https://www.cnblogs.com/huashanqingzhu/p/7278930.html
http://bailian.openjudge.cn/practice/1222
1222:EXTENDED LIGHTS OUT
It took me a lot of time to figure out this question. The more d
https://www.cnblogs.com/huashanqingzhu/p/7278930.html
http://bailian.openjudge.cn/practice/1222
1222:EXTENDED LIGHTS OUT
It took me a lot of time to figure out this question. The more d