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Codeforces and Polygon may be unavailable from
May 23, 4:00 (UTC)
to
May 23, 7:00 (UTC)
due to technical maintenance.
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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
3 days
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→ Filter Problems
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implementation
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
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Status
Standings
Custom test
Problems
#
Name
1923A
Moving Chips
greedy
,
implementation
800
x23376
1809A
Garland
implementation
800
x23462
1822A
TubeTube Feed
brute force
,
implementation
800
x23680
1712A
Wonderful Permutation
greedy
,
implementation
800
x23764
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23784
1778A
Flip Flop Sum
greedy
,
implementation
800
x23796
1627A
Not Shading
constructive algorithms
,
implementation
800
x23819
1539B
Love Song
dp
,
implementation
,
strings
800
x23827
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23841
448A
Rewards
implementation
800
x23931
988A
Diverse Team
brute force
,
implementation
800
x23953
1766A
Extremely Round
brute force
,
implementation
800
x24154
1180A
Alex and a Rhombus
dp
,
implementation
,
math
800
x24284
1183A
Nearest Interesting Number
implementation
800
x24335
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24385
1041A
Heist
greedy
,
implementation
,
sortings
800
x24574
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24631
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24758
1690B
Array Decrements
greedy
,
implementation
800
x24819
1512B
Almost Rectangle
implementation
800
x25039
1569A
Balanced Substring
implementation
800
x25288
1651A
Playoff
implementation
800
x25384
1697A
Parkway Walk
greedy
,
implementation
800
x25438
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x25513
1856A
Tales of a Sort
implementation
800
x25851
1701A
Grass Field
implementation
800
x25883
1814A
Coins
implementation
,
math
800
x25902
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25936
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26000
1391B
Fix You
brute force
,
greedy
,
implementation
800
x26117
1560C
Infinity Table
implementation
,
math
800
x26138
978A
Remove Duplicates
implementation
800
x26143
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26158
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x26186
1487A
Arena
implementation
,
sortings
800
x26209
1744A
Number Replacement
greedy
,
implementation
800
x26465
1003A
Polycarp's Pockets
implementation
800
x26493
1462B
Last Year's Substring
dp
,
implementation
,
strings
800
x26621
1721A
Image
greedy
,
implementation
800
x26645
1644A
Doors and Keys
implementation
800
x26921
119A
Epic Game
implementation
800
x26942
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x27016
1849A
Morning Sandwich
implementation
,
math
800
x27114
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27238
330A
Cakeminator
brute force
,
implementation
800
x27517
1454B
Unique Bid Auction
implementation
800
x27617
255A
Greg's Workout
implementation
800
x27764
1788A
One and Two
brute force
,
implementation
,
math
800
x27814
599A
Patrick and Shopping
implementation
800
x27906
1433B
Yet Another Bookshelf
greedy
,
implementation
800
x28009
1971B
Different String
implementation
,
strings
800
x28109
1772B
Matrix Rotation
brute force
,
implementation
800
x28238
34A
Reconnaissance 2
implementation
800
x28574
734B
Anton and Digits
brute force
,
greedy
,
implementation
,
math
800
x28577
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28857
711A
Bus to Udayland
brute force
,
implementation
800
x28858
1759A
Yes-Yes?
implementation
,
strings
800
x28878
1220A
Cards
implementation
,
sortings
,
strings
800
x28900
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x28926
1632A
ABC
implementation
800
x28954
1541A
Pretty Permutations
constructive algorithms
,
greedy
,
implementation
800
x29018
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29097
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29287
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29430
1095A
Repeating Cipher
implementation
800
x29563
1722C
Word Game
data structures
,
implementation
800
x29621
1567A
Domino Disaster
implementation
,
strings
800
x29681
1914A
Problemsolving Log
implementation
,
strings
800
x29911
1547A
Shortest Path with Obstacle
implementation
,
math
800
x29931
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x29937
1926B
Vlad and Shapes
geometry
,
implementation
800
x30038
1800A
Is It a Cat?
implementation
,
strings
800
x30085
1619B
Squares and Cubes
implementation
,
math
800
x30115
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30178
1303A
Erasing Zeroes
implementation
,
strings
800
x30659
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x30976
1846A
Rudolph and Cut the Rope
implementation
,
math
800
x31463
1372A
Omkar and Completion
constructive algorithms
,
implementation
800
x31494
540A
Combination Lock
implementation
800
x31645
1833A
Musical Puzzle
implementation
,
strings
800
x31671
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31777
1921B
Arranging Cats
greedy
,
implementation
800
x32124
1692C
Where's the Bishop?
implementation
800
x32624
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32736
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x32852
1473A
Replacing Elements
greedy
,
implementation
,
math
,
sortings
800
x32912
1669C
Odd/Even Increments
greedy
,
greedy
,
implementation
,
math
800
x33039
1971A
My First Sorting Problem
implementation
,
sortings
800
x33832
1950B
Upscaling
implementation
800
x33915
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x33966
1703C
Cypher
brute force
,
implementation
,
strings
800
x34302
1907A
Rook
implementation
800
x34315
265A
Colorful Stones (Simplified Edition)
implementation
800
x34609
1325B
CopyCopyCopyCopyCopy
greedy
,
implementation
800
x34968
1760C
Advantage
data structures
,
implementation
,
sortings
800
x35208
1950C
Clock Conversion
implementation
,
math
800
x35477
1873C
Target Practice
implementation
,
math
800
x35697
686A
Free Ice Cream
constructive algorithms
,
implementation
800
x35720
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35746
1607A
Linear Keyboard
implementation
,
strings
800
x36172
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