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

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

[2017-2018 ACM-ICPC, NEERC, Southern Subregional Contest][Codeforces 883 E]Field of Wonders