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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
41:22:25
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number theory
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
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number theory
probabilities
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Custom test
Problems
#
Name
630A
Again Twenty Five!
number theory
800
x60577
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56187
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x48087
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x45873
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42344
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x37876
1325A
EhAb AnD gCd
constructive algorithms
,
greedy
,
number theory
800
x37648
1899A
Game with Integers
games
,
math
,
number theory
800
x35562
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31233
1549A
Gregor and Cryptography
math
,
number theory
800
x31022
1553A
Digits Sum
math
,
number theory
800
x29907
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x28590
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x28339
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x27739
1455A
Strange Functions
math
,
number theory
800
x25921
1312A
Two Regular Polygons
geometry
,
greedy
,
math
,
number theory
800
x25173
1525A
Potion-making
math
,
number theory
800
x24926
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24484
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24167
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x23806
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23700
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x22829
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21158
1605A
A.M. Deviation
math
,
number theory
800
x20261
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19426
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19046
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x18447
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18276
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17407
664A
Complicated GCD
math
,
number theory
800
x17076
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17028
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16833
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x16428
1583A
Windblume Ode
math
,
number theory
800
x13505
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13198
1475A
Odd Divisor
math
,
number theory
900
x53523
313A
Ilya and Bank Account
implementation
,
number theory
900
x52799
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29351
26A
Almost Prime
number theory
900
x27878
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x25913
1324A
Yet Another Tetris Problem
implementation
,
number theory
900
x25123
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x24646
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24085
1238A
Prime Subtraction
math
,
number theory
900
x23065
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x22975
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22102
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21531
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x21231
1828B
Permutation Swap
math
,
number theory
900
x19995
1945B
Fireworks
math
,
number theory
900
x16588
1609A
Divide and Multiply
greedy
,
implementation
,
math
,
number theory
900
x16555
1764B
Doremy's Perfect Math Class
math
,
number theory
900
x14813
84A
Toy Army
math
,
number theory
900
x14430
267A
Subtractions
math
,
number theory
900
x7020
122A
Lucky Division
brute force
,
number theory
1000
x114444
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x39266
577A
Multiplication Table
implementation
,
number theory
1000
x37655
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x34927
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x30534
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29337
1326A
Bad Ugly Numbers
constructive algorithms
,
number theory
1000
x29195
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x25906
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x23948
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23045
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x21646
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x20439
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19098
1411B
Fair Numbers
brute force
,
number theory
1000
x17403
1051B
Relatively Prime Pairs
greedy
,
math
,
number theory
1000
x16379
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x14810
1107B
Digital root
math
,
number theory
1000
x14705
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14293
1245A
Good ol' Numbers Coloring
math
,
number theory
1000
x13846
1765M
Minimum LCM
math
,
number theory
1000
x11997
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x7670
177B1
Rectangular Game
number theory
1000
x3955
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26340
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x22983
1108B
Divisors of Two Integers
brute force
,
greedy
,
math
,
number theory
1100
x22177
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x21932
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21789
1872C
Non-coprime Split
math
,
number theory
1100
x21628
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x21016
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20206
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x19457
1593D1
All are Same
math
,
number theory
1100
x19384
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x17438
1932B
Chaya Calendar
number theory
1100
x17413
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x16224
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16061
1826B
Lunatic Never Content
math
,
number theory
1100
x15301
797A
k-Factorization
implementation
,
math
,
number theory
1100
x13697
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x12585
633A
Ebony and Ivory
brute force
,
math
,
number theory
1100
x12068
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11090
946B
Weird Subtraction Process
math
,
number theory
1100
x10634
630J
Divisibility
math
,
number theory
1100
x10581
758B
Blown Garland
brute force
,
implementation
,
number theory
1100
x9997
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9196
1033B
Square Difference
math
,
number theory
1100
x9089
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