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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
29:53:10
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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
meet-in-the-middle
number theory
probabilities
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
122A
Lucky Division
brute force
,
number theory
1000
x114460
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x68694
630A
Again Twenty Five!
number theory
800
x60594
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56199
1475A
Odd Divisor
math
,
number theory
900
x53532
313A
Ilya and Bank Account
implementation
,
number theory
900
x52804
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x48094
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x45878
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42349
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x39275
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x37878
577A
Multiplication Table
implementation
,
number theory
1000
x37658
1325A
EhAb AnD gCd
constructive algorithms
,
greedy
,
number theory
800
x37650
1899A
Game with Integers
games
,
math
,
number theory
800
x35596
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x34929
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x31666
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31243
1549A
Gregor and Cryptography
math
,
number theory
800
x31023
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x30539
1360D
Buying Shovels
math
,
number theory
1300
x30281
1553A
Digits Sum
math
,
number theory
800
x29908
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29353
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29339
1326A
Bad Ugly Numbers
constructive algorithms
,
number theory
1000
x29196
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x28603
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x28351
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x28203
26A
Almost Prime
number theory
900
x27889
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x27741
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26559
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26344
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x26056
1455A
Strange Functions
math
,
number theory
800
x25921
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x25917
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x25911
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x25743
1312A
Two Regular Polygons
geometry
,
greedy
,
math
,
number theory
800
x25174
1324A
Yet Another Tetris Problem
implementation
,
number theory
900
x25124
1525A
Potion-making
math
,
number theory
800
x24965
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x24647
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24484
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24170
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24091
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x23959
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x23812
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23701
1370C
Number Game
games
,
math
,
number theory
1400
x23336
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23267
1238A
Prime Subtraction
math
,
number theory
900
x23067
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23049
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x22984
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x22979
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x22831
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22630
1108B
Divisors of Two Integers
brute force
,
greedy
,
math
,
number theory
1100
x22178
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22104
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x21961
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21789
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x21761
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x21655
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x21647
1872C
Non-coprime Split
math
,
number theory
1100
x21631
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21534
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x21241
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21158
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x21020
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x20576
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x20444
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x20286
1605A
A.M. Deviation
math
,
number theory
800
x20261
1350B
Orac and Models
dp
,
math
,
number theory
1400
x20236
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20212
1828B
Permutation Swap
math
,
number theory
900
x20000
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x19568
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x19468
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19428
1593D1
All are Same
math
,
number theory
1100
x19385
1487B
Cat Cycle
math
,
number theory
1200
x19357
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19257
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19098
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19047
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x18925
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x18448
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18295
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18276
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x18091
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x17668
762A
k-th divisor
math
,
number theory
1400
x17662
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x17444
1932B
Chaya Calendar
number theory
1100
x17427
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17410
1411B
Fair Numbers
brute force
,
number theory
1000
x17409
664A
Complicated GCD
math
,
number theory
800
x17089
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17037
1736B
Playing with GCD
math
,
number theory
1200
x17006
1332B
Composite Coloring
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1400
x16950
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16834
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x16749
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x16725
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x16684
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