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add leetcode problem-cn part2

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<p>给定一个整数数组和一个整数&nbsp;<code>k</code><strong> </strong>请找到该数组中和为&nbsp;<code>k</code><strong>&nbsp;</strong>的连续子数组的个数。</p>
<p>&nbsp;</p>
<p><strong>示例 1 :</strong></p>
<pre>
<strong>输入:</strong>nums = [1,1,1], k = 2
<strong>输出:</strong> 2
<strong>解释:</strong> 此题 [1,1] 与 [1,1] 为两种不同的情况
</pre>
<p><strong>示例 2&nbsp;:</strong></p>
<pre>
<strong>输入:</strong>nums = [1,2,3], k = 3
<strong>输出:</strong> 2
</pre>
<p>&nbsp;</p>
<p><strong>提示:</strong></p>
<ul>
<li><code>1 &lt;= nums.length &lt;= 2 * 10<sup>4</sup></code></li>
<li><code>-1000 &lt;= nums[i] &lt;= 1000</code></li>
<li>
<p><code>-10<sup>7</sup>&nbsp;&lt;= k &lt;= 10<sup>7</sup></code></p>
</li>
</ul>
<p>&nbsp;</p>
<p>注意:本题与主站 560&nbsp;题相同:&nbsp;<a href="https://leetcode-cn.com/problems/subarray-sum-equals-k/">https://leetcode-cn.com/problems/subarray-sum-equals-k/</a></p>