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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
5 days
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→ Filter Problems
Difficulty:
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dfs and similar
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
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x10864
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12070
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12110
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x12983
1263D
Secret Passwords
dfs and similar
,
dsu
,
graphs
1500
x13320
510B
Fox And Two Dots
dfs and similar
1500
x13440
1487C
Minimum Ties
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
1500
x13719
687A
NP-Hard Problem
dfs and similar
,
graphs
1500
x13794
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x13964
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x14662
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15704
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x15953
1352F
Binary String Reconstruction
constructive algorithms
,
dfs and similar
,
math
1500
x16314
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x19336
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x39958
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3786
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4303
60B
Serial Time!
dfs and similar
,
dsu
1400
x4449
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4470
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4956
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5559
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8252
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8337
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9008
1761C
Set Construction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1400
x9194
1670C
Where is the Pizza?
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1400
x9534
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9598
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x11331
1143C
Queen
dfs and similar
,
trees
1400
x11448
505B
Mr. Kitayuta's Colorful Graph
dfs and similar
,
dp
,
dsu
,
graphs
1400
x12112
445B
DZY Loves Chemistry
dfs and similar
,
dsu
,
greedy
1400
x12138
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12518
1517C
Fillomino 2
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
1400
x13077
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x14076
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17095
1167C
News Distribution
dfs and similar
,
dsu
,
graphs
1400
x17123
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x17653
277A
Learning Languages
dfs and similar
,
dsu
1400
x18152
520B
Two Buttons
dfs and similar
,
graphs
,
greedy
,
implementation
,
math
,
shortest paths
1400
x48143
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2815
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4893
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5158
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x7801
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8816
429A
Xor-tree
dfs and similar
,
trees
1300
x10014
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x10502
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x10997
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11715
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x11861
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x14287
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14533
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x14607
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x16061
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16266
1249B2
Books Exchange (hard version)
dfs and similar
,
dsu
,
math
1300
x16267
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17038
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x21753
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10492
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11724
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15740
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x16748
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x17095
1669G
Fall Down
dfs and similar
,
implementation
1200
x17414
1311B
WeirdSort
dfs and similar
,
sortings
1200
x18505
1490D
Permutation Transformation
dfs and similar
,
divide and conquer
,
implementation
1200
x18859
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20450
1433D
Districts Connection
constructive algorithms
,
dfs and similar
1200
x21836
445A
DZY Loves Chessboard
dfs and similar
,
implementation
1200
x28316
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x46749
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x847
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x13912
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18329
1324C
Frog Jumps
binary search
,
data structures
,
dfs and similar
,
greedy
,
implementation
1100
x26952
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x12992
727A
Transformation: from A to B
brute force
,
dfs and similar
,
math
1000
x13240
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x20250
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24360
500A
New Year Transportation
dfs and similar
,
graphs
,
implementation
1000
x50418
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x5777
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13403
1593B
Make it Divisible by 25
dfs and similar
,
dp
,
greedy
,
math
,
math
900
x25325
115A
Party
dfs and similar
,
graphs
,
trees
900
x32917
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x11406
1598A
Computer Game
brute force
,
dfs and similar
,
dp
,
implementation
800
x22813
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23837
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