Build a String
Digit Holes
Digit Permutation
Distinct Rotations
Equidistant Points
Boundless Software
Codeforces Round 814 (Div. 1) A2. Burenka and Traditions (hard version)
Codeforces Round 814 (Div. 1) A1. Burenka and Traditions (easy version)
Codeforces Round 815 (Div. 2) D2. Xor-Subsequence (hard version)
Codeforces Round 815 (Div. 2) D1. Xor-Subsequence (easy version)