Я раз 10 прочитал задачу, и до сих пор не понял, что от меня требуется(((((

Автору зачОт))))

+1 :))) Very bad statements and hard to understand :(((
2admin : Author's solution used all numbers or not?

You are to find distance between two nodes in tree.
D and E - heights of these nodes;
Ep and Dp - numbers of leaves which are nearest to these nodes (in this tree only leaves are numbered);
F - height of the tree.

Thanks I got AC, but statements is hard to understand :(