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

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

Example 1:

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

Example 2:

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

Example 3:

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

Constraints:

- `1 <= people.length <= 5 * 104`
- `1 <= people[i] <= limit <= 3 * 104`