In IOI2013,which is just-concluded,Lijie Chen(YuukaKazami) from China won the first place.Congratulations to him!

So poor is the English translation that it messed the meaning of the problems of #147,especially 237D - T-decomposition.

Look at this sentence:_Let's define the cardinality of node xi as the number of nodes in tree s, containing in the node._ The "containing" should be changed to "contained".

What's more,this sentence:_There are obviously many distinct trees t, that are T-decompositions of the tree s._ It is quite abnormal to add "," ahead of "that".

As a result, these would mess the meaning and make our understanding difficult~