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Contest is running
Codeforces Round 937 (Div. 4)
00:28:07
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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
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x94
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x96
1394E
Boboniu and Banknote Collection
strings
3500
x122
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x144
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x169
1098F
Ж-function
string suffix structures
,
strings
3500
x200
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x212
1110H
Modest Substrings
dp
,
strings
3500
x264
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x90
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x119
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x124
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x273
1738H
Palindrome Addicts
data structures
,
strings
3300
x221
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x408
700E
Cool Slogans
string suffix structures
,
strings
3300
x1101
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x131
1056H
Detect Robots
data structures
,
strings
3200
x139
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x313
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x337
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x451
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x472
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x632
590E
Birthday
graph matchings
,
strings
3200
x722
269E
String Theory
geometry
,
math
,
strings
3100
x106
594E
Cutting the Line
string suffix structures
,
strings
3100
x153
1205E
Expected Value Again
combinatorics
,
strings
3100
x251
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x314
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x259
1909G
Pumping Lemma
hashing
,
strings
3000
x304
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x351
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x396
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x419
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x665
587F
Duff is Mad
data structures
,
strings
3000
x963
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1399
1431I
Cyclic Shifts
*special problem
,
strings
2900
x41
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x193
1038F
Wrap Around
dp
,
strings
2900
x289
1055F
Tree and XOR
strings
,
trees
2900
x439
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x861
17E
Palisection
strings
2900
x1475
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x266
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x293
1012D
AB-Strings
constructive algorithms
,
strings
2800
x313
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x358
1082F
Speed Dial
dp
,
strings
,
trees
2800
x397
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x459
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x501
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x595
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x663
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x688
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x750
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1022
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1491
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1906
1065G
Fibonacci Suffix
strings
2700
x238
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x409
477D
Dreamoon and Binary
dp
,
strings
2700
x488
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x504
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x505
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x517
1366G
Construct the String
data structures
,
dp
,
strings
2700
x525
616F
Expensive Strings
string suffix structures
,
strings
2700
x547
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x717
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x754
827E
Rusty String
fft
,
math
,
strings
2700
x780
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x820
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x925
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1961
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x157
177G2
Fibonacci Strings
matrices
,
strings
2600
x166
1090J
Two Prefixes
strings
2600
x398
955D
Scissors
brute force
,
strings
2600
x433
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x476
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x501
150D
Mission Impassable
dp
,
strings
2600
x579
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x827
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x837
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x854
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x859
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x926
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x944
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1059
1270F
Awesome Substrings
math
,
strings
2600
x1084
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1106
1363F
Rotating Substrings
dp
,
strings
2600
x1266
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x381
119D
String Transformation
hashing
,
strings
2500
x468
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x744
666C
Codeword
combinatorics
,
strings
2500
x755
610E
Alphabet Permutations
data structures
,
strings
2500
x768
607C
Marbles
hashing
,
strings
2500
x776
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x844
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x936
1701E
Text Editor
brute force
,
dp
,
greedy
,
strings
2500
x1049
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1069
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1149
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1177
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1202
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1317
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