Given a balanced parentheses string S
, compute the score of the string based on the following rule:
()
has score 1AB
has scoreA + B
, where A and B are balanced parentheses strings.(A)
has score2 * A
, where A is a balanced parentheses string.
Example 1:
Input: "()"
Output: 1
Example 2:
Input: "(())"
Output: 2
Example 3:
Input: "()()"
Output: 2
Example 4:
Input: "(()(()))"
Output: 6
Note:
S
is a balanced parentheses string, containing only(
and)
.2 <= S.length <= 50
参考资料: