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Before contest
Codeforces Round 945 (Div. 2)
38:08:55
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Difficulty:
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bitmasks
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Status
Standings
Custom test
Problems
#
Name
579A
Raising Bacteria
bitmasks
1000
x56474
1915A
Odd One Out
bitmasks
,
implementation
800
x50011
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38711
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x36027
1527A
And Then There Were K
bitmasks
800
x33977
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31145
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x29096
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x28653
1698A
XOR Mixup
bitmasks
,
brute force
800
x27895
1421A
XORwice
bitmasks
,
greedy
,
math
800
x27321
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27184
1097B
Petr and a Combination Lock
bitmasks
,
brute force
,
dp
1200
x26679
1420B
Rock and Lever
bitmasks
,
math
1200
x23744
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x22868
1635A
Min Or Sum
bitmasks
,
greedy
800
x22100
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21665
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21536
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x21534
1805A
We Need the Zero
bitmasks
,
brute force
800
x21143
1632B
Roof Construction
bitmasks
,
constructive algorithms
1000
x20899
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x20837
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x20427
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x19529
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19192
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19120
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19113
1594B
Special Numbers
bitmasks
,
math
1100
x18925
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x18786
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x18385
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18383
1696A
NIT orz!
bitmasks
,
greedy
800
x18345
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x18131
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x17863
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17745
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x17333
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x17257
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x17059
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x17030
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17014
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x16960
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x16464
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16132
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16066
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15899
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x15892
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15863
1095C
Powers Of Two
bitmasks
,
greedy
1400
x15805
1634B
Fortune Telling
bitmasks
,
math
1400
x15702
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15697
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15288
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15241
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x15230
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14969
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x14658
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x14481
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x14313
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14296
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14230
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14206
1630A
And Matching
bitmasks
,
constructive algorithms
1500
x14087
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13958
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x13955
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x13788
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13697
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13656
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x13606
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13529
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13365
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x13282
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13219
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x13002
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12617
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12603
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12594
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12432
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12259
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12236
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12058
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11872
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11854
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x11593
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11533
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11419
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11390
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11233
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11132
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10801
484A
Bits
bitmasks
,
constructive algorithms
1700
x10705
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x10692
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10635
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x10417
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10092
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x10038
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9922
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x9895
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9792
1775C
Interesting Sequence
bitmasks
,
math
1600
x9680
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9294
580D
Kefa and Dishes
bitmasks
,
dp
1800
x9196
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9166
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