http://www.bubuko.com/so/1/lld
http://www.bubuko.com/infodetail-2613355.html

K题解+拓展
http://www.mamicode.com/info-detail-2308180.html

https://www.cnblogs.com/565261641-fzh/p/9070958.html
西安邀请赛
icpc–camp
https://post.icpc.camp/

max型线段树
https://blog.csdn.net/nameofcsdn/article/details/80641992

双向bfs+拼图
https://www.cnblogs.com/simplc/p/6705036.html

https://blog.csdn.net/Kamisama123/article/details/77947111