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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
38:07:20
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Difficulty:
—
string suffix structures
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
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x107
1266G
Permutation Concatenation
string suffix structures
3300
x116
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x119
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x121
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x146
594E
Cutting the Line
string suffix structures
,
strings
3100
x154
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x169
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x177
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x214
1098F
Ж-function
string suffix structures
,
strings
3500
x215
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x283
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x314
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x321
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x326
1276F
Asterisk Substrings
string suffix structures
3400
x329
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x343
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x366
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x399
1327G
Letters and Question Marks
bitmasks
,
dp
,
string suffix structures
2800
x400
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x414
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x421
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x424
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x439
316G2
Good Substrings
string suffix structures
2200
x464
316G3
Good Substrings
string suffix structures
2400
x484
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x496
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x505
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x520
616F
Expensive Strings
string suffix structures
,
strings
2700
x549
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x599
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x646
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x662
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x679
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x738
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x765
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x795
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x841
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x856
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x856
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x859
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x867
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x895
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x909
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x935
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x943
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x947
1037H
Security
data structures
,
string suffix structures
3200
x951
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x972
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1022
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1041
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1046
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1059
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1072
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1108
700E
Cool Slogans
string suffix structures
,
strings
3300
x1109
123D
String
string suffix structures
2300
x1177
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1284
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1286
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1295
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1323
802I
Fake News (hard)
string suffix structures
2300
x1406
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1413
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1660
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1772
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1793
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1799
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1845
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1928
149E
Martian Strings
string suffix structures
,
strings
2300
x1965
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1972
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1972
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2081
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2088
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2450
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2578
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3707
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4955
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5504
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6443
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6828
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x7386
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8143
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9488
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11576
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12195
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17658
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22522
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