## Algorithm

Problem Name: 1109. Corporate Flight Bookings

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

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

Constraints:

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

## Code Examples

### #1 Code Example with Java Programming

Code - Java Programming

class Solution {
public int[] corpFlightBookings(int[][] bookings, int n) {
int[] ans = new int[n];

for (int[] booking : bookings) {
int tickets = booking[2];
int from = booking[0];
int to = booking[1];

ans[from - 1] += tickets;
if (to  <  n) {
ans[to] -= tickets;
}
}

int currSum = 0;
for (int i = 0; i  <  n; i++) {
currSum += ans[i];
ans[i] = currSum;
}

return ans;
}
}
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Input

cmd
bookings = [[1,2,10],[2,3,20],[2,5,25]], n = 5

Output

cmd
[10,55,45,25,25]

### #2 Code Example with Javascript Programming

Code - Javascript Programming

const corpFlightBookings = function(bookings, n) {
const arr = Array(n + 2).fill(0)
for(const [s, e, num] of bookings) {
arr[s] += num
arr[e + 1] -= num
}
for(let i = 1; i  <  n + 2; i++) {
arr[i] += arr[i - 1]
}
arr.pop()
arr.shift()
return arr
};
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Input

cmd
bookings = [[1,2,10],[2,3,20],[2,5,25]], n = 5

Output

cmd
[10,55,45,25,25]

### #3 Code Example with Python Programming

Code - Python Programming

class Solution:
def corpFlightBookings(self, bookings: List[List[int]], n: int) -> List[int]:
res = [0] * n
i = cur = 0
for j, val in sorted([[i - 1, k] for i, j, k in bookings] + [[j, -k] for i, j, k in bookings]):
while i < j:
res[i] = cur
i += 1
cur += val
return res
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Input

cmd
bookings = [[1,2,10],[2,2,15]], n = 2

Output

cmd
[10,25]