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Before contest
Codeforces Round #605 (Div. 3)
6 days
→ Filter Problems
Difficulty:
—
matrices
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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Problems
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Custom test
Problems
#
Name
578F
Mirror Box
matrices
,
trees
3400
x126
1184D2
Parallel Universes (Hard)
math
,
matrices
3300
x20
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x83
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3200
x58
446E
DZY Loves Bridges
math
,
matrices
3100
x65
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x131
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
2900
x128
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2900
x147
497E
Subsequences Return
dp
,
matrices
2900
x150
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2900
x152
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x198
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
2900
x217
453D
Little Pony and Elements of Harmony
dp
,
matrices
2900
x227
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x256
917C
Pollywog
combinatorics
,
dp
,
matrices
2800
x168
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x176
891E
Lust
combinatorics
,
math
,
matrices
2800
x221
575A
Fibonotci
data structures
,
math
,
matrices
2800
x268
351C
Jeff and Brackets
dp
,
matrices
2800
x360
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2800
x642
832E
Vasya and Shifts
matrices
2700
x163
736D
Permutations
math
,
matrices
2700
x246
385E
Bear in the Field
math
,
matrices
2700
x381
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2700
x599
86E
Long sequence
brute force
,
math
,
matrices
2600
x141
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2600
x179
593E
Strange Calculation and Cats
dp
,
matrices
2600
x269
498E
Stairs and Lines
dp
,
matrices
2600
x269
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x278
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2600
x353
576D
Flights for Regular Customers
dp
,
matrices
2600
x462
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2600
x592
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x788
1197F
Coloring Game
dp
,
games
,
matrices
2500
x115
60E
Mushroom Gnomes
math
,
matrices
2500
x213
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2500
x267
113D
Museum
math
,
matrices
,
probabilities
2500
x317
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2500
x362
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2500
x532
348D
Turtles
dp
,
matrices
2500
x545
514E
Darth Vader and Tree
dp
,
matrices
2500
x838
177G2
Fibonacci Strings
matrices
,
strings
2400
x80
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x206
93D
Flags
dp
,
math
,
matrices
2400
x249
107D
Crime Management
dp
,
graphs
,
matrices
2400
x269
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x327
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x385
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x486
1101G
(Zero XOR Subset)-less
math
,
matrices
2400
x598
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2400
x1287
267C
Berland Traffic
math
,
matrices
2300
x104
51E
Pentagon
combinatorics
,
graphs
,
matrices
2300
x219
147B
Smile House
binary search
,
graphs
,
matrices
2300
x463
954F
Runner's Problem
dp
,
matrices
,
sortings
2300
x528
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x1574
821E
Okabe and El Psy Kongroo
dp
,
matrices
2200
x969
1252K
Addition Robot
data structures
,
math
,
matrices
2200
x1018
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2200
x1333
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2200
x1374
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2200
x2314
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2100
x555
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1308
621E
Wet Shark and Blocks
dp
,
matrices
2100
x1554
852B
Neural Network country
dp
,
matrices
2000
x648
691E
Xor-sequences
matrices
2000
x996
222E
Decoding Genome
dp
,
matrices
2000
x1238
1117D
Magic Gems
dp
,
math
,
matrices
2000
x1934
582B
Once Again...
constructive algorithms
,
dp
,
matrices
2000
x2422
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x894
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x2269
225C
Barcode
dp
,
matrices
1800
x4522
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1700
x3315
166E
Tetrahedron
dp
,
math
,
matrices
1500
x8690
485A
Factory
implementation
,
math
,
matrices
1400
x5255
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x314
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