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Before contest
Codeforces Round #717 (Div. 2)
22:44:37
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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
485A
Factory
implementation
,
math
,
matrices
1400
x6356
166E
Tetrahedron
dp
,
math
,
matrices
1500
x12779
1513C
Add One
dp
,
matrices
1600
x5825
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x3999
225C
Barcode
dp
,
matrices
1700
x6213
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x2845
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x2757
222E
Decoding Genome
dp
,
matrices
1900
x1520
691E
Xor-sequences
matrices
1900
x1465
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1058
621E
Wet Shark and Blocks
dp
,
matrices
2000
x1957
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x1672
852B
Neural Network country
dp
,
matrices
2000
x845
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x2770
1117D
Magic Gems
dp
,
math
,
matrices
2100
x2597
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1549
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1475
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1307
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1160
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x670
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1526
514E
Darth Vader and Tree
dp
,
matrices
2200
x997
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x3030
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x1877
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x1786
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x892
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x696
385E
Bear in the Field
math
,
matrices
2300
x455
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x958
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x813
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x644
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x630
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x514
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x505
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x398
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x340
593E
Strange Calculation and Cats
dp
,
matrices
2400
x315
107D
Crime Management
dp
,
graphs
,
matrices
2400
x310
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x267
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x252
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x812
348D
Turtles
dp
,
matrices
2500
x743
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x711
147B
Smile House
binary search
,
graphs
,
matrices
2500
x552
351C
Jeff and Brackets
dp
,
matrices
2500
x435
93D
Flags
dp
,
math
,
matrices
2500
x261
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x925
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x504
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x494
60E
Mushroom Gnomes
math
,
matrices
2600
x226
832E
Vasya and Shifts
matrices
2600
x192
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x131
177G2
Fibonacci Strings
matrices
,
strings
2600
x102
576D
Flights for Regular Customers
dp
,
matrices
2700
x774
1458C
Latin Square
math
,
matrices
2700
x640
575A
Fibonotci
data structures
,
math
,
matrices
2700
x451
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x420
113D
Museum
math
,
matrices
,
probabilities
2700
x402
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x353
498E
Stairs and Lines
dp
,
matrices
2700
x304
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x202
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x180
86E
Long sequence
brute force
,
math
,
matrices
2700
x148
1197F
Coloring Game
dp
,
games
,
matrices
2700
x146
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x138
267C
Berland Traffic
math
,
matrices
2700
x115
736D
Permutations
math
,
matrices
2800
x308
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x227
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x208
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x287
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x226
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x221
497E
Subsequences Return
dp
,
matrices
2900
x184
891E
Lust
combinatorics
,
math
,
matrices
3000
x409
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x357
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x295
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x201
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x79
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x286
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x252
446E
DZY Loves Bridges
math
,
matrices
3100
x78
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x21
578F
Mirror Box
matrices
,
trees
3200
x265
1344F
Piet's Palette
matrices
3200
x114
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x118
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x92
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x33
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x54
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