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strings
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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Problems
#
Name
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x846
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x818
610E
Alphabet Permutations
data structures
,
strings
2500
x811
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x810
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x801
827E
Rusty String
fft
,
math
,
strings
2700
x792
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x781
607C
Marbles
hashing
,
strings
2500
x779
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x774
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x769
666C
Codeword
combinatorics
,
strings
2500
x765
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x755
590E
Birthday
graph matchings
,
strings
3200
x744
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x744
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x730
58D
Calendar
greedy
,
strings
2000
x713
180D
Name
greedy
,
strings
1900
x708
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x702
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x685
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x680
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x673
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x637
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x616
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x613
150D
Mission Impassable
dp
,
strings
2600
x586
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x578
1331F
Elementary!
*special problem
,
brute force
,
dp
,
strings
x553
616F
Expensive Strings
string suffix structures
,
strings
2700
x553
1366G
Construct the String
data structures
,
dp
,
strings
2700
x532
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x521
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x518
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x516
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x514
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x513
54D
Writing a Song
brute force
,
dp
,
strings
2100
x506
477D
Dreamoon and Binary
dp
,
strings
2700
x500
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x489
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x480
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x477
119D
String Transformation
hashing
,
strings
2500
x474
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x466
955D
Scissors
brute force
,
strings
2600
x458
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x453
1055F
Tree and XOR
strings
,
trees
2900
x446
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x438
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x429
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x426
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x418
1090J
Two Prefixes
strings
2600
x416
1082F
Speed Dial
dp
,
strings
,
trees
2800
x408
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x400
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x388
38F
Smart Boy
dp
,
games
,
strings
2100
x375
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x368
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x366
1952H
Palindrome
implementation
,
strings
x349
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x349
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x346
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x342
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x332
1663F
In Every Generation...
*special problem
,
strings
x328
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x326
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x325
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x324
1909G
Pumping Lemma
hashing
,
strings
3000
x318
1012D
AB-Strings
constructive algorithms
,
strings
2800
x316
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x314
100D
World of Mouth
*special problem
,
strings
1500
x297
1038F
Wrap Around
dp
,
strings
2900
x295
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x288
1110H
Modest Substrings
dp
,
strings
3500
x276
1205E
Expected Value Again
combinatorics
,
strings
3100
x265
1065G
Fibonacci Suffix
strings
2700
x239
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1098F
Ж-function
string suffix structures
,
strings
3500
x217
1532F
Prefixes and Suffixes
*special problem
,
strings
x215
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x204
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x197
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x180
177G2
Fibonacci Strings
matrices
,
strings
2600
x171
177G1
Fibonacci Strings
strings
2400
x164
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x163
594E
Cutting the Line
string suffix structures
,
strings
3100
x155
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x150
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x150
1056H
Detect Robots
data structures
,
strings
3200
x146
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x132
1662B
Toys
greedy
,
strings
x131
1394E
Boboniu and Banknote Collection
strings
3500
x129
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x122
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
269E
String Theory
geometry
,
math
,
strings
3100
x107
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x99
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x99
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x97
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x93
345G
Suffix Subgroup
*special problem
,
strings
2200
x51
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