No gossip. In this problem I will just say what to do. Initially, you will be given a bracket sequence of length N. Then there will be some queries. In each query you will be given two integers l, r (1 ≤ l ≤ r ≤ N). You will have to find the maximum length of balanced bracket substring that starts from index l and ends not after index r. Here substring means a continious sub-part of a string.
In the first line there will be an integer N (1 ≤ N ≤ 5×105). Then there will be a string of length N containing only characters ‘(’ or ‘)’. In next line there will be an integer Q (1 ≤ Q ≤ 106) indicating the number of queries. Then each of the Q lines will contain two integers l and r (1 ≤ l ≤ r ≤ N) as described in statement.
For each query print the maximum length of continuous bracket sequence that is balanced and starts from index l and ends not after index r.
10 ()(())())( 5 1 9 1 1 1 2 9 10 2 5
8 0 2 0 0
You can learn more about balanced bracket sequence from here.