A Star not a Tree?

Problem statistics

  1. Submissions 273
  2. Accepted submissions 84
  3. Submission ratio 31%
  4. Authors 76
  5. Accepted authors 52
  6. Author ratio 68%
  1. Accepted
  2. Wrong Answer
  3. Time Limit Exceeded
  4. Compile Error
  5. Other

Solution running time distribution