on April 28, 2020, 3:25 p.m.
on April 27, 2020, 8:03 p.m.
on April 27, 2020, 10:05 p.m.
on April 29, 2020, 3:41 p.m.
on April 28, 2020, 3:32 p.m.
2.Cơ bản-Ngôn ngữ lập trình (1.120 points)
3.Cơ bản-Phương pháp tính (1 points)
4.Cơ bản-Thuật toán (7 points)
7.Nâng cao-Thử thách (2 points)
