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→ Pay attention
Before contest
Codeforces Round #792 (Div. 1)
3 days
Before contest
Codeforces Round #792 (Div. 2)
3 days
→ Filter Problems
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
x69
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x86
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x172
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x985
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x3842
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x9359
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x720
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x260
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x221
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1552
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x701
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x652
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x494
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x168
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x227
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x76
1327G
Letters and Question Marks
bitmasks
,
dp
,
string suffix structures
2800
x309
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x7726
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x10108
1276F
Asterisk Substrings
string suffix structures
3400
x185
1266G
Permutation Concatenation
string suffix structures
3300
x97
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x616
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1101
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x4628
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x754
1098F
Ж-function
string suffix structures
,
strings
3500
x101
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x558
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x509
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x125
1037H
Security
data structures
,
string suffix structures
3200
x593
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1221
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x446
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x517
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x77
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x788
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x251
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x929
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x917
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x542
802I
Fake News (hard)
string suffix structures
2300
x870
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x805
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x135
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x807
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1004
700E
Cool Slogans
string suffix structures
,
strings
3300
x829
666E
Forensic Examination
data structures
,
string suffix structures
3100
x934
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x698
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2141
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1764
616F
Expensive Strings
string suffix structures
,
strings
2700
x420
594E
Cutting the Line
string suffix structures
,
strings
3100
x108
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x912
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1272
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3223
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x768
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x1611
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x429
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x5012
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x595
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x5342
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x794
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x944
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x5781
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x1679
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x264
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x416
316G3
Good Substrings
string suffix structures
2400
x350
316G2
Good Substrings
string suffix structures
2200
x388
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1330
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x355
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x776
149E
Martian Strings
string suffix structures
,
strings
2300
x1618
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2071
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x12623
123D
String
string suffix structures
2300
x898
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x530
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x823
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