two-sum

Algorithms

Two Sum

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twoSum

Given an array of integers <code>nums</code>&nbsp;and an integer <code>target</code>, return indices of the two numbers such that they add up to <code>target</code>.

You may assume that each input would have exactly one solution, and you may not use the same element twice.

You can return the answer in any order.

&nbsp;
Example 1:

<pre>
Input: nums = [2,7,11,15], target = 9
Output: [0,1]
Explanation: Because nums[0] + nums[1] == 9, we return [0, 1].
</pre>

Example 2:

<pre>
Input: nums = [3,2,4], target = 6
Output: [1,2]
</pre>

Example 3:

<pre>
Input: nums = [3,3], target = 6
Output: [0,1]
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>2 &lt;= nums.length &lt;= 104</code></li>
	<li><code>-109 &lt;= nums[i] &lt;= 109</code></li>
	<li><code>-109 &lt;= target &lt;= 109</code></li>
	<li>Only one valid answer exists.</li>
</ul>

&nbsp;
Follow-up:&nbsp;Can you come up with an algorithm that is less than <code>O(n2)</code>&nbsp;time complexity?

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