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Before contest
Codeforces Round 941 (Div. 1)
20:42:44
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Before contest
Codeforces Round 941 (Div. 2)
20:42:45
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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
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graph matchings
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greedy
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Problems
#
Name
579A
Raising Bacteria
bitmasks
1000
x55841
1915A
Odd One Out
bitmasks
,
implementation
800
x49049
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38130
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x35682
1527A
And Then There Were K
bitmasks
800
x33803
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30954
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x28946
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x28355
1698A
XOR Mixup
bitmasks
,
brute force
800
x27726
1421A
XORwice
bitmasks
,
greedy
,
math
800
x27113
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x26969
1097B
Petr and a Combination Lock
bitmasks
,
brute force
,
dp
1200
x26492
1420B
Rock and Lever
bitmasks
,
math
1200
x23537
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x22632
1635A
Min Or Sum
bitmasks
,
greedy
800
x22026
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21553
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21409
1567B
MEXor Mixup
bitmasks
,
greedy
1000
x21356
1805A
We Need the Zero
bitmasks
,
brute force
800
x20873
1632B
Roof Construction
bitmasks
,
constructive algorithms
1000
x20764
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x20582
1494A
ABC String
bitmasks
,
brute force
,
implementation
900
x20385
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x19388
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19137
1566B
MIN-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
800
x19061
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19021
1594B
Special Numbers
bitmasks
,
math
1100
x18775
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x18697
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x18299
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x18280
1696A
NIT orz!
bitmasks
,
greedy
800
x18072
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x18011
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x17835
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17594
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x17271
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x17100
1566C
MAX-MEX Cut
bitmasks
,
constructive algorithms
,
dp
,
greedy
1000
x16986
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x16958
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x16934
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x16932
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x16060
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16030
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x15956
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15831
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x15766
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15743
1095C
Powers Of Two
bitmasks
,
greedy
1400
x15672
1634B
Fortune Telling
bitmasks
,
math
1400
x15583
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15555
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15225
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15153
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x15102
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x14608
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x14377
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14201
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14199
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14119
1630A
And Matching
bitmasks
,
constructive algorithms
1500
x14038
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x13920
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x13917
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x13690
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13682
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x13572
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13525
1395C
Boboniu and Bit Operations
bitmasks
,
brute force
,
dp
,
greedy
1600
x13490
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
x13417
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13308
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13283
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x13145
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13101
276D
Little Girl and Maximum XOR
bitmasks
,
dp
,
greedy
,
implementation
,
math
1700
x12910
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12540
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12459
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12408
1554B
Cobb
bitmasks
,
brute force
,
greedy
,
math
1700
x12386
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12221
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12172
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11822
1567C
Carrying Conundrum
bitmasks
,
combinatorics
,
dp
,
math
1600
x11818
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x11804
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x11507
1516C
Baby Ehab Partitions Again
bitmasks
,
constructive algorithms
,
dp
,
math
1700
x11497
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11305
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11239
1368D
AND, OR and square sum
bitmasks
,
greedy
,
math
1700
x11191
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x10919
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10728
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x10672
484A
Bits
bitmasks
,
constructive algorithms
1700
x10656
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10595
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x10273
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x9949
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x9900
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9798
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x9765
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9758
1775C
Interesting Sequence
bitmasks
,
math
1600
x9597
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9236
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9134
580D
Kefa and Dishes
bitmasks
,
dp
1800
x9126
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