codeforces
Wed Sep 16 2020
Educational Codeforces 95 B - Negative Prefixes
Sat Aug 22 2020
Codeforces #663 Div.2 D.505
Tue Aug 4 2020
Educational Codeforces Round 92 C. Good String
Tue Jul 21 2020
Educational Codeforces Round 89 D. Two Divisors
Mon Jun 15 2015
Codeforces Round 308 (Div.2), ARC040