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Given an array of integers <code>nums</code> which is sorted in ascending order, and an integer <code>target</code>, write a function to search <code>target</code> in <code>nums</code>. If <code>target</code> exists, then return its index. Otherwise, return <code>-1</code>.

You must write an algorithm with <code>O(log n)</code> runtime complexity.

&nbsp;
Example 1:

<pre>
Input: nums = [-1,0,3,5,9,12], target = 9
Output: 4
Explanation: 9 exists in nums and its index is 4
</pre>

Example 2:

<pre>
Input: nums = [-1,0,3,5,9,12], target = 2
Output: -1
Explanation: 2 does not exist in nums so return -1
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= nums.length &lt;= 104</code></li>
	<li><code>-104 &lt; nums[i], target &lt; 104</code></li>
	<li>All the integers in <code>nums</code> are unique.</li>
	<li><code>nums</code> is sorted in ascending order.</li>
</ul>

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