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41 lines
1.7 KiB
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41 lines
1.7 KiB
HTML
<p>You are given a string <code>s</code> consisting of <code>n</code> characters which are either <code>'X'</code> or <code>'O'</code>.</p>
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<p>A <strong>move</strong> is defined as selecting <strong>three</strong> <strong>consecutive characters</strong> of <code>s</code> and converting them to <code>'O'</code>. Note that if a move is applied to the character <code>'O'</code>, it will stay the <strong>same</strong>.</p>
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<p>Return <em>the <strong>minimum</strong> number of moves required so that all the characters of </em><code>s</code><em> are converted to </em><code>'O'</code>.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> s = "XXX"
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<strong>Output:</strong> 1
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<strong>Explanation:</strong> <u>XXX</u> -> OOO
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We select all the 3 characters and convert them in one move.
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</pre>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> s = "XXOX"
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<strong>Output:</strong> 2
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<strong>Explanation:</strong> <u>XXO</u>X -> O<u>OOX</u> -> OOOO
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We select the first 3 characters in the first move, and convert them to <code>'O'</code>.
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Then we select the last 3 characters and convert them so that the final string contains all <code>'O'</code>s.</pre>
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<p><strong>Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> s = "OOOO"
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<strong>Output:</strong> 0
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<strong>Explanation:</strong> There are no <code>'X's</code> in <code>s</code> to convert.
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>3 <= s.length <= 1000</code></li>
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<li><code>s[i]</code> is either <code>'X'</code> or <code>'O'</code>.</li>
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</ul>
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