# 1109. Corporate Flight Bookings

#### Medium

***

There are `n` flights that are labeled from `1` to `n`.

You are given an array of flight bookings `bookings`, where `bookings[i] = [firsti, lasti, seatsi]` represents a booking for flights `firsti` through `lasti` (**inclusive**) with `seatsi` seats reserved for **each flight** in the range.

Return *an array* `answer` *of length* `n`*, where* `answer[i]` *is the total number of seats reserved for flight* `i`.

 

**Example 1:**

```
Input: bookings = [[1,2,10],[2,3,20],[2,5,25]], n = 5
Output: [10,55,45,25,25]
Explanation:
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]
```

**Example 2:**

```
Input: bookings = [[1,2,10],[2,2,15]], n = 2
Output: [10,25]
Explanation:
Flight labels:        1   2
Booking 1 reserved:  10  10
Booking 2 reserved:      15
Total seats:         10  25
Hence, answer = [10,25]
```

 

**Constraints:**

* `1 <= n <= 2 * 104`
* `1 <= bookings.length <= 2 * 104`
* `bookings[i].length == 3`
* `1 <= firsti <= lasti <= n`
* `1 <= seatsi <= 104`

```python
class Solution:
    def corpFlightBookings(self, bookings: List[List[int]], n: int) -> List[int]:
        l = [0]*(n+1)
        for first, last, seats in bookings:
            l[first-1] += seats
            l[last] -= seats
        for index in range(1, n):
            l[index] += l[index-1]
        return l[:n]
```