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→ Pay attention
Before contest
Educational Codeforces Round 129 (Rated for Div. 2)
14:48:29
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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
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x149
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x149
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x8274
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x4319
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x432
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1393
1599E
Two Arrays
data structures
,
matrices
3200
x35
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x6839
1540E
Tasty Dishes
math
,
matrices
3500
x51
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2312
1513C
Add One
dp
,
matrices
1600
x9626
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x260
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x127
1458C
Latin Square
math
,
matrices
2700
x873
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1013
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x436
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x160
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x575
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x61
1344F
Piet's Palette
matrices
3200
x154
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1709
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3066
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x400
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x59
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1454
1197F
Coloring Game
dp
,
games
,
matrices
2700
x178
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x3463
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x37
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2042
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x261
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x259
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x827
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3038
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x752
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1173
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x466
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1688
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3200
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x206
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1249
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x786
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x411
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x305
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x659
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x277
891E
Lust
combinatorics
,
math
,
matrices
3000
x581
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x109
852B
Neural Network country
dp
,
matrices
2000
x1026
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x574
832E
Vasya and Shifts
matrices
2600
x204
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1240
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x902
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1063
736D
Permutations
math
,
matrices
2800
x361
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x2252
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1196
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x900
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x1861
691E
Xor-sequences
matrices
1900
x1801
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x306
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x667
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2172
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x157
593E
Strange Calculation and Cats
dp
,
matrices
2400
x331
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x2931
578F
Mirror Box
matrices
,
trees
3200
x342
576D
Flights for Regular Customers
dp
,
matrices
2700
x955
575A
Fibonotci
data structures
,
math
,
matrices
2700
x528
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1551
514E
Darth Vader and Tree
dp
,
matrices
2200
x1112
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x472
498E
Stairs and Lines
dp
,
matrices
2700
x359
497E
Subsequences Return
dp
,
matrices
2900
x224
485A
Factory
implementation
,
math
,
matrices
1400
x7178
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x219
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x367
446E
DZY Loves Bridges
math
,
matrices
3100
x94
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x268
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x457
385E
Bear in the Field
math
,
matrices
2300
x492
351C
Jeff and Brackets
dp
,
matrices
2500
x478
348D
Turtles
dp
,
matrices
2500
x1021
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4319
267C
Berland Traffic
math
,
matrices
2700
x119
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x684
225C
Barcode
dp
,
matrices
1700
x7145
222E
Decoding Genome
dp
,
matrices
1900
x1769
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x267
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x440
177G2
Fibonacci Strings
matrices
,
strings
2600
x118
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x381
166E
Tetrahedron
dp
,
math
,
matrices
1500
x15545
147B
Smile House
binary search
,
graphs
,
matrices
2500
x620
113D
Museum
math
,
matrices
,
probabilities
2700
x473
107D
Crime Management
dp
,
graphs
,
matrices
2400
x333
93D
Flags
dp
,
math
,
matrices
2500
x278
86E
Long sequence
brute force
,
math
,
matrices
2700
x154
60E
Mushroom Gnomes
math
,
matrices
2600
x261
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x277
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