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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
44:15:16
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Difficulty:
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combinatorics
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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Status
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Custom test
Problems
#
Name
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x616
815B
Karen and Test
brute force
,
combinatorics
,
constructive algorithms
,
math
2200
x1382
814E
An unavoidable detour for home
combinatorics
,
dp
,
graphs
,
shortest paths
2600
x671
809C
Find a car
combinatorics
,
divide and conquer
,
dp
2600
x813
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x164
804B
Minimum number of steps
combinatorics
,
greedy
,
implementation
,
math
1400
x9691
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3350
794G
Replace All
combinatorics
,
dp
,
math
3400
x346
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2598
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x3006
776G
Sherlock and the Encrypted Data
bitmasks
,
combinatorics
,
dp
2900
x339
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x189
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x1032
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x380
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1337
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x180
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x1006
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x923
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x452
747F
Igor and Interesting Numbers
brute force
,
combinatorics
,
dp
,
math
2500
x422
735C
Tennis Championship
combinatorics
,
constructive algorithms
,
greedy
,
math
1600
x7545
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x404
722E
Research Rover
combinatorics
,
dp
2900
x876
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x369
715E
Complete the Permutations
combinatorics
,
fft
,
graphs
,
math
3400
x357
712D
Memory and Scores
combinatorics
,
dp
,
math
2200
x1847
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4499
698F
Coprime Permutation
combinatorics
,
number theory
3000
x438
696C
PLEASE
combinatorics
,
dp
,
implementation
,
math
,
matrices
2000
x2086
690D2
The Wall (medium)
combinatorics
1800
x1248
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1942
689C
Mike and Chocolate Thieves
binary search
,
combinatorics
,
math
1700
x5392
685A
Robbers' watch
brute force
,
combinatorics
,
dp
,
math
1700
x4243
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6441
666C
Codeword
combinatorics
,
strings
2500
x787
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1527
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x1208
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x557
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3254
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x797
630I
Parking Lot
combinatorics
,
math
1700
x6860
630H
Benches
combinatorics
,
math
1400
x5042
630G
Challenge Pennants
combinatorics
,
math
1600
x2801
630F
Selection of Personnel
combinatorics
,
math
1300
x6953
630C
Lucky Numbers
combinatorics
,
math
1100
x22319
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x1024
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13471
626D
Jerry's Protest
brute force
,
combinatorics
,
dp
,
probabilities
1800
x2766
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x550
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5582
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x11067
617B
Chocolate
combinatorics
1300
x18103
612E
Square Root of Permutation
combinatorics
,
constructive algorithms
,
dfs and similar
,
graphs
,
math
2200
x1718
610A
Pasha and Stick
combinatorics
,
math
1000
x23501
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6865
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2589
596C
Wilbur and Points
combinatorics
,
greedy
,
sortings
1700
x2258
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1114
584B
Kolya and Tanya
combinatorics
1500
x12048
577B
Modulo Sum
combinatorics
,
data structures
,
dp
,
two pointers
1900
x12339
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1692
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2330
570E
Pig and Palindromes
combinatorics
,
dp
2300
x1909
568B
Symmetric and Transitive
combinatorics
,
dp
,
math
1900
x2250
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x441
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6586
557D
Vitaly and Cycle
combinatorics
,
dfs and similar
,
graphs
,
math
2000
x2213
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2120
553A
Kyoya and Colored Balls
combinatorics
,
dp
,
math
1500
x8713
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4497
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1967
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2901
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x22650
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1882
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x374
518D
Ilya and Escalator
combinatorics
,
dp
,
math
,
probabilities
1700
x7053
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x760
501E
Misha and Palindrome Degree
binary search
,
combinatorics
,
implementation
2500
x918
500D
New Year Santa Network
combinatorics
,
dfs and similar
,
graphs
,
trees
1900
x3127
489F
Special Matrices
combinatorics
,
dp
2100
x1673
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6707
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x536
479E
Riding in a Lift
combinatorics
,
dp
1900
x5169
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x36888
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x31118
466D
Increase Sequence
combinatorics
,
dp
2100
x3233
459C
Pashmak and Buses
combinatorics
,
constructive algorithms
,
math
1900
x6193
459B
Pashmak and Flowers
combinatorics
,
implementation
,
sortings
1300
x40739
457D
Bingo!
combinatorics
,
math
,
probabilities
2700
x282
452C
Magic Trick
combinatorics
,
math
,
probabilities
2100
x1630
451E
Devu and Flowers
bitmasks
,
combinatorics
,
number theory
2300
x3669
449D
Jzzhu and Numbers
bitmasks
,
combinatorics
,
dp
2400
x4537
439E
Devu and Birthday Celebration
combinatorics
,
dp
,
math
2100
x1574
438E
The Child and Binary Tree
combinatorics
,
divide and conquer
,
fft
,
number theory
3100
x1894
431D
Random Task
binary search
,
bitmasks
,
combinatorics
,
dp
,
math
2100
x2323
414C
Mashmokh and Reverse Operation
combinatorics
,
divide and conquer
2100
x2225
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x22593
407C
Curious Array
brute force
,
combinatorics
,
implementation
,
math
2500
x1010
403D
Beautiful Pairs of Numbers
combinatorics
,
dp
2300
x1111
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x4197
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