A - 家具の配置 (Furniture)
Time Limit: 2 sec / Memory Limit: 512 MiB
Source Name
JOI Open Contest 2020 問題 1
B - 白黒の点 (Monochrome Points)
Time Limit: 2 sec / Memory Limit: 512 MiB
Source Name
JOI Open Contest 2020 問題 2
C - 発電所 (Power Plant)
Time Limit: 1 sec / Memory Limit: 512 MiB