not be flipped if:
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- It is on the border, or
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- It is adjacent to an 'O' that should not be flipped.
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The bottom 'O' is on the border, so it is not flipped.
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The other three 'O' form a surrounded region, so they are flipped.
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</pre>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">board = [["X","X","X","X"],["X","O","O","X"],["X","X","O","X"],["X","O","X","X"]]</span></p>
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<p><strong>Output:</strong> <span class="example-io">[["X","X","X","X"],["X","X","X","X"],["X","X","X","X"],["X","O","X","X"]]</span></p>
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<p><strong>Explanation:</strong></p>
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<img alt="" src="https://assets.leetcode.com/uploads/2021/02/19/xogrid.jpg" style="width: 367px; height: 158px;" />
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<p>In the above diagram, the bottom region is not captured because it is on the edge of the board and cannot be surrounded.</p>
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</div>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> board = [["X"]]
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<strong>Output:</strong> [["X"]]
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</pre>
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<div class="example-block">
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<p><strong>Input:</strong> <span class="example-io">board = [["X"]]</span></p>
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<p><strong>Output:</strong> <span class="example-io">[["X"]]</span></p>
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</div>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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