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Codeforces Round (Div. 3)
41:04:57
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Difficulty:
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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
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x949
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x948
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x868
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x862
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x848
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x843
150D
Mission Impassable
dp
,
strings
2600
x584
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x512
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x479
955D
Scissors
brute force
,
strings
2600
x456
1090J
Two Prefixes
strings
2600
x413
177G2
Fibonacci Strings
matrices
,
strings
2600
x171
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x163
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1982
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x948
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x856
827E
Rusty String
fft
,
math
,
strings
2700
x788
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x766
1422E
Minlexes
dp
,
greedy
,
implementation
,
strings
2700
x728
616F
Expensive Strings
string suffix structures
,
strings
2700
x550
1366G
Construct the String
data structures
,
dp
,
strings
2700
x531
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x513
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x511
477D
Dreamoon and Binary
dp
,
strings
2700
x499
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x417
1065G
Fibonacci Suffix
strings
2700
x239
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1931
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1520
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1051
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x772
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x700
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x672
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x611
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x504
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x464
1082F
Speed Dial
dp
,
strings
,
trees
2800
x406
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x368
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x324
1012D
AB-Strings
constructive algorithms
,
strings
2800
x316
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x286
17E
Palisection
strings
2900
x1504
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x872
1055F
Tree and XOR
strings
,
trees
2900
x446
1038F
Wrap Around
dp
,
strings
2900
x292
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x197
1431I
Cyclic Shifts
*special problem
,
strings
2900
x42
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1420
587F
Duff is Mad
data structures
,
strings
3000
x990
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x683
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x437
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x400
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x365
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x324
1909G
Pumping Lemma
hashing
,
strings
3000
x318
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x324
1205E
Expected Value Again
combinatorics
,
strings
3100
x262
594E
Cutting the Line
string suffix structures
,
strings
3100
x155
269E
String Theory
geometry
,
math
,
strings
3100
x107
590E
Birthday
graph matchings
,
strings
3200
x742
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x635
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x488
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x453
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x346
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x323
1056H
Detect Robots
data structures
,
strings
3200
x144
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x132
700E
Cool Slogans
string suffix structures
,
strings
3300
x1122
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x427
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x339
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x121
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x92
1110H
Modest Substrings
dp
,
strings
3500
x274
1098F
Ж-function
string suffix structures
,
strings
3500
x217
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x178
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x148
1394E
Boboniu and Banknote Collection
strings
3500
x129
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x97
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x97
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