贪婪法是一种不追求最优解，只希望得到较为满意解的方法。贪婪法一般可以快速得到满意的解，因为它省去了为找最优解要穷尽所有可能而必须耗费的大量时间。贪婪法常以当前情况为基础作最优选择，而不考虑各种可能的整体情况，所以贪婪法不要回溯。-Greedy method is a non-pursuit of the optimal solution, just want to be more satisfied with the solution method. Greed in general, can quickly obtain a satisfactory solution, because it eliminates the need to find the optimal solution to the exhaustion of all possible must be spent a lot of time. Greedy method often based on the current situation to make optimal choices, without taking into account a whole range of possible circumstances, and is therefore not the greed of law retroactive.