Recently I passed my google phone screen round . It was really nice experience . Interviewer was cool.

Question was asked nearly same as following :
Given a string of parentheses, Return a balanced string using minimum number of operations . 3 kind of operations can be done any number of times :- remove , add , edit.
Input : )()(()())))()((())((
output : (()(()()))()((()))

I gave expected O(N) solution . One thing I would like to add that , problem statement was not so clear as written here . After asking some clarifying questions , I got the above statement .

My concern is , if I get rejected in the onsite , after minimum how many days I can reapply ? And give me some tips to prepare for onsite .