Time Warp

Time Limit	Memory Limit	Input File	Output File
1 second	256 MiB	`Standard Input`	`Standard Output`

- Subtask 1 (10 points) has 7 cases.
- Subtask 2 (20 points) has 7 cases.
- Subtask 3 (35 points) has 10 cases.
- Subtask 4 (35 points) has 18 cases.