Attention: The time limit was revised to 2.5 seconds.
The size of the input file does not exceed 0.1 MiB.
QOJ.ac
QOJ
QOJ is currently under a maintenance. It might be unavailable in the following a few hours.
Time Limit:
2.5 s
Memory Limit:
512 MB
# 3070. Alien invaders
统计
The problem was used in the following contest: