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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
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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
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
2038K
Grid Walk
brute force
,
dp
,
greedy
,
math
,
number theory
2100
x719
2037G
Natlan Exploring
bitmasks
,
combinatorics
,
data structures
,
dp
,
math
,
number theory
2000
x1704
2037C
Superultra's Favorite Permutation
constructive algorithms
,
greedy
,
math
,
number theory
1000
x14045
2036G
Library of Magic
binary search
,
constructive algorithms
,
divide and conquer
,
interactive
,
math
,
number theory
2200
x1045
2036F
XORificator 3000
bitmasks
,
dp
,
number theory
,
two pointers
1900
x3239
2035B
Everyone Loves Tres
constructive algorithms
,
greedy
,
math
,
number theory
900
x14432
2033F
Kosuke's Sloth
brute force
,
math
,
number theory
1800
x5171
2032A
Circuit
greedy
,
implementation
,
math
,
number theory
800
x20017
2031C
Penchick and BBQ Buns
constructive algorithms
,
math
,
number theory
1300
x8742
2029E
Common Generator
brute force
,
constructive algorithms
,
math
,
number theory
2100
x2332
2021B
Maximize Mex
brute force
,
greedy
,
math
,
number theory
1200
x14234
2020F
Count Leaves
dp
,
math
,
number theory
2900
x194
2020A
Find Minimum Operations
bitmasks
,
brute force
,
greedy
,
math
,
number theory
800
x21801
2013E
Prefix GCD
brute force
,
dp
,
greedy
,
math
,
number theory
2200
x3184
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2903
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x5142
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x12483
2007C
Dora and C++
math
,
number theory
1500
x12208
2007A
Dora's Set
greedy
,
math
,
number theory
800
x22609
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1637
2005D
Alter the GCD
binary search
,
brute force
,
data structures
,
divide and conquer
,
implementation
,
number theory
2400
x873
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x4050
2002F2
Court Blue (Hard Version)
brute force
,
dp
,
math
,
number theory
2800
x432
2002F1
Court Blue (Easy Version)
brute force
,
dfs and similar
,
dp
,
math
,
number theory
2600
x817
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x23783
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x15982
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x8584
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x706
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
1900
x5770
1993F2
Dyn-scripted Robot (Hard Version)
chinese remainder theorem
,
math
,
number theory
2800
x417
1993F1
Dyn-scripted Robot (Easy Version)
brute force
,
chinese remainder theorem
,
constructive algorithms
,
math
,
number theory
2400
x1000
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5765
1991H
Prime Split Game
bitmasks
,
dp
,
fft
,
games
,
math
,
number theory
3300
x504
1991D
Prime XOR Coloring
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
1900
x6670
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x1091
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x1498
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x8858
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x9443
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
800
x46471
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x7178
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x16988
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1679
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x14344
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x18824
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1348
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6785
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x231
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x25143
1968A
Maximize?
brute force
,
math
,
number theory
800
x34718
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3953
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x13356
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6769
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1280
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4579
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2322
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x19532
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x14540
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x23318
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2580
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x678
1945B
Fireworks
math
,
number theory
900
x22834
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x241
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x20451
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22772
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x33075
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x1095
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x8320
1932B
Chaya Calendar
number theory
1100
x20961
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2877
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x19277
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1742
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8679
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x12083
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x20276
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x13894
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1809
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x149
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x26191
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x26156
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1413
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x4495
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x17454
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x10491
1906G
Grid Game 2
games
,
number theory
2900
x211
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x13982
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x4319
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x13684
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x21122
1899A
Game with Integers
games
,
math
,
number theory
800
x48052
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x105
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x90
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x3290
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x1037
1881D
Divide and Equalize
math
,
number theory
1300
x17758
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x516
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x4169
1877C
Joyboard
math
,
number theory
1200
x11161
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x8443
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11896
1872C
Non-coprime Split
math
,
number theory
1100
x23658
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