[Educational Codeforces Round 6][Codeforces 620E]New Year Tree

[Codeforces Round #447][Codeforces 894C]Marco and GCD Sequence

[Codeforces Round #447][Codeforces 894E]Ralph and Mushrooms

[Codeforces Round #445][Codeforces 886D]Restoration of string

[Codeforces Round #445][Codeforces 886E]Maximum Element

[Codeforces Round #445][Codeforces 886C]Petya and Catacombs

[Educational Codeforces Round 32][Codeforces 888E]Maximum Subsequence

[2017-2018 ACM-ICPC, NEERC, Southern Subregional Contest][Codeforces 883 M]Quadcopter Competition

[2017-2018 ACM-ICPC, NEERC, Southern Subregional Contest][Codeforces 883 G]Orientation of Edges

[2017-2018 ACM-ICPC, NEERC, Southern Subregional Contest][Codeforces 883 F]Lost in Transliteration