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Before contest
Codeforces Round #697 (Div. 3)
3 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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Custom test
Problems
#
Name
1474F
1 2 3 4 ...
dp
,
matrices
3000
x30
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x288
1458C
Latin Square
math
,
matrices
2700
x511
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x753
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x126
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x454
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x46
1344F
Piet's Palette
matrices
3200
x102
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1498
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x2711
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x266
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x30
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1276
1197F
Coloring Game
dp
,
games
,
matrices
2700
x145
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x21
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x2931
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x1690
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x176
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x188
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x665
1117D
Magic Gems
dp
,
math
,
matrices
2100
x2503
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x599
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x847
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x414
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1509
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x2744
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x173
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x902
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x659
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x220
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x339
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x427
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x217
891E
Lust
combinatorics
,
math
,
matrices
3000
x333
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x90
852B
Neural Network country
dp
,
matrices
2000
x756
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x483
832E
Vasya and Shifts
matrices
2600
x189
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1136
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x771
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x904
736D
Permutations
math
,
matrices
2800
x303
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x1821
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1036
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x681
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x1543
691E
Xor-sequences
matrices
1900
x1276
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x262
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x502
621E
Wet Shark and Blocks
dp
,
matrices
2000
x1914
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x109
593E
Strange Calculation and Cats
dp
,
matrices
2400
x312
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x2714
578F
Mirror Box
matrices
,
trees
3200
x250
576D
Flights for Regular Customers
dp
,
matrices
2700
x689
575A
Fibonotci
data structures
,
math
,
matrices
2700
x426
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1446
514E
Darth Vader and Tree
dp
,
matrices
2200
x967
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x336
498E
Stairs and Lines
dp
,
matrices
2700
x297
497E
Subsequences Return
dp
,
matrices
2900
x175
485A
Factory
implementation
,
math
,
matrices
1400
x6189
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x199
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x287
446E
DZY Loves Bridges
math
,
matrices
3100
x78
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x222
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x363
385E
Bear in the Field
math
,
matrices
2300
x440
351C
Jeff and Brackets
dp
,
matrices
2500
x423
348D
Turtles
dp
,
matrices
2500
x684
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x3886
267C
Berland Traffic
math
,
matrices
2700
x115
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x620
225C
Barcode
dp
,
matrices
1700
x5999
222E
Decoding Genome
dp
,
matrices
1900
x1463
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x224
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x374
177G2
Fibonacci Strings
matrices
,
strings
2600
x99
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x280
166E
Tetrahedron
dp
,
math
,
matrices
1500
x12173
147B
Smile House
binary search
,
graphs
,
matrices
2500
x540
113D
Museum
math
,
matrices
,
probabilities
2700
x382
107D
Crime Management
dp
,
graphs
,
matrices
2400
x309
93D
Flags
dp
,
math
,
matrices
2500
x260
86E
Long sequence
brute force
,
math
,
matrices
2700
x148
60E
Mushroom Gnomes
math
,
matrices
2600
x223
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x247
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