boats-to-save-people

Boats to Save People

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numRescueBoats

You are given an array <code>people</code> where <code>people[i]</code> is the weight of the <code>ith</code> person, and an infinite number of boats where each boat can carry a maximum weight of <code>limit</code>. Each boat carries at most two people at the same time, provided the sum of the weight of those people is at most <code>limit</code>.

Return the minimum number of boats to carry every given person.

&nbsp;
Example 1:

<pre>
Input: people = [1,2], limit = 3
Output: 1
Explanation: 1 boat (1, 2)
</pre>

Example 2:

<pre>
Input: people = [3,2,2,1], limit = 3
Output: 3
Explanation: 3 boats (1, 2), (2) and (3)
</pre>

Example 3:

<pre>
Input: people = [3,5,3,4], limit = 5
Output: 4
Explanation: 4 boats (3), (3), (4), (5)
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>1 &lt;= people.length &lt;= 5 * 104</code></li>
	<li><code>1 &lt;= people[i] &lt;= limit &lt;= 3 * 104</code></li>
</ul>

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