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.
\n\n\n
Example 1:
\n\n\nInput: people = [1,2], limit = 3\nOutput: 1\nExplanation: 1 boat (1, 2)\n\n\n
Example 2:
\n\n\nInput: people = [3,2,2,1], limit = 3\nOutput: 3\nExplanation: 3 boats (1, 2), (2) and (3)\n\n\n
Example 3:
\n\n\nInput: people = [3,5,3,4], limit = 5\nOutput: 4\nExplanation: 4 boats (3), (3), (4), (5)\n\n\n
\n
Constraints:
\n\n1 <= people.length <= 5 * 1041 <= people[i] <= limit <= 3 * 104给定数组 people 。people[i]表示第 i 个人的体重 ，船的数量不限，每艘船可以承载的最大重量为 limit。
每艘船最多可同时载两人，但条件是这些人的重量之和最多为 limit。
返回 承载所有人所需的最小船数 。
\n\n\n\n
示例 1：
\n\n\n输入：people = [1,2], limit = 3\n输出：1\n解释：1 艘船载 (1, 2)\n\n\n
示例 2：
\n\n\n输入：people = [3,2,2,1], limit = 3\n输出：3\n解释：3 艘船分别载 (1, 2), (2) 和 (3)\n\n\n
示例 3：
\n\n\n输入：people = [3,5,3,4], limit = 5\n输出：4\n解释：4 艘船分别载 (3), (3), (4), (5)\n\n
\n\n
提示：
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