We are given a rooted tree with 'n' vertices, where , n<=10^5.
For the problem : Count the number of paths in a tree with sum=k .
I don't know its efficient solution.
And now the new problem is : —
Count the number of pair of paths in a rooted tree with sum=k.
Example, say the path(2-5) in a tree has sum=8, and another path (7-9) in the same tree has sum=9.
So the pair of paths:- {(2-5),(7-9)} has a sum=8+9=17.
Can I get some ideas on how to solve both of these problems ?