two-sum-ii-input-array-is-sorted

Two Sum II - Input Array Is Sorted

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twoSum

Given a 1-indexed array of integers <code>numbers</code> that is already sorted in non-decreasing order, find two numbers such that they add up to a specific <code>target</code> number. Let these two numbers be <code>numbers[index1]</code> and <code>numbers[index2]</code> where <code>1 &lt;= index1 &lt; index2 &lt;= numbers.length</code>.

Return the indices of the two numbers, <code>index1</code> and <code>index2</code>, added by one as an integer array <code>[index1, index2]</code> of length 2.

The tests are generated such that there is exactly one solution. You may not use the same element twice.

Your solution must use only constant extra space.

&nbsp;
Example 1:

<pre>
Input: numbers = [2,7,11,15], target = 9
Output: [1,2]
Explanation: The sum of 2 and 7 is 9. Therefore, index1 = 1, index2 = 2. We return [1, 2].
</pre>

Example 2:

<pre>
Input: numbers = [2,3,4], target = 6
Output: [1,3]
Explanation: The sum of 2 and 4 is 6. Therefore index1 = 1, index2 = 3. We return [1, 3].
</pre>

Example 3:

<pre>
Input: numbers = [-1,0], target = -1
Output: [1,2]
Explanation: The sum of -1 and 0 is -1. Therefore index1 = 1, index2 = 2. We return [1, 2].
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>2 &lt;= numbers.length &lt;= 3 * 104</code></li>
	<li><code>-1000 &lt;= numbers[i] &lt;= 1000</code></li>
	<li><code>numbers</code> is sorted in non-decreasing order.</li>
	<li><code>-1000 &lt;= target &lt;= 1000</code></li>
	<li>The tests are generated such that there is exactly one solution.</li>
</ul>

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