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Problems
#
Name
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1371
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3114
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x333
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x502
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x289
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5593
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x180
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x351
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x671
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x514
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1818
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22580
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x109
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x150
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x324
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1329
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4991
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12291
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x913
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x418
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x434
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1856
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x849
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x953
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x787
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x350
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x371
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x125
1327G
Letters and Question Marks
bitmasks
,
dp
,
string suffix structures
2800
x407
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9615
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11664
1276F
Asterisk Substrings
string suffix structures
3400
x333
1266G
Permutation Concatenation
string suffix structures
3300
x117
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x969
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1909
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6991
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x898
1098F
Ж-function
string suffix structures
,
strings
3500
x217
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x865
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x802
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1037H
Security
data structures
,
string suffix structures
3200
x984
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1809
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x657
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x877
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x122
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1451
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x429
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1294
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1345
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x764
802I
Fake News (hard)
string suffix structures
2300
x1430
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x976
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x174
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1121
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1677
700E
Cool Slogans
string suffix structures
,
strings
3300
x1126
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1329
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x957
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2653
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1995
616F
Expensive Strings
string suffix structures
,
strings
2700
x553
594E
Cutting the Line
string suffix structures
,
strings
3100
x155
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1055
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1945
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3784
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x866
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2098
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6502
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x871
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x7482
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1039
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1061
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x8307
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2103
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x400
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x613
316G3
Good Substrings
string suffix structures
2400
x488
316G2
Good Substrings
string suffix structures
2200
x466
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x2015
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x441
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1091
149E
Martian Strings
string suffix structures
,
strings
2300
x1970
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2464
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17871
123D
String
string suffix structures
2300
x1182
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x684
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1048
→ Pay attention
Before contest
Codeforces Round 946 (Div. 3)
2 days
Register now »
→ 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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