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Before contest
Codeforces Round #793 (Div. 2)
02:52:49
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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
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x10117
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x9386
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x12648
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x7733
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x5347
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3223
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2143
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x5792
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x5023
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x4646
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2074
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1765
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x946
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x3844
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x1680
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x1613
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x826
316G2
Good Substrings
string suffix structures
2200
x388
149E
Martian Strings
string suffix structures
,
strings
2300
x1619
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x913
123D
String
string suffix structures
2300
x898
802I
Fake News (hard)
string suffix structures
2300
x873
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x807
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1556
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1104
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1004
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x930
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x917
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x805
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x794
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x768
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x754
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x542
316G3
Good Substrings
string suffix structures
2400
x350
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1223
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x985
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x532
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x724
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x701
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x699
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x652
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x559
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1332
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x616
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x446
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x429
616F
Expensive Strings
string suffix structures
,
strings
2700
x420
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x260
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1279
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x778
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x494
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x416
1327G
Letters and Question Marks
bitmasks
,
dp
,
string suffix structures
2800
x310
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x227
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x517
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x364
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x76
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x791
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x596
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x264
666E
Forensic Examination
data structures
,
string suffix structures
3100
x937
594E
Cutting the Line
string suffix structures
,
strings
3100
x108
1037H
Security
data structures
,
string suffix structures
3200
x594
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x172
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x168
700E
Cool Slogans
string suffix structures
,
strings
3300
x831
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x510
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x251
1266G
Permutation Concatenation
string suffix structures
3300
x97
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x222
1276F
Asterisk Substrings
string suffix structures
3400
x185
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x135
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x77
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x125
1098F
Ж-function
string suffix structures
,
strings
3500
x101
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x87
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x69
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