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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
18:15:44
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Difficulty:
—
math
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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Status
Standings
Custom test
Problems
#
Name
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x17413
1842A
Tenzing and Tsondu
games
,
math
800
x19889
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x2045
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7924
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x995
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2415
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x28583
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x22607
1839A
The Good Array
greedy
,
implementation
,
math
800
x17545
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1505
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x14708
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x16530
1838A
Blackboard List
constructive algorithms
,
math
800
x21621
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x33449
1836B
Astrophysicists
greedy
,
math
1100
x12713
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x511
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x1010
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x954
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7909
1834F
Typewriter
brute force
,
math
2500
x532
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2300
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x13455
1834B
Maximum Strength
greedy
,
math
1000
x15390
1834A
Unit Array
greedy
,
math
800
x25288
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x7526
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x26244
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1928
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2973
1830E
Bully Sort
data structures
,
math
3500
x253
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1719
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4968
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7904
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x10667
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x17962
1828B
Permutation Swap
math
,
number theory
900
x23798
1828A
Divisible Array
constructive algorithms
,
math
800
x23798
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x19409
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x386
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13753
1826B
Lunatic Never Content
math
,
number theory
1100
x18131
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14789
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2729
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4693
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x900
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1267
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3878
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x12426
1823B
Sort with Step
brute force
,
math
,
sortings
900
x16147
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x16226
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2465
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x7163
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x10608
1822D
Super-Permutation
constructive algorithms
,
math
1200
x16935
1822C
Bun Lover
math
800
x23164
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24931
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x764
1821D
Black Cells
binary search
,
brute force
,
greedy
,
math
1900
x5031
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x14470
1821A
Matching
combinatorics
,
math
800
x19972
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x15065
1819E
Roads in E City
interactive
,
math
,
probabilities
,
trees
3200
x302
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1500
1817C
Similar Polynomials
combinatorics
,
math
2400
x1014
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x241
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x349
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1193
1815A
Ian and Array Sorting
greedy
,
math
1300
x14286
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x883
1814B
Long Legs
brute force
,
math
1700
x10154
1814A
Coins
implementation
,
math
800
x29868
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x4026
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4672
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1793
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x2103
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x12518
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7604
1811B
Conveyor Belts
implementation
,
math
1000
x20526
1811A
Insert Digit
greedy
,
math
,
strings
800
x31324
1810H
Last Number
combinatorics
,
math
2900
x141
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x580
1810D
Climbing the Tree
binary search
,
math
1700
x7513
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17638
1809G
Prediction
combinatorics
,
dp
,
math
2800
x450
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x867
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12972
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x20118
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x448
1808B
Playing in a Casino
math
,
sortings
1200
x17463
1806F2
GCD Master (hard version)
greedy
,
math
,
sortings
2900
x300
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x360
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x941
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7701
1806A
Walking Master
geometry
,
greedy
,
math
800
x25627
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x355
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x929
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x12693
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x12280
1804A
Lame King
greedy
,
math
800
x18013
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x13429
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x602
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