Positive Solutions: $ rmq $ / Chairman of the tree
Report problem solving:
Portal!
It seems to have seen this problem many times very hot ,,, $ QwQ $
Prior to $ NOIp $ when $ cjk $ lecture seniors talked about this topic, then winter exam this road now and then say out under a tree and met the President of this hot topic _ (: з "∠) _
Under Hong Kong were $ rmq $ and Chairman of the tree lying on the $ QwQ $
Hong Kong to $ rmq $ lie