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add leetcode problem-cn part3

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2022-03-27 20:46:41 +08:00
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算法题（国内版）/problem (Chinese)/有效三角形的个数 [valid-triangle-number].html Normal file
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<p>给定一个包含非负整数的数组&nbsp;<code>nums</code> ，返回其中可以组成三角形三条边的三元组个数。</p>
<p>&nbsp;</p>
<p><strong>示例 1:</strong></p>
<pre>
<strong>输入:</strong> nums = [2,2,3,4]
<strong>输出:</strong> 3
<strong>解释:</strong>有效的组合是:
2,3,4 (使用第一个 2)
2,3,4 (使用第二个 2)
2,2,3
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入:</strong> nums = [4,2,3,4]
<strong>输出:</strong> 4</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= nums.length &lt;= 1000</code></li>
<li><code>0 &lt;= nums[i] &lt;= 1000</code></li>
</ul>