2019-11-10 training summary

Recently, I have done the problems of line segment tree and tree array, and reviewed the knowledge I have learned from the problems I have done in the past two weeks . I feel that it is faster to make a line segment tree than a string . Segment trees sometimes need to change their thinking , Clever thinking can achieve good results . It is an opportunity to sum up . I am also learning suffix automata and ac automata , I don't know much about this one , Finish the line segment tree and practice suffix automata and ac automata .