The language of this question is bit confusing .I tried too much but I can't understand. And the test case are also no so clear. If You set this type of Question Please provide explanation of anyone testcase. Thanks

This approach is in O(n) i tried to find better approcah // https://www.geeksforgeeks.org/find-the-occurrences-of-y-in-the-range-of-x/

but I cannt find any approch please suggest me..

I can't submit my question.. it is taking too much time in Queue

I m a beginner in Graph theory ... Please Helm me from where I solve problems because in the tags I got difficult problems