Corporate Flight Bookings
<p>There are <code>n</code> flights that are labeled from <code>1</code> to <code>n</code>.</p>

<p>You are given an array of flight bookings <code>bookings</code>, where <code>bookings[i] = [first<sub>i</sub>, last<sub>i</sub>, seats<sub>i</sub>]</code> represents a booking for flights <code>first<sub>i</sub></code> through <code>last<sub>i</sub></code> (<strong>inclusive</strong>) with <code>seats<sub>i</sub></code> seats reserved for <strong>each flight</strong> in the range.</p>

<p>Return <em>an array </em><code>answer</code><em> of length </em><code>n</code><em>, where </em><code>answer[i]</code><em> is the total number of seats reserved for flight </em><code>i</code>.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>

<pre>
<strong>Input:</strong> bookings = [[1,2,10],[2,3,20],[2,5,25]], n = 5
<strong>Output:</strong> [10,55,45,25,25]
<strong>Explanation:</strong>
Flight labels:        1   2   3   4   5
Booking 1 reserved:  10  10
Booking 2 reserved:      20  20
Booking 3 reserved:      25  25  25  25
Total seats:         10  55  45  25  25
Hence, answer = [10,55,45,25,25]
</pre>

<p><strong class="example">Example 2:</strong></p>

<pre>
<strong>Input:</strong> bookings = [[1,2,10],[2,2,15]], n = 2
<strong>Output:</strong> [10,25]
<strong>Explanation:</strong>
Flight labels:        1   2
Booking 1 reserved:  10  10
Booking 2 reserved:      15
Total seats:         10  25
Hence, answer = [10,25]

</pre>

<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;= n &lt;= 2 * 10<sup>4</sup></code></li>
	<li><code>1 &lt;= bookings.length &lt;= 2 * 10<sup>4</sup></code></li>
	<li><code>bookings[i].length == 3</code></li>
	<li><code>1 &lt;= first<sub>i</sub> &lt;= last<sub>i</sub> &lt;= n</code></li>
	<li><code>1 &lt;= seats<sub>i</sub> &lt;= 10<sup>4</sup></code></li>
</ul>
Array; Prefix Sum
func corpFlightBookings(bookings [][]int, n int) []int {
	ans := make([]int, n)
	for _, e := range bookings {
		first, last, seats := e[0], e[1], e[2]
		ans[first-1] += seats
		if last < n {
			ans[last] -= seats
		}
	}
	for i := 1; i < n; i++ {
		ans[i] += ans[i-1]
	}
	return ans
}