Problems
 
 
# Name    
A
standard input/output
1 s, 256 MB
Submit  x8925
B
standard input/output
2 s, 256 MB
Submit  x6598
C
standard input/output
1 s, 256 MB
Submit  x4262
D
standard input/output
3 s, 256 MB
Submit  x974
E
standard input/output
2 s, 256 MB
Submit  x221
F
standard input/output
2 s, 256 MB
Submit  x13
G
standard input/output
5 s, 512 MB
Submit  x114
Complete problemset
 
 
 
 
Questions about problems
 
 
  Question Answer
2020-09-14 18:37:51
Announcement
Problem B. Negative Prefixes
*****
The checker to the problem was incorrect. It's fixed now, the solutions have been rejudged.
2020-09-14 18:13:52
Announcement
Problem A. Buying Torches
*****
The explanations of some examples of problem A (since they are asked):

1) You use 9 trades of the first type, so you get 10 sticks. Then you use 5 trades of the second type, so you get 5 coals + 5 sticks.

2) You use 9 trades of the first type, so you have 370 sticks. Then you use 24 trades of the second type, so you have 58 sticks + 24 coals. 
2020-09-14 18:03:22
Announcement
Problem A. Buying Torches
*****
The problem A is rejudged, it is correct now. Unfortunately, the round will be unrated.
2020-09-14 17:47:17
Announcement
Problem A. Buying Torches
*****
The problem is fixed now and all answers are correct. All the solutions will be rejudged.
2020-09-14 17:42:32
Announcement
Problem A. Buying Torches
*****
The problem A is under investigation, will be fixed in a couple of minutes.
2020-09-14 17:40:14
Announcement
Problem A. Buying Torches
*****
You have one stick initially.