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<!DOCTYPE html>
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<title>leetcode:Longest Common Prefix | 李祖彬的博客</title>
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问题
Write a function to find the longest common prefix string amongst an array of strings.
If there is no common prefix, return an empty string “”.
代码
class Solution
{
/**
* ...">
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<time class="dt-published" datetime="2021-11-26T09:45:15.000Z" itemprop="datePublished">2021-11-26</time>
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leetcode:Longest Common Prefix
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<div class="e-content article-entry" itemprop="articleBody">
<ul>
<li>问题</li>
</ul>
<p>Write a function to find the longest common prefix string amongst an array of strings.</p>
<p>If there is no common prefix, return an empty string “”.</p>
<ul>
<li>代码</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">class Solution
{
/**
* @param String[] $strs
* @return String
*/
public function longestCommonPrefix($strs)
{
$prefix = '';
$min = min(array_map('strlen', $strs));
if (!$min) {
return $prefix;
}
for ($i = 0; $i < $min; $i++) {
$alpha = $strs[0][$i];
for ($j = 1, $b = count($strs); $j < $b; $j++) {
if ($strs[$j][$i] !== $alpha) {
return $prefix;
}
}
$prefix .= $alpha;
}
return $prefix;
}
}</code></pre>
<ul>
<li>结果</li>
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<blockquote>
<p>123/123 cases passed (5 ms)<br>Your runtime beats 85.19 % of php submissions<br>Your memory usage beats 60.49 % of php submissions (15.7 MB)</p>
</blockquote>
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