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COCI stands for the Croatian Open Competition in Informatics. It is an annual competitive programming contest for high school students in Croatia and the surrounding region. Since its inception in the late 1990s, it has become the country’s leading arena for training young programmers and for identifying talent for international contests. The competition is organized by Croatian educational and computer science communities and reaches a national scale through schools and clubs.

The contest consists of a series of online rounds throughout the school year, culminating in a final

Top performers receive medals and sometimes scholarships or internships. COCI also serves as the main route

round
typically
held
in
Croatia.
In
each
round,
participants
work
to
implement
efficient
algorithms
to
solve
a
set
of
problems
within
strict
time
and
memory
limits.
Submissions
are
evaluated
by
an
automated
judge
that
verifies
correctness
and
performance.
Contestants
may
use
a
variety
of
programming
languages,
with
C++,
Java,
and
other
common
languages
supported
by
the
judge.
for
selecting
Croatia’s
team
for
the
International
Olympiad
in
Informatics
(IOI).
Over
the
years,
the
competition
has
helped
to
cultivate
a
community
of
competitive
programmers
in
Croatia
and
the
region,
contributing
to
education,
research,
and
industry.