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21：Assign Cookies

Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie. Each child i has a greed factor g_i, which is the minimum size of a cookie that the child will be content with; and each cookie j has a size s_j. If s_j >= g_i, we can assign the cookie j to the child i, and the child i will be content. Your goal is to maximize the number of your content children and output the maximum number.

此题：分点心。每个小孩i期望获得g[i]块点心。你有多种不同口味的点心s[]。你只能分配一种口味的点心给一个小孩而且点心数量大于g[i]小孩i才会满意。问你最多能满足多少个小孩？

思路：对小孩的期望数组与拥有的点心数组按升序排列，从需求小的小孩开始逐个满足：针对当前需求，检索还没分配的点心数组，把第一个能满足需求的点心分给这个小孩。