贪心法的基本思路： ——从问题的某一个初始解出发逐步逼近给定的目标，以尽可能快的地求得更好的解。当达到某算法中的某一步不能再继续前进时，算法停止。-Greedy basic idea:- from the question of a gradual solution of the initial approximation to set targets to as quickly as possible to seek a bett