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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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Difficulty:
—
implementation
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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Custom test
Problems
#
Name
1088D
Ehab and another another xor problem
bitmasks
,
constructive algorithms
,
implementation
,
interactive
2000
x2765
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2843
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2871
1209G1
Into Blocks (easy version)
data structures
,
dsu
,
greedy
,
implementation
,
two pointers
2000
x2874
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2888
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2945
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3062
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3170
1682D
Circular Spanning Tree
constructive algorithms
,
implementation
,
trees
2000
x3180
1316D
Nash Matrix
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2000
x3207
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3293
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3347
1427D
Unshuffling a Deck
constructive algorithms
,
implementation
2000
x3374
1266D
Decreasing Debts
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
math
,
two pointers
2000
x3412
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3529
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3551
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3680
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3731
1237D
Balanced Playlist
binary search
,
data structures
,
implementation
2000
x3794
1301D
Time to Run
constructive algorithms
,
graphs
,
implementation
2000
x3811
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3959
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4020
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4047
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4052
1514D
Cut and Stick
binary search
,
data structures
,
greedy
,
implementation
,
sortings
2000
x4103
1408D
Searchlights
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
sortings
,
two pointers
2000
x4168
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4198
1349C
Orac and Game of Life
dfs and similar
,
graphs
,
implementation
,
shortest paths
2000
x4239
1525C
Robot Collisions
data structures
,
greedy
,
implementation
,
sortings
2000
x4337
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4363
1487E
Cheap Dinner
brute force
,
data structures
,
graphs
,
greedy
,
implementation
,
sortings
,
two pointers
2000
x4380
1481D
AB Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2000
x4402
1567D
Expression Evaluation Error
constructive algorithms
,
greedy
,
implementation
,
math
2000
x4409
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4433
1183E
Subsequences (easy version)
dp
,
graphs
,
implementation
,
shortest paths
2000
x4530
1536D
Omkar and Medians
data structures
,
greedy
,
implementation
2000
x4561
1380D
Berserk And Fireball
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
2000
x4626
1391D
505
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
implementation
2000
x4941
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6134
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7004
1359D
Yet Another Yet Another Task
data structures
,
dp
,
implementation
,
two pointers
2000
x8974
1370D
Odd-Even Subsequence
binary search
,
dp
,
dsu
,
greedy
,
implementation
2000
x9151
784D
Touchy-Feely Palindromes
*special problem
,
implementation
1900
x425
38D
Vasya the Architect
implementation
1900
x478
412E
E-mail Addresses
implementation
1900
x808
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x879
784F
Crunching Numbers Just for You
*special problem
,
implementation
1900
x1000
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1066
420C
Bug in Code
data structures
,
graphs
,
implementation
,
two pointers
1900
x1206
452D
Washer, Dryer, Folder
greedy
,
implementation
1900
x1474
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1504
285D
Permutation Sum
bitmasks
,
combinatorics
,
dp
,
implementation
,
meet-in-the-middle
1900
x1511
16D
Logging
implementation
,
strings
1900
x1514
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1619
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1622
653C
Bear and Up-Down
brute force
,
implementation
1900
x1623
362C
Insertion Sort
data structures
,
dp
,
implementation
,
math
1900
x1655
746E
Numbers Exchange
greedy
,
implementation
,
math
1900
x1709
21A
Jabber ID
implementation
,
strings
1900
x1784
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1815
356B
Xenia and Hamming
implementation
,
math
1900
x1888
1912A
Accumulator Apex
data structures
,
implementation
,
sortings
1900
x1894
404D
Minesweeper 1D
dp
,
implementation
1900
x2063
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2094
549D
Haar Features
greedy
,
implementation
1900
x2126
353B
Two Heaps
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1900
x2177
1054D
Changing Array
greedy
,
implementation
1900
x2215
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2436
1032D
Barcelonian Distance
geometry
,
implementation
1900
x2631
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2658
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2659
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2762
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2840
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2870
893D
Credit Card
data structures
,
dp
,
greedy
,
implementation
1900
x2928
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2963
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2988
1181C
Flag
brute force
,
combinatorics
,
dp
,
implementation
1900
x3006
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3008
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3056
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3087
708B
Recover the String
constructive algorithms
,
greedy
,
implementation
,
math
1900
x3201
811C
Vladik and Memorable Trip
dp
,
implementation
1900
x3204
550D
Regular Bridge
constructive algorithms
,
graphs
,
implementation
1900
x3244
839B
Game of the Rows
brute force
,
greedy
,
implementation
1900
x3266
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3272
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3319
1361B
Johnny and Grandmaster
greedy
,
implementation
,
math
,
sortings
1900
x3393
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3441
1921F
Sum of Progression
brute force
,
data structures
,
dp
,
implementation
,
math
1900
x3474
1163C2
Power Transmission (Hard Edition)
data structures
,
geometry
,
implementation
,
math
1900
x3531
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3548
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3567
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3597
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3608
1902D
Robot Queries
binary search
,
data structures
,
dp
,
implementation
1900
x3707
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3710
1482D
Playlist
data structures
,
dsu
,
implementation
,
shortest paths
1900
x3737
1029D
Concatenated Multiples
implementation
,
math
1900
x3758
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3835
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