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30 lines
1.5 KiB
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30 lines
1.5 KiB
HTML
<p>Given a string <code>s</code> containing only three types of characters: <code>'('</code>, <code>')'</code> and <code>'*'</code>, return <code>true</code> <em>if</em> <code>s</code> <em>is <strong>valid</strong></em>.</p>
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<p>The following rules define a <strong>valid</strong> string:</p>
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<ul>
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<li>Any left parenthesis <code>'('</code> must have a corresponding right parenthesis <code>')'</code>.</li>
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<li>Any right parenthesis <code>')'</code> must have a corresponding left parenthesis <code>'('</code>.</li>
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<li>Left parenthesis <code>'('</code> must go before the corresponding right parenthesis <code>')'</code>.</li>
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<li><code>'*'</code> could be treated as a single right parenthesis <code>')'</code> or a single left parenthesis <code>'('</code> or an empty string <code>""</code>.</li>
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</ul>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre><strong>Input:</strong> s = "()"
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<strong>Output:</strong> true
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</pre><p><strong class="example">Example 2:</strong></p>
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<pre><strong>Input:</strong> s = "(*)"
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<strong>Output:</strong> true
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</pre><p><strong class="example">Example 3:</strong></p>
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<pre><strong>Input:</strong> s = "(*))"
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<strong>Output:</strong> true
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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>1 <= s.length <= 100</code></li>
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<li><code>s[i]</code> is <code>'('</code>, <code>')'</code> or <code>'*'</code>.</li>
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</ul>
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