COLORS-Tìm màu
/ckfinder/userfiles/files/VOI20192020/LMH%20buoi%202.pdf
Input
9 3 1 2 3 4 1 2 3 4 5 1 5 4 6 1 4 3 6 1 9 1 9
Output
3 OK
6
Nguồn: LMH'1920