Task Dependency

Aman wants to do specific task from the list of n tasks(t1,t2,t3.....tn).To do some task ti that depends on some other task tj, he must first do task tj before doing ti. Q queries are fired, each query consists of n tasks, a list of tasks that depends on n task, and a list of the m indices of the task he want to perform. For each query 1. Find the minimum number of tasks that must do in order to p