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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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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
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
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1049
1924B
Space Harbour
data structures
,
implementation
,
math
,
sortings
2100
x2295
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12456
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x333
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x3228
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5971
1923C
Find B
constructive algorithms
,
greedy
1400
x13299
1923B
Monsters Attack!
dp
,
greedy
,
implementation
1100
x16292
1923A
Moving Chips
greedy
,
implementation
800
x23364
1922F
Replace on Segment
dp
,
graph matchings
2500
x1173
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7087
1922D
Berserk Monsters
brute force
,
data structures
,
dsu
,
implementation
,
math
1900
x5251
1922C
Closest Cities
greedy
,
implementation
,
math
1300
x16973
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x19130
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25931
1921G
Mischievous Shooter
brute force
,
data structures
,
divide and conquer
,
dp
,
implementation
2200
x1134
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3474
1921E
Eat the Chip
brute force
,
games
,
greedy
,
math
1600
x8969
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20094
1921C
Sending Messages
greedy
,
math
900
x27455
1921B
Arranging Cats
greedy
,
implementation
800
x32107
1921A
Square
greedy
,
math
800
x40170
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x408
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x885
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2382
1920D
Array Repetition
binary search
,
brute force
,
dsu
,
implementation
,
math
1900
x5134
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11917
1920B
Summation Game
games
,
greedy
,
math
,
sortings
1100
x19387
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26585
1919H
Tree Diameter
interactive
,
trees
2000
x130
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x170
1919F2
Wine Factory (Hard Version)
data structures
,
dp
,
flows
,
greedy
,
matrices
2800
x743
1919F1
Wine Factory (Easy Version)
data structures
,
greedy
2300
x2034
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x778
1919D
01 Tree
constructive algorithms
,
data structures
,
dsu
,
greedy
,
sortings
,
trees
2100
x3612
1919C
Grouping Increases
data structures
,
dp
,
greedy
1400
x16936
1919B
Plus-Minus Split
greedy
800
x28874
1919A
Wallet Exchange
games
,
math
800
x31840
1918G
Permutation of Given
constructive algorithms
,
math
2700
x428
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x780
1918E
ace5 and Task Order
constructive algorithms
,
divide and conquer
,
implementation
,
interactive
,
probabilities
,
sortings
2200
x1568
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4303
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12655
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22235
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28848
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x901
1917E
Construct Matrix
constructive algorithms
,
math
2500
x1274
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1667
1917C
Watering an Array
brute force
,
greedy
,
implementation
,
math
1600
x9452
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19566
1917A
Least Product
constructive algorithms
,
math
800
x24278
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x502
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x584
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x410
1916E
Happy Life in University
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2104
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7925
1916C
Training Before the Olympiad
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1200
x16775
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23793
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24623
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5470
1915F
Greetings
data structures
,
divide and conquer
,
sortings
1500
x11725
1915E
Romantic Glasses
data structures
,
greedy
,
math
1300
x18681
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x27899
1915C
Can I Square?
binary search
,
implementation
800
x37892
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38819
1915A
Odd One Out
bitmasks
,
implementation
800
x50256
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1229
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1684
1914F
Programming Competition
dfs and similar
,
dp
,
graph matchings
,
greedy
,
trees
1900
x3704
1914E2
Game with Marbles (Hard Version)
games
,
greedy
,
sortings
1400
x11318
1914E1
Game with Marbles (Easy Version)
brute force
,
games
,
greedy
,
sortings
1400
x11216
1914D
Three Activities
brute force
,
dp
,
greedy
,
implementation
,
sortings
1200
x18394
1914C
Quests
greedy
,
math
1100
x20950
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x28688
1914A
Problemsolving Log
implementation
,
strings
800
x29902
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x290
1913E
Matrix Problem
flows
,
graphs
2400
x911
1913D
Array Collapse
data structures
,
divide and conquer
,
dp
,
trees
2100
x2733
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13768
1913B
Swap and Delete
strings
1000
x22142
1913A
Rating Increase
implementation
800
x22367
1912L
LOL Lovers
strings
800
x6370
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2066
1912J
Joy of Pokémon Observation
2300
x525
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x54
1912H
Hypercatapult Commute
graphs
2400
x377
1912G
Great City Saint Petersburg
data structures
2400
x420
1912F
Fugitive Frenzy
math
,
probabilities
3100
x105
1912E
Evaluate It and Back Again
constructive algorithms
,
implementation
,
math
2200
x781
1912D
Divisibility Test
math
1900
x1332
1912C
Cactus Transformation
constructive algorithms
3300
x45
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x936
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1894
1910J
Two Colors
*special problem
2900
x43
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x42
1910H
Sum of Digits of Sums
*special problem
,
binary search
,
data structures
2400
x80
1910G
Pool Records
*special problem
,
greedy
2700
x51
1910F
Build Railway Stations
*special problem
,
greedy
,
trees
2000
x163
1910E
Maximum Sum Subarrays
*special problem
,
dp
2100
x175
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