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QOJ

Time Limit: 4 s Memory Limit: 2048 MB Total points: 12

The problem was used in the following contest:

Notes: [Post-CCO edit: Subtasks 4 and 5 may not be solvable efficiently. CCO competitors were judged only on subtasks 1-3.]

请注意：由于标程存在问题，Subtask 4 与 Subtask 5 暂时未知是否可解决。因此，在评测时，我们会忽略最后两个字任务，只评测前三个子任务。也因此，本题的满分只有 12 分。