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[Codeforces]762F - Tree nesting

[Codeforces]487E - Tourists

[Codeforces]862F - Mahmoud and Ehab and the final stage

[Codeforces]856E - Satellites

[Codeforces]856C - Eleventh Birthday

[Codeforces]856D - Masha and Cactus

[UOJ]#33. UR #2树上GCD

[Codeforces]850E - Random Elections

[Codeforces]852I - Dating

[UOJ]#36. 清华集训2014玛里苟斯

[BZOJ]4755: [Jsoi2016]扭动的回文串

[Codeforces]848C - Goodbye Souvenir

APIO 2016

APIO 2013

APIO 2014