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Before contest
Codeforces Round 876 (Div. 2)
13:30:11
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Difficulty:
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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
#
Name
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x17691
166E
Tetrahedron
dp
,
math
,
matrices
1500
x17646
1513C
Add One
dp
,
matrices
1600
x11491
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x10410
225C
Barcode
dp
,
matrices
1700
x8002
485A
Factory
implementation
,
math
,
matrices
1400
x7706
1557C
Moamen and XOR
bitmasks
,
combinatorics
,
dp
,
math
,
matrices
1700
x7676
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5306
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4593
1188B
Count Pairs
math
,
matrices
,
number theory
,
two pointers
2300
x3798
1117D
Magic Gems
dp
,
math
,
matrices
2100
x3489
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3419
1332E
Height All the Same
combinatorics
,
constructive algorithms
,
math
,
matrices
2100
x3268
582B
Once Again...
constructive algorithms
,
dp
,
matrices
1900
x3157
718C
Sasha and Array
data structures
,
math
,
matrices
2300
x2748
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2572
621E
Wet Shark and Blocks
dp
,
matrices
2000
x2441
1182E
Product Oriented Recurrence
dp
,
math
,
matrices
,
number theory
2300
x2284
222E
Decoding Genome
dp
,
matrices
1900
x2098
691E
Xor-sequences
matrices
1900
x2080
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x1953
1335F
Robots on a Grid
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
2200
x1845
1023E
Down or Right
constructive algorithms
,
interactive
,
matrices
2100
x1845
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1624
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1617
1252K
Addition Robot
data structures
,
math
,
matrices
2100
x1611
959F
Mahmoud and Ehab and yet another xor task
bitmasks
,
dp
,
math
,
matrices
2400
x1551
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1420
1101G
(Zero XOR Subset)-less
math
,
matrices
2300
x1394
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1344
750E
New Year and Old Subsequence
data structures
,
divide and conquer
,
dp
,
matrices
2600
x1328
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1311
348D
Turtles
dp
,
matrices
2500
x1291
717D
Dexterina’s Lab
games
,
matrices
,
probabilities
1900
x1268
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1228
514E
Darth Vader and Tree
dp
,
matrices
2200
x1218
852B
Neural Network country
dp
,
matrices
2000
x1179
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1153
576D
Flights for Regular Customers
dp
,
matrices
2700
x1094
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1054
1458C
Latin Square
math
,
matrices
2700
x1048
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x996
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x942
1814E
Chain Chips
data structures
,
dp
,
matrices
2300
x893
954F
Runner's Problem
dp
,
matrices
,
sortings
2100
x887
1106F
Lunar New Year and a Recursive Sequence
math
,
matrices
,
number theory
2400
x831
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x805
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x803
1701F
Points
combinatorics
,
data structures
,
implementation
,
math
,
matrices
2500
x762
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x737
891E
Lust
combinatorics
,
math
,
matrices
3000
x730
147B
Smile House
binary search
,
graphs
,
matrices
2500
x680
837F
Prefix Sums
binary search
,
brute force
,
combinatorics
,
math
,
matrices
2400
x665
1380F
Strange Addition
data structures
,
dp
,
matrices
2600
x662
575A
Fibonotci
data structures
,
math
,
matrices
2700
x596
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x579
1681E
Labyrinth Adventures
data structures
,
dp
,
matrices
,
shortest paths
2600
x571
113D
Museum
math
,
matrices
,
probabilities
2700
x564
385E
Bear in the Field
math
,
matrices
2300
x528
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x514
351C
Jeff and Brackets
dp
,
matrices
2500
x509
1411G
No Game No Life
bitmasks
,
games
,
math
,
matrices
2700
x505
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x500
1025E
Colored Cubes
constructive algorithms
,
implementation
,
matrices
2700
x497
946F
Fibonacci String Subsequences
combinatorics
,
dp
,
matrices
2400
x481
1286D
LCC
data structures
,
math
,
matrices
,
probabilities
3100
x475
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x466
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x459
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x456
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x436
453D
Little Pony and Elements of Harmony
dp
,
matrices
3000
x418
578F
Mirror Box
matrices
,
trees
3200
x401
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x394
736D
Permutations
math
,
matrices
2800
x392
923E
Perpetual Subtraction
fft
,
math
,
matrices
3100
x387
498E
Stairs and Lines
dp
,
matrices
2700
x380
593E
Strange Calculation and Cats
dp
,
matrices
2400
x371
107D
Crime Management
dp
,
graphs
,
matrices
2400
x371
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x354
51E
Pentagon
combinatorics
,
graphs
,
matrices
2400
x326
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x323
917C
Pollywog
combinatorics
,
dp
,
matrices
2900
x311
93D
Flags
dp
,
math
,
matrices
2500
x302
446D
DZY Loves Games
math
,
matrices
,
probabilities
2800
x299
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x293
60E
Mushroom Gnomes
math
,
matrices
2600
x282
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x252
832E
Vasya and Shifts
matrices
2600
x250
497E
Subsequences Return
dp
,
matrices
2900
x249
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x239
1672G
Cross Xor
constructive algorithms
,
graphs
,
math
,
matrices
3200
x234
1662C
European Trip
dp
,
graphs
,
math
,
matrices
x221
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x217
1197F
Coloring Game
dp
,
games
,
matrices
2700
x204
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x198
1344F
Piet's Palette
matrices
3200
x191
1402C
Star Trek
*special problem
,
combinatorics
,
dfs and similar
,
dp
,
games
,
graphs
,
matrices
,
trees
2600
x181
1474F
1 2 3 4 ...
dp
,
math
,
matrices
3000
x168
86E
Long sequence
brute force
,
math
,
matrices
2700
x163
267C
Berland Traffic
math
,
matrices
2700
x139
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