Create README - LeetHub

hajin-kim · hajin-kim · commit dc5301a6b828 · 2025-05-11T11:03:02.000+09:00
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+<h2><a href="https://leetcode.com/problems/4sum/">18. 4Sum</a></h2><h3>Medium</h3><hr><p>Given an array <code>nums</code> of <code>n</code> integers, return <em>an array of all the <strong>unique</strong> quadruplets</em> <code>[nums[a], nums[b], nums[c], nums[d]]</code> such that:</p>
+
+<ul>
+	<li><code>0 &lt;= a, b, c, d&nbsp;&lt; n</code></li>
+	<li><code>a</code>, <code>b</code>, <code>c</code>, and <code>d</code> are <strong>distinct</strong>.</li>
+	<li><code>nums[a] + nums[b] + nums[c] + nums[d] == target</code></li>
+</ul>
+
+<p>You may return the answer in <strong>any order</strong>.</p>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [1,0,-1,0,-2,2], target = 0
+<strong>Output:</strong> [[-2,-1,1,2],[-2,0,0,2],[-1,0,0,1]]
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [2,2,2,2,2], target = 8
+<strong>Output:</strong> [[2,2,2,2]]
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums.length &lt;= 200</code></li>
+	<li><code>-10<sup>9</sup> &lt;= nums[i] &lt;= 10<sup>9</sup></code></li>
+	<li><code>-10<sup>9</sup> &lt;= target &lt;= 10<sup>9</sup></code></li>
+</ul>

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 +<h2><a href="https://leetcode.com/problems/4sum/">18. 4Suma>h2><h3>Mediumh3><hr><p>Given an array <code>numscode> of <code>ncode> integers, return <em>an array of all the <strong>uniquestrong> quadrupletsem> <code>[nums[a], nums[b], nums[c], nums[d]]code> such that:p>
++
 +<ul>
 +	0 <= a, b, c, d < n
 +	a, b, c, and d are distinct.
 +	nums[a] + nums[b] + nums[c] + nums[d] == target
 +ul>
++
 +<p>You may return the answer in <strong>any orderstrong>.p>
++
 +<p>&nbsp;p>
 +<p><strong class="example">Example 1:strong>p>
++
 +<pre>
 +<strong>Input:strong> nums = [1,0,-1,0,-2,2], target = 0
 +<strong>Output:strong> [[-2,-1,1,2],[-2,0,0,2],[-1,0,0,1]]
 +pre>
++
 +<p><strong class="example">Example 2:strong>p>
++
 +<pre>
 +<strong>Input:strong> nums = [2,2,2,2,2], target = 8
 +<strong>Output:strong> [[2,2,2,2]]
 +pre>
++
 +<p>&nbsp;p>
 +<p><strong>Constraints:strong>p>
++
 +<ul>
 +	1 <= nums.length <= 200
 +	-10⁹ <= nums[i] <= 10⁹
 +	-10⁹ <= target <= 10⁹
 +ul>