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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
43:23:43
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Difficulty:
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constructive algorithms
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
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Custom test
Problems
#
Name
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x7523
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x13463
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1923
1831B
Array merging
constructive algorithms
,
greedy
1000
x21424
1831A
Twin Permutations
constructive algorithms
800
x27688
1828A
Divisible Array
constructive algorithms
,
math
800
x23793
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x118
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x421
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3876
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x16222
1822D
Super-Permutation
constructive algorithms
,
math
1200
x16934
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1500
1818B
Indivisible
constructive algorithms
900
x15134
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x789
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x4186
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x15389
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x17677
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x241
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x2004
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x3085
1814C
Search in Parallel
constructive algorithms
,
greedy
,
sortings
1500
x10970
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5969
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
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7602
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x20092
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17636
1809D
Binary String Sorting
constructive algorithms
,
greedy
1800
x6397
1809C
Sum on Subarrays
constructive algorithms
,
greedy
,
math
1500
x12969
1806C
Sequence Master
brute force
,
constructive algorithms
,
math
1600
x7699
1806B
Mex Master
constructive algorithms
,
greedy
900
x17914
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8672
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x13015
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12998
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1222
1799B
Equalize by Divide
brute force
,
constructive algorithms
,
greedy
,
math
1200
x11452
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x10191
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7767
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x16354
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17593
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1130
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x23159
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x21007
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15924
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1136
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x15331
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1699
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x871
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x17458
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x20202
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x690
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2374
1787A
Exponential Equation
constructive algorithms
,
math
800
x19285
1784B
Letter Exchange
constructive algorithms
1900
x3359
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x17860
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x30939
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x232
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7733
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x5008
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21784
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x322
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1267
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1802
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7984
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x23717
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x23215
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x2083
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3522
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x371
1775F
Laboratory on Pluto
constructive algorithms
,
dp
,
greedy
,
math
2500
x769
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x14147
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x18852
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19741
1774H
Maximum Permutation
constructive algorithms
3500
x135
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x443
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7975
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x12116
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x12403
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x22522
1773K
King's Puzzle
constructive algorithms
1900
x1440
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x109
1773F
Football
constructive algorithms
800
x4188
1773A
Amazing Trick
constructive algorithms
,
graph matchings
,
math
,
probabilities
1900
x1568
1772F
Copy of a Copy of a Copy
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
sortings
2000
x2409
1772D
Absolute Sorting
constructive algorithms
,
math
1400
x16134
1772C
Different Differences
constructive algorithms
,
greedy
,
math
1000
x23992
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x14711
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x106
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3889
1770B
Koxia and Permutation
constructive algorithms
1000
x19478
1768D
Lucky Permutation
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1800
x7261
1768C
Elemental Decompress
constructive algorithms
,
greedy
,
implementation
,
sortings
1300
x14310
1767D
Playoff
combinatorics
,
constructive algorithms
,
dp
,
greedy
,
math
1500
x10016
1765G
Guess the String
constructive algorithms
,
interactive
,
probabilities
2600
x399
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4234
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x978
1763C
Another Array Problem
brute force
,
constructive algorithms
,
greedy
2000
x6721
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15766
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x102
1762D
GCD Queries
constructive algorithms
,
interactive
,
number theory
2100
x3692
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