国外版

算法题（国外版）/valid-triangle-number.html

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+<p>Given an integer array <code>nums</code>, return <em>the number of triplets chosen from the array that can make triangles if we take them as side lengths of a triangle</em>.</p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [2,2,3,4]
+<strong>Output:</strong> 3
+<strong>Explanation:</strong> Valid combinations are: 
+2,3,4 (using the first 2)
+2,3,4 (using the second 2)
+2,2,3
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [4,2,3,4]
+<strong>Output:</strong> 4
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>1 &lt;= nums.length &lt;= 1000</code></li>
+	<li><code>0 &lt;= nums[i] &lt;= 1000</code></li>
+</ul>