Practice on Toph

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Straightforward

By tanu_RUET · Limits 1s, 512 MB

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.

Input

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.

Output

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.

Sample

InputOutput
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.

Discussion

Statistics


30% Solution Ratio

EgorKulikovEarliest, 7M ago

Tashdid_trdbFastest, 0.2s

Tashdid_trdbLightest, 26 MB

Riaz_BSMRSTUShortest, 839B

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Editorial

At first, replace the given bracket sequence by an integer array a. In this array, a[i]=(count of...

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