Street Construction — ORAC

Time Limit	Memory Limit	Input File	Output File
1 second	256 MiB	`streetin.txt`	`streetout.txt`

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Problem info

- Subtask 1 (35 points) has 8 cases.
- Subtask 2 (15 points) has 1 case.
- Subtask 3 (15 points) has 8 cases.
- Subtask 4 (15 points) has 9 cases.
- Subtask 5 (20 points) has 36 cases.