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Codeforces Round #715 (Div. 1)
2 days
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Before contest
Codeforces Round #715 (Div. 2)
2 days
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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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Problems
#
Name
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x92
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x587
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1355
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x501
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x399
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x140
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x196
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x55
1327G
Letters and Question Marks
bitmasks
,
dp
,
string suffix structures
2800
x282
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x6560
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x8749
1266G
Permutation Concatenation
string suffix structures
3300
x73
1276F
Asterisk Substrings
string suffix structures
3400
x127
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x479
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x3682
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x835
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x642
1098F
Ж-function
string suffix structures
,
strings
3500
x65
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x84
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x402
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x334
1037H
Security
data structures
,
string suffix structures
3200
x413
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x921
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x329
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x396
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x68
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x553
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x183
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x725
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x762
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x447
802I
Fake News (hard)
string suffix structures
2300
x619
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x730
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x122
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x645
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x752
700E
Cool Slogans
string suffix structures
,
strings
3300
x648
666E
Forensic Examination
data structures
,
string suffix structures
3100
x731
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x575
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1633
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x1953
616F
Expensive Strings
string suffix structures
,
strings
2700
x356
594E
Cutting the Line
string suffix structures
,
strings
3100
x97
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x871
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x980
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x698
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x2805
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x1387
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x349
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x4372
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x417
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x4380
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x670
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x855
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x4506
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x1458
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x212
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x374
316G3
Good Substrings
string suffix structures
2400
x329
316G2
Good Substrings
string suffix structures
2200
x371
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1059
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x318
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x624
149E
Martian Strings
string suffix structures
,
strings
2300
x1471
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1780
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x10025
123D
String
string suffix structures
2300
x778
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x467
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x744
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