• Contacted by a recruiter for a hiring event in Dublin.
• Received a HackerRank test with 3 questions to be completed within 90 minutes.
• Passed the test without issue and was invited for an onsite stage.
• Later passed on the opportunity as they proposed a better-located position; the original was for a Dublin hiring event.
• My application was passed to another recruiter. I scheduled my onsite with them. A week before my onsite, I received an email stating the position I was interviewing for was already filled, so no onsite.
• Fast forward a couple of months: the same recruiter contacted me about another position for the same location. This time, they set up an interview with the hiring manager before the onsite.
• The recruiter said it would be a casual chat and behavioral. It wasn't; I received coding questions during the session, along with behavioral questions.
• Passed the hiring manager stage and was again invited for an onsite. I selected the date and time for the onsite and started preparing.
• A week before the onsite, I again received an email stating, "Sorry, position filled, no onsite."

Very unorganized hiring process and unprofessional that they revoked my planned onsite twice. Stay away.

Check if the given tree is symmetric.