Problems
 
 
# Name    
A
standard input/output
2 s, 256 MB
Submit  x137
B
standard input/output
1 s, 256 MB
Submit  x51
C
standard input/output
0.8 s, 256 MB
Submit  x21
D
standard input/output
1 s, 256 MB
Submit  x8
E
standard input/output
1 s, 256 MB
Submit  x83
F
standard input/output
1 s, 256 MB
Submit  x117
H
standard input/output
1 s, 256 MB
Submit  
I
standard input/output
2 s, 256 MB
Submit  x82
J
standard input/output
1 s, 256 MB
Submit  x107
K
standard input/output
1 s, 256 MB
Submit  x116
L
standard input/output
0.5 s, 256 MB
Submit  x131
M
standard input/output
5 s, 256 MB
Submit  
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Questions about problems
 
 
  Question Answer
2025-08-07 03:52:13
Problem M. Impossible Numbers
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Announcement
Problem M is taken from SEERC 2023 105465I - Impossible Numbers
2025-07-28 05:34:19
Problem hidden7268E9CE23D043cvVmoPYSQ6. Agar 1D
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Dear, G has some fatal flaws. For the first test case, all the merging events happen at time less than 2. Proof:
At time 0, (1,1) and (3,1) touches, so index 1 eats index 2 and we now have:
(1,2) (10,1) (15,1) (20,1)
Knowing that "the cells continuously grows at a constant speed of 1 unit per second", the blobs can touch on non-integral time points.
So, at time 1.5:
(1, 3.5) (10, 2.5) (15, 2.5) (20, 2.5)
index 3 and index 4 touch. That leads to
(1, 3.5) (10, 5) (20, 2.5). Note that the "seemingly touching" pair (15, 2.5) and (20, 2.5) is now saved!
t = 1.75:
(1, 3.75) (10, 5.25) (20, 2.75)
index 1 and index 3 touch. So
(10, 9) (20, 2.75)
then
(10, 11.75)
The times of merging are: 0, 1.5 and 1.75 respectively.
I inspected the only accepted solution, and see that it doesn't account for growth of merged blobs properly!
Could you please take this into consideration, dear coordinators?
  
2025-07-26 22:00:01
Problem D. Cuantos trujos?
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Announcement
Problem have been rejudged.
2025-07-26 21:46:48
Problem D. Cuantos trujos?
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Announcement
We have updated the statement of problem D, it seems that the statement was not in its latest version, the changes are: - it's guaranteed that there are not three colinear points - the coordinates are up to 4*10^5
2025-07-26 18:30:57
Problem J. Sargento Camelas Rico
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Announcement
El enunciado del problema J ha cambiado. (son 5! permutaciones en lugar de 5)