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Contest is running
2023 Post World Finals Online ICPC Challenge powered by Huawei
10 days
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Before contest
Codeforces Round 944 (Div. 4)
01:12:37
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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
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greedy
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implementation
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matrices
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ternary search
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Problems
#
Name
579A
Raising Bacteria
bitmasks
1000
x56332
1915A
Odd One Out
bitmasks
,
implementation
800
x49757
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38561
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x35959
1527A
And Then There Were K
bitmasks
800
x33933
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31094
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x29062
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x28586
1698A
XOR Mixup
bitmasks
,
brute force
800
x27860
1421A
XORwice
bitmasks
,
greedy
,
math
800
x27263
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27134
1097B
Petr and a Combination Lock
bitmasks
,
brute force
,
dp
1200
x26605
1420B
Rock and Lever
bitmasks
,
math
1200
x23689
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x22797
1635A
Min Or Sum
bitmasks
,
greedy
800
x22083
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21628
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21514
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x21478
1805A
We Need the Zero
bitmasks
,
brute force
800
x21051
1632B
Roof Construction
bitmasks
,
constructive algorithms
1000
x20851
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x20810
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x20412
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x19489
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19179
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19100
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19096
1594B
Special Numbers
bitmasks
,
math
1100
x18890
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x18758
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x18368
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18361
1696A
NIT orz!
bitmasks
,
greedy
800
x18325
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x18098
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x17855
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17707
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x17317
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x17222
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x17030
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x17015
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x16989
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x16949
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x16398
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16100
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16043
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15877
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x15860
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15835
1095C
Powers Of Two
bitmasks
,
greedy
1400
x15778
1634B
Fortune Telling
bitmasks
,
math
1400
x15666
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15656
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15267
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15221
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x15200
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x14648
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x14640
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x14450
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14266
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x14222
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14215
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14176
1630A
And Matching
bitmasks
,
constructive algorithms
1500
x14072
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x13947
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13876
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x13746
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13643
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x13591
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13566
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13509
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13344
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x13243
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13180
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x12982
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12589
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12553
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12537
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12417
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12245
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12215
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12008
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11862
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11840
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x11586
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11524
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11376
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11340
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11216
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11078
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10777
484A
Bits
bitmasks
,
constructive algorithms
1700
x10697
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x10687
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10620
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x10382
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10026
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x10019
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9911
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x9869
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9786
1775C
Interesting Sequence
bitmasks
,
math
1600
x9654
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9284
580D
Kefa and Dishes
bitmasks
,
dp
1800
x9177
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9160
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