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<!DOCTYPE html>
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<title>leetcode: Longest Palindromic Substring | 李祖彬的博客</title>
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问题
Given a string s, return the longest palindromic substring in s.
代码
class Solution {
/**
* @param String $s
* @return String
*/
function longestPalin...">
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<a href="/leetcode-Longest-Palindromic-Substring.html" class="article-date">
<time class="dt-published" datetime="2021-11-03T01:56:46.000Z" itemprop="datePublished">2021-11-03</time>
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leetcode: Longest Palindromic Substring
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<div class="e-content article-entry" itemprop="articleBody">
<ul>
<li>问题</li>
</ul>
<blockquote>
<p>Given a string s, return the longest palindromic substring in s.</p>
</blockquote>
<ul>
<li>代码</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">class Solution {
/**
* @param String $s
* @return String
*/
function longestPalindrome($s) {
$len = strlen($s);
if ($len === 1) {
return $s;
}
if ($len === 2) {
if ($s[0] === $s[1]) {
return $s;
}
return $s[0];
}
$palindromic = $s[0];
$max = 1;
for($i = 0; $i < $len; $i++) {
if (strlen(substr($s, $i)) < $max) {
break;
}
for($j = $len - $i - 1; $j >= 0; $j--) {
if ($j + 1 < $max) {
break;
}
$str = substr($s, $i, $j + 1);
$sub = strrev($str);
if ($sub === $str) {
if($max < strlen($sub)) {
$palindromic = $sub;
$max = strlen($sub);
}
break;
}
}
}
return $palindromic;
}
}</code></pre>
<ul>
<li>结果</li>
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<blockquote>
<p>11510/11510 cases passed (90 ms)<br>Your runtime beats 9.13 % of php submissions<br>Your memory usage beats 99.87 % of php submissions (15.1 MB)</p>
</blockquote>
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