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<!DOCTYPE html>
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<title>leetcode:Integer to Roman | 李祖彬的博客</title>
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<meta name="description" content="
题目
Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.
I 1
V 5
X 10
L 50
C 100
D 500
M 1000
代码
class Solution
{
/**
* @...">
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<a href="/leetcode-Integer-to-Roman.html" class="article-date">
<time class="dt-published" datetime="2021-11-25T09:34:59.000Z" itemprop="datePublished">2021-11-25</time>
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leetcode:Integer to Roman
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<div class="e-content article-entry" itemprop="articleBody">
<ul>
<li>题目</li>
</ul>
<p>Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.</p>
<pre class="line-numbers language-none"><code class="language-none">I 1
V 5
X 10
L 50
C 100
D 500
M 1000</code></pre>
<ul>
<li>代码</li>
</ul>
<pre class="line-numbers language-none"><code class="language-none">class Solution
{
/**
* @param Integer $num
* @return String
*/
public function intToRoman($num)
{
$roman = '';
$nine = ['', 'CM', 'XC', 'IX'];
$four = ['', 'CD', 'XL', 'IV'];
$greate = ['', 'D', 'L', 'V'];
$less = ['M', 'C', 'X', 'I'];
$steps = [1000, 100, 10, 1];
$i = 0;
while ($i < 4) {
$x = intval($num / $steps[$i]);
if ($x < 1) {
$i++;
continue;
}
$num = $num % $steps[$i];
$times = $x % 5;
if ($times === 4) {
if ($x > 5) {
$roman .= $nine[$i];
$i++;
continue;
}
$roman .= $four[$i];
$i++;
continue;
}
if ($x >= 5) {
$roman .= $greate[$i] . str_repeat($less[$i], $times);
$i++;
continue;
}
$roman .= str_repeat($less[$i], $times);
$i++;
}
return $roman;
}
}</code></pre>
<ul>
<li>结果</li>
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<blockquote>
<p>Accepted<br>3999/3999 cases passed (20 ms)<br>Your runtime beats 70.13 % of php submissions<br>Your memory usage beats 94.81 % of php submissions (15.4 MB)</p>
</blockquote>
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