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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
3 days
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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
1744A
Number Replacement
greedy
,
implementation
800
x26464
1948A
Special Characters
brute force
,
constructive algorithms
800
x26459
1487A
Arena
implementation
,
sortings
800
x26205
1743A
Password
brute force
,
combinatorics
,
implementation
,
math
800
x26185
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26157
978A
Remove Duplicates
implementation
800
x26141
1560C
Infinity Table
implementation
,
math
800
x26138
1391B
Fix You
brute force
,
greedy
,
implementation
800
x26116
1382A
Common Subsequence
brute force
800
x26094
1455A
Strange Functions
math
,
number theory
800
x26056
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x25999
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x25935
1814A
Coins
implementation
,
math
800
x25897
1701A
Grass Field
implementation
800
x25883
1856A
Tales of a Sort
implementation
800
x25850
1092B
Teams Forming
sortings
800
x25760
1478A
Nezzar and Colorful Balls
brute force
,
greedy
800
x25732
1509A
Average Height
constructive algorithms
800
x25729
1674A
Number Transformation
constructive algorithms
,
math
800
x25710
1674B
Dictionary
combinatorics
,
math
800
x25677
1901A
Line Trip
greedy
,
math
800
x25672
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25656
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25567
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x25513
1480A
Yet Another String Game
games
,
greedy
,
strings
800
x25454
1697A
Parkway Walk
greedy
,
implementation
800
x25438
1651A
Playoff
implementation
800
x25384
1312A
Two Regular Polygons
geometry
,
greedy
,
math
,
number theory
800
x25354
1569A
Balanced Substring
implementation
800
x25288
1562A
The Miracle and the Sleeper
greedy
,
math
800
x25208
1517A
Sum of 2050
greedy
,
math
800
x25130
1525A
Potion-making
math
,
number theory
800
x25087
1719A
Chip Game
games
,
math
800
x25045
1512B
Almost Rectangle
implementation
800
x25039
1304A
Two Rabbits
math
800
x25032
1945A
Setting up Camp
greedy
,
math
800
x24981
1832A
New Palindrome
strings
800
x24941
1705A
Mark the Photographer
greedy
,
sortings
800
x24845
1741B
Funny Permutation
constructive algorithms
,
math
800
x24841
1711A
Perfect Permutation
constructive algorithms
800
x24839
1690B
Array Decrements
greedy
,
implementation
800
x24819
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24757
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x24734
1481A
Space Navigation
greedy
,
strings
800
x24669
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24629
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x24607
1041A
Heist
greedy
,
implementation
,
sortings
800
x24574
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24562
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x24419
1747A
Two Groups
constructive algorithms
,
greedy
800
x24417
1831A
Twin Permutations
constructive algorithms
800
x24405
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24385
1882A
Increasing Sequence
greedy
800
x24342
1183A
Nearest Interesting Number
implementation
800
x24334
939A
Love Triangle
graphs
800
x24326
1917A
Least Product
constructive algorithms
,
math
800
x24283
1180A
Alex and a Rhombus
dp
,
implementation
,
math
800
x24282
1841A
Game with Board
constructive algorithms
,
games
800
x24265
1766A
Extremely Round
brute force
,
implementation
800
x24152
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24132
1398B
Substring Removal Game
games
,
greedy
,
sortings
800
x24114
1883A
Morning
math
800
x24095
1391A
Suborrays
constructive algorithms
,
math
800
x24018
1646A
Square Counting
math
800
x24008
988A
Diverse Team
brute force
,
implementation
800
x23952
1451A
Subtract or Divide
greedy
,
math
800
x23935
448A
Rewards
implementation
800
x23931
1497A
Meximization
brute force
,
data structures
,
greedy
,
sortings
800
x23921
1844A
Subtraction Game
constructive algorithms
,
games
800
x23910
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x23897
1594A
Consecutive Sum Riddle
math
800
x23894
1526A
Mean Inequality
constructive algorithms
,
sortings
800
x23885
1549B
Gregor and the Pawn Game
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
800
x23840
1345A
Puzzle Pieces
math
800
x23828
1539B
Love Song
dp
,
implementation
,
strings
800
x23826
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23824
1627A
Not Shading
constructive algorithms
,
implementation
800
x23819
1778A
Flip Flop Sum
greedy
,
implementation
800
x23796
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x23781
1712A
Wonderful Permutation
greedy
,
implementation
800
x23764
1657A
Integer Moves
brute force
,
math
800
x23718
1822A
TubeTube Feed
brute force
,
implementation
800
x23680
1968B
Prefiquence
greedy
,
two pointers
800
x23673
1699A
The Third Three Number Problem
constructive algorithms
,
math
800
x23673
1634A
Reverse and Concatenate
greedy
,
strings
800
x23659
1621A
Stable Arrangement of Rooks
constructive algorithms
800
x23570
1934A
Too Min Too Max
greedy
,
math
800
x23566
1206A
Choose Two Numbers
math
,
sortings
800
x23560
1748A
The Ultimate Square
math
800
x23550
1552A
Subsequence Permutation
sortings
,
strings
800
x23531
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23504
1895A
Treasure Chest
math
800
x23500
1102A
Integer Sequence Dividing
math
800
x23498
1809A
Garland
implementation
800
x23462
1923A
Moving Chips
greedy
,
implementation
800
x23376
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23269
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23223
1861A
Prime Deletion
constructive algorithms
,
math
800
x23168
378A
Playing with Dice
brute force
800
x23161
1516A
Tit for Tat
greedy
800
x23155
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