Find Circle Number

Problem Overview

• Manage friend circles among college students and answer two query types.
• Input: arrays queryType, student1, student2 (IDs 1..n); "Friend" links two IDs, "Total" asks about two IDs.
• Output: for each "Total", return the sum of the sizes of the two students' friend groups.
• Real-world context: evolving campus social networks; from Oracle interviews, a coding interview problem and common interview question.