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ICPC Challenge
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Before contest
Kotlin Heroes: Episode 9
30:34:37
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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
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x4701
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x144
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x222
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x597
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x464
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1686
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22138
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x103
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x130
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x298
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1286
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4747
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x11627
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x882
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x395
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x304
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1777
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x807
1437G
Death DBMS
data structures
,
string suffix structures
,
strings
,
trees
2600
x875
1400F
x-prime Substrings
brute force
,
dfs and similar
,
dp
,
string suffix structures
,
strings
2800
x726
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x302
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x327
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x116
1327G
Letters and Question Marks
bitmasks
,
dp
,
string suffix structures
2800
x384
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9175
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11353
1276F
Asterisk Substrings
string suffix structures
3400
x273
1266G
Permutation Concatenation
string suffix structures
3300
x111
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x850
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1584
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6387
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x867
1098F
Ж-function
string suffix structures
,
strings
3500
x187
1073G
Yet Another LCP Problem
data structures
,
string suffix structures
2600
x773
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x698
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x203
1037H
Security
data structures
,
string suffix structures
3200
x822
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1693
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x596
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x763
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x112
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1249
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x379
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1211
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1207
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x694
802I
Fake News (hard)
string suffix structures
2300
x1290
756D
Bacterial Melee
brute force
,
combinatorics
,
dp
,
string suffix structures
2400
x947
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x152
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1050
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1552
700E
Cool Slogans
string suffix structures
,
strings
3300
x1045
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1194
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x894
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2488
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1937
616F
Expensive Strings
string suffix structures
,
strings
2700
x513
594E
Cutting the Line
string suffix structures
,
strings
3100
x144
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1018
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1796
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3651
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x840
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2009
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x510
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6170
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x815
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x6909
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x966
441D
Valera and Swaps
constructive algorithms
,
dsu
,
graphs
,
implementation
,
math
,
string suffix structures
2100
x1034
432D
Prefixes and Suffixes
dp
,
string suffix structures
,
strings
,
two pointers
2000
x7610
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2013
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x382
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x575
316G3
Good Substrings
string suffix structures
2400
x435
316G2
Good Substrings
string suffix structures
2200
x437
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1815
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x427
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1017
149E
Martian Strings
string suffix structures
,
strings
2300
x1905
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2378
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x16610
123D
String
string suffix structures
2300
x1133
86C
Genetic engineering
dp
,
string suffix structures
,
trees
2500
x636
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1012
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