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<!DOCTYPE html>
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<meta charset="utf-8">
<title>leetcode:Valid Parentheses | 李祖彬的博客</title>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta name="description" content="
问题
Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid.
An input string is valid if:
Open brackets must be closed by the same...">
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<a href="/leetcode-Valid-Parentheses.html" class="article-date">
<time class="dt-published" datetime="2022-04-11T13:34:38.000Z" itemprop="datePublished">2022-04-11</time>
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leetcode:Valid Parentheses
</h1>
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<div class="e-content article-entry" itemprop="articleBody">
<ul>
<li>问题</li>
</ul>
<blockquote>
<p>Given a string s containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input string is valid.</p>
<p>An input string is valid if:</p>
<ol>
<li>Open brackets must be closed by the same type of brackets.</li>
<li>Open brackets must be closed in the correct order.</li>
</ol>
</blockquote>
<ul>
<li>解决</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">class Solution {
/**
* @param String $s
* @return Boolean
*/
function isValid($s) {
if(strlen($s) % 2) {
return false;
}
while(true){
$c = $s[0];
$s = substr($s, 1);
$i = $this->match($c, $s);
if($i === false){
return false;
}
$s = substr($s, 0, $i) . substr($s, $i + 1);
if(empty($s)){
break;
}
}
return true;
}
function match($c, $s)
{
$map = [
'(' => ')',
'{' => '}',
'[' => ']'
];
if($s[0] === $map[$c]) {
return 0;
}
$offset = 0;
for($i = 0, $len = strlen($s); $i < $len; $i++) {
if(in_array($s[$i], ['(', '{', '['], true)) {
$offset += 2;
}
if($s[$i] === $map[$c] && $offset === $i) {
return $offset;
}
}
return false;
}
}</code></pre>
<p>主要找到对应位置,然后比较对应位置是否正确并不断将正确的从字符串中移除.运行效率很低,500ms~900ms之间.<br>看社区排名前面的解决方法(python,java,c++)都是通过栈来解决–先进后出.修改如下:</p>
<span id="more"></span>
<pre class="line-numbers language-none"><code class="language-none">class Solution {
/**
* @param String $s
* @return Boolean
*/
function isValid($s)
{
$stack = [];
$map = ['(' => ')', '{' => '}', '[' => ']'];
for($i = 0, $len = strlen($s); $i < $len; $i++) {
if(isset($map[$s[$i]])) {
$stack[] = $map[$s[$i]];
continue;
}
if(in_array($s[$i], $map, true)) {
if($stack === []) {
return false;
}
$last = array_pop($stack);
if($s[$i] !== $last) {
return false;
}
}
}
return $stack === [];
}
}</code></pre>
<p>运行时间最快只需8ms以内.</p>
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