Private submission
Private submission won't be visible to other users and
won't be taken into consideration in ranks.
won't be taken into consideration in ranks.
Disqualify submission
Your submission will be disqualified. Operation
is not reversible.
is not reversible.
Public submission
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Source code of every submission to this problem
in this contest is public.
Source code of every submission to this problem
in this contest is public.
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VOI 2011 Hình chữ nhật bốn màu
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