CF1976D Invertible Bracket Sequences
Description
A regular bracket sequence is a bracket sequence that can be transformed into a correct arithmetic expression by inserting characters '1' and '+' between the original characters of the sequence. For example:
- bracket sequences "()()" and "(())" are regular (the resulting expressions are: "(1)+(1)" and "((1+1)+1)");
- bracket sequences ")(", "(" and ")" are not.
Let's define the inverse of the bracket sequence as follows: replace all brackets '(' with ')', and vice versa (all brackets ')' with '('). For example, strings "()((" and ")())" are inverses of each other.
You are given a regular bracket sequence $ s $ . Calculate the number of pairs of integers $ (l,r) $ ( $ 1 \le l \le r \le |s| $ ) such that if you replace the substring of $ s $ from the $ l $ -th character to the $ r $ -th character (inclusive) with its inverse, $ s $ will still be a regular bracket sequence.
Input Format
The first line contains a single integer $ t $ ( $ 1 \le t \le 10^4 $ ) — the number of test cases.
The only line of each test case contains a non-empty regular bracket sequence; it consists only of characters '(' and/or ')'.
Additional constraint on the input: the total length of the regular bracket sequences over all test cases doesn't exceed $ 2 \cdot 10^5 $ .
Output Format
For each test case, print a single integer — the number of pairs $ (l,r) $ meeting the conditions from the statement.
Explanation/Hint
In the first example, there is only one pair:
- $ (2, 3) $ : (()) $ \rightarrow $ ()().
In the second example, there are no pairs.
In the third example, there are three pairs:
- $ (2, 3) $ : ()()() $ \rightarrow $ (())();
- $ (4, 5) $ : ()()() $ \rightarrow $ ()(());
- $ (2, 5) $ : ()()() $ \rightarrow $ (()());