Problems
 
 
# Name    
A
standard input/output
1 s, 1024 MB
Submit  x107
B
standard input/output
1 s, 1024 MB
Submit  x95
C
standard input/output
1 s, 1024 MB
Submit  x85
D
standard input/output
1 s, 1024 MB
Submit  x75
E
standard input/output
1 s, 1024 MB
Submit  x19
F
standard input/output
2 s, 1024 MB
Submit  x5
G
standard input/output
2 s, 1024 MB
Submit  x1
H
standard input/output
3 s, 1024 MB
Submit  x1
I
standard input/output
9 s, 1024 MB
Submit  x4
J
standard input/output
1 s, 1024 MB
Submit  x22
K
standard input/output
1 s, 1024 MB
Submit  x2
L
standard input/output
2 s, 1024 MB
Submit  x5
M
standard input/output
1 s, 1024 MB
Submit  x42
N
standard input/output
2 s, 1024 MB
Submit  x8
O
standard input/output
3 s, 1024 MB
Submit  x1
Complete problemset
 
 
 
 
Questions about problems
 
 
  Question Answer
2026-07-10 20:35:08
Problem H. Square the Circle
*****
Announcement
The following statements should be corrected as: Kevin: a lattice square centered at $(0,0)$, whose vertices are all lattice points (integer coordinates). All coordinate absolute values are less than ** or equal to ** $10^5$. The square is guaranteed to be non-degenerate, i.e., its side length is at least $1$.
2026-01-22 21:57:14
Problem I. Chromatic Complex
*****
Announcement
Time Limit Modified. 6s -> 9s.
2025-12-08 11:04:56
Problem A. Golden Alleyway
*****
Announcement
Contest files(including gen, val, checker and jury solutions) can be found on https://github.com/KethGeorge/ecustpc_2025_datas