Heatwave

Time Limit	Memory Limit	Input File	Output File
1 second	256 MiB	`heatin.txt`	`heatout.txt`

- Subtask 1 (50 points) has 11 cases.
- Subtask 2 (25 points) has 16 cases.
- Subtask 3 (25 points) has 23 cases.