[LeetCode] Boats to Save People 渡人的船

The?i-th person has weight?people[i], and each boat can carry a maximum weight of?limit.

Each boat carries at most 2 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.? (It is guaranteed each person can be carried by a boat.)

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)

Note:

• 1 <=?people.length <= 50000
• 1 <= people[i] <=?limit <= 30000

参考资料：

https://leetcode.com/problems/boats-to-save-people/

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原文地址：https://www.cnblogs.com/grandyang/p/10854377.html