Phone screen - August 1st week

Q1 : 287. Find the Duplicate Number - Interviewer expected optimal - slow fast pointer solution
Q2: 71. Simplify Path variant

Q2 - Implement the change directorycmd on linux as a string
Given two args , current working dir & directery to navigate, produce the final path

Able to solve Q2, but Q1, wrote sub-optimal with Hashmap only.

Result - Reject

Recruiter did not mention about any cool-off period, mentioned like " if you're interested in other roles, you're welcome to explore our career website for other opportunities.".

does this mean no-cool off period? any ideas?