Nav — ORAC

Time Limit	Memory Limit
4.0 seconds	1024.0 MiB

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Problem info

- Subtask 1 (7 points) has 5 cases.
- Subtask 2 (15 points) has 2 cases.
- Subtask 3 (26 points) has 9 cases.
- Subtask 4 (52 points) has 15 cases.
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