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Let’s say there are many vehicles on a long road. At each mile along the road, a checkpoint indicates the length traveled across the road.

You are given a list called <code>vehicles</code> which indicates the number of vehicles between each checkpoint. For example, the list <code>[7,4,3]</code> would mean that there are seven vehicles before the first checkpoint, four vehicles between the first and second checkpoints, and three vehicles between the second and third checkpoints.

Write a function <code>range_vehicles</code> that will give the number of vehicles between the <code>start</code> and <code>end</code> checkpoints.

Note: <code>start</code> may be <code>0</code>

Example:

Input:

<pre tabindex="0" class="chroma"><code>vehicles = [5, 6, 4, 2, 1]
start = 1
end = 3
</code></pre>

Output:

<pre tabindex="0" class="chroma"><code>range_vehicles(vehicles,start,end) -&gt; 10
</code></pre>

Counting Vehicles

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