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Codeforces and Polygon may be unavailable from
May 23, 4:00 (UTC)
to
May 23, 8:00 (UTC)
due to technical maintenance.
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Codeforces Round (Div. 1 + Div. 2)
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combine-tags-by-or
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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
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geometry
graph matchings
graphs
greedy
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implementation
interactive
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Custom test
Problems
#
Name
625A
Guest From the Past
implementation
,
math
1700
x5356
624A
Save Luke
math
800
x10177
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x534
623D
Birthday
greedy
,
math
,
probabilities
2700
x467
622F
The Sum of the k-th Powers
math
2600
x3495
622A
Infinite Sequence
implementation
,
math
1000
x9116
621D
Rat Kwesh and Cheese
brute force
,
constructive algorithms
,
math
2400
x963
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5302
620A
Professor GukiZ's Robot
implementation
,
math
800
x12765
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x220
617A
Elephant
math
800
x171386
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x2711
615E
Hexagons
binary search
,
implementation
,
math
2100
x964
615D
Multipliers
math
,
number theory
2000
x3811
614B
Gena's Code
implementation
,
math
1400
x6776
613C
Necklace
constructive algorithms
,
math
2500
x973
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1586
612C
Replace To Make Regular Bracket Sequence
data structures
,
expression parsing
,
math
1400
x7694
612B
HDD is Outdated Technology
implementation
,
math
1200
x6837
610A
Pasha and Stick
combinatorics
,
math
1000
x22111
609C
Load Balancing
implementation
,
math
1500
x6336
608A
Saitama Destroys Hotel
implementation
,
math
1000
x9155
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1163
603D
Ruminations on Ruminants
geometry
,
math
2900
x337
603C
Lieges of Legendre
games
,
math
2200
x1808
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2538
603A
Alternative Thinking
dp
,
greedy
,
math
1600
x7551
601C
Kleofáš and the n-thlon
dp
,
math
,
probabilities
2300
x1290
601B
Lipshitz Sequence
data structures
,
math
2100
x2003
599D
Spongebob and Squares
brute force
,
math
1900
x2531
598A
Tricky Sum
math
900
x24979
597A
Divisibility
math
1600
x4415
596D
Wilbur and Trees
dp
,
math
,
probabilities
,
sortings
2300
x675
595B
Pasha and Phone
binary search
,
math
1600
x2895
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1179
593C
Beautiful Function
constructive algorithms
,
math
2200
x272
592C
The Big Race
math
1800
x3036
592B
The Monster and the Squirrel
math
1100
x8546
591A
Wizards' Duel
implementation
,
math
900
x13918
590B
Chip 'n Dale Rescue Rangers
binary search
,
geometry
,
math
2100
x1705
588B
Duff in Love
math
1300
x13858
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1044
584E
Anton and Ira
constructive algorithms
,
greedy
,
math
2300
x1398
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x8865
584A
Olesya and Rodion
math
1000
x43065
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x608
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3443
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7250
581B
Luxurious Houses
implementation
,
math
1100
x12907
581A
Vasya the Hipster
implementation
,
math
800
x67467
578A
A Problem about Polyline
geometry
,
math
1700
x4690
576A
Vasya and Petya's Game
math
,
number theory
1500
x13375
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1634
575A
Fibonotci
data structures
,
math
,
matrices
2700
x766
573B
Bear and Blocks
binary search
,
data structures
,
dp
,
math
1600
x5703
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16316
571E
Geometric Progressions
math
3200
x250
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2013
570B
Simple Game
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1300
x15791
569B
Inventory
greedy
,
math
1200
x6955
569A
Music
implementation
,
math
1500
x4743
568D
Sign Posts
brute force
,
geometry
,
math
2800
x298
568B
Symmetric and Transitive
combinatorics
,
dp
,
math
1900
x2219
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5002
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3529
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6166
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10297
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3937
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2141
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x3942
557B
Pasha and Tea
constructive algorithms
,
implementation
,
math
,
sortings
1500
x7084
557A
Ilya and Diplomas
greedy
,
implementation
,
math
1100
x8205
555D
Case of a Top Secret
binary search
,
implementation
,
math
2500
x857
554A
Kyoya and Photobooks
brute force
,
math
,
strings
900
x12742
553E
Kyoya and Train
dp
,
fft
,
graphs
,
math
,
probabilities
3200
x537
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2094
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8390
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4358
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5391
552B
Vanya and Books
implementation
,
math
1200
x15222
552A
Vanya and Table
implementation
,
math
1000
x9345
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1724
550E
Brackets in Implications
constructive algorithms
,
greedy
,
implementation
,
math
2200
x1377
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x27351
549H
Degenerate Matrix
binary search
,
math
2100
x1785
549E
Sasha Circle
geometry
,
math
2700
x145
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2713
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2314
546E
Soldier and Traveling
flows
,
graphs
,
math
2100
x3491
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x11286
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x168927
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x497
542C
Idempotent functions
constructive algorithms
,
graphs
,
math
2000
x1097
538G
Berserk Robot
constructive algorithms
,
math
,
sortings
3100
x443
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1499
538E
Demiurges Play Again
dfs and similar
,
dp
,
math
,
trees
2200
x1500
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5761
535E
Tavas and Pashmaks
geometry
,
math
2600
x798
535C
Tavas and Karafs
binary search
,
greedy
,
math
1900
x3706
534C
Polycarpus' Dice
math
1600
x4933
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