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Codeforces and Polygon may be unavailable from
May 23, 4:00 (UTC)
to
May 23, 8:00 (UTC)
due to technical maintenance.
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7D
Palindrome Degree
hashing
,
strings
2200
x3523
5C
Longest Regular Bracket Sequence
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
,
strings
1900
x12743
5B
Center Alignment
implementation
,
strings
1200
x5550
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