Supporting Institution:
Organizer:   CityU CS, HKACE         Co-organizer:   HKOI
Fully Supported By:     HKAGE
Supported by: Pui Ching Middle School, Wah Yan College Kowloon,
Yan Oi Ting Tin Ka Ping Sec. School




  • Supported Languages:
    Each submitted source program must be written in C++/PYTHON/ JAVA/GO/C/PASCAL.
  • Participants:
    A contestant is a student who:
    • was enrolled in a school at a level not higher than secondary education in Hong Kong.
  • Competition mode:
    Individual competition
  • Regulations:
    The contest is in a similar form to the international olympiad informatics (IOI) contest.
  • There are six tasks in the daily competition. Each task has multiple subtasks. The contestants need to pass all test cases of the subtask to obtain the corresponding marks. There is no limit to the number of submissions for each task and no penalty for multiple submissions. Only the last submission of each task counts towards the grade. For every submission, the grading system reports the score for each subtask as well as the feedback. If a subtask is not fully solved, the grading system gives the feedback only for the first test case among the lowest scored test cases in the subtask. The feedback includes the test case number and one of the following reasons:
    1. Runtime Error
    2. Wrong Answer
    3. Time Limit Exceeded
    4. Memory Limit Exceeded
    5. Output Limit Exceeded
    During the contest, the contestants can access the standings and see the real-time ranking.
  • Can not use search engine and AI tools like ChatGPT
  • Allowed Language References:
    Participants can refer to these websites at any time during the competition.