Codeforces div 4 solutions July 8, 2019 16 32 64 128 Codeforces round 971 div 4 solutions Codeforces round 952 div 4 solutions Codeforces round 993 div 4 solutions Codeforces round 964 div 4 solutions Codeforces round 898 div 4 solutions Div 4 codeforces
