Codeforces Round #667 (Div. 3)
Codeforces Round #667 (Div. 3)
Codeforces Round #667 (Div. 3)
Codeforces Round #636 (Div. 3
Codeforces Round #634 (Div. 3)
Codeforces Round #624 (Div. 3)
Codeforces Round #615 (Div. 3)
Codeforces Round #598 (Div. 3)
Codeforces Round #595 (Div. 3)
Codeforces Round #582 (Div. 3)
Codeforces Round #575 (Div. 3)
Codeforces Round #570 (Div. 3)
Codeforces Round #565 (Div. 3)
Codeforces Round #560 (Div. 3)
Codeforces Round #529 (Div. 3)
Codeforces Round #555 (Div. 3)
Codeforces Round #552 (Div. 3)
CodeForces #550(div3)
CodeForces #547 Div3
Codeforces Round #535 (Div. 3)