This is my own According to online information on this question, combined with their understanding of the summary of a solution to a problem.
Because it is in typora written inside, not directly stick around, directly put pictures.
Writing is not too good, no one should want to turn it .....
However, to turn, then please ask for my consent (after all, so many things I would like to study for two days, and wrote a morning, not easy)
I picked in the text part of the certification process IOI2018 Cai Chengze Team work, study this question during the reference section of the park user blog solution to a problem "T_Y_P_E", and to express my gratitude.
There are pot, then pointed out that trouble you immortal, thank you.