b-2题解

　　大体思路还是贪心，那首先肯定从2下手，因为2加的最多减的最多，而且处理完二后，就是只剩下01的话是可以相互抵消的。

　　首先处理（2，1）加的最多，然后处理（0，2）让其减的最少，然后处理（2，2）这样2就完了剩下的01抵消

　　水一篇题解

                                       /*
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                            ;           /*^w^*/        ;}