North American Invitational Programming Contest 2018
Problem A
Unsolved.
Problem B
Unsolved.
Problem C
Upsolved by Xiejiadong.
Problem D
Solved by Xiejiadong. 00:11:06(+)
Problem E
Unsolved.
Problem F
Unsolved.
Problem G
Unsolved.
Problem H
Unsolved.
Problem I
Unsolved.
Problem J
Unsolved.
Problem K
Unsolved.