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Problem info
- Subtask 1 (10 points) has 1 case.
- Subtask 2 (10 points) has 1 case.
- Subtask 3 (10 points) has 1 case.
- Subtask 4 (10 points) has 1 case.
- Subtask 5 (10 points) has 1 case.
- Subtask 6 (10 points) has 1 case.
- Subtask 7 (10 points) has 1 case.
- Subtask 8 (10 points) has 1 case.
- Subtask 9 (10 points) has 1 case.
- Subtask 10 (10 points) has 1 case.
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