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Codeforces Round (Div. 2)
3 days
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strings
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
722B
Verse Pattern
implementation
,
strings
1200
x6366
721B
Passwords
implementation
,
math
,
sortings
,
strings
1100
x12012
712B
Memory and Trident
implementation
,
strings
1100
x9672
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1727
708A
Letters Cyclic Shift
constructive algorithms
,
greedy
,
implementation
,
strings
1200
x8941
706C
Hard problem
dp
,
strings
1600
x15830
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x14164
700E
Cool Slogans
string suffix structures
,
strings
3300
x1154
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5687
696D
Legen...
data structures
,
dp
,
matrices
,
strings
2500
x1247
691C
Exponential notation
implementation
,
strings
1800
x2544
691B
s-palindrome
implementation
,
strings
1600
x4768
682D
Alyona and Strings
dp
,
strings
1900
x3252
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6325
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18369
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17147
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x848
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3166
666C
Codeword
combinatorics
,
strings
2500
x772
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3430
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2968
665C
Simple Strings
dp
,
greedy
,
strings
1300
x9603
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x971
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4909
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1228
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x911
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1948
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2709
632C
The Smallest String Concatenation
sortings
,
strings
1700
x7428
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2014
629C
Famil Door and Brackets
dp
,
strings
2000
x2753
628C
Bear and String Distance
greedy
,
strings
1300
x5746
625B
War of the Corporations
constructive algorithms
,
greedy
,
strings
1200
x10217
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x710
616F
Expensive Strings
string suffix structures
,
strings
2700
x560
616A
Comparing Two Long Integers
implementation
,
strings
900
x9655
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2261
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x457
612A
The Text Splitting
brute force
,
implementation
,
strings
1300
x7084
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2533
610E
Alphabet Permutations
data structures
,
strings
2500
x857
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6686
607C
Marbles
hashing
,
strings
2500
x781
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1100
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x5934
600A
Extract Numbers
implementation
,
strings
1600
x5113
598B
Queries on a String
implementation
,
strings
1300
x10705
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x390
594E
Cutting the Line
string suffix structures
,
strings
3100
x158
591B
Rebranding
implementation
,
strings
1200
x8161
590E
Birthday
graph matchings
,
strings
3200
x758
587F
Duff is Mad
data structures
,
strings
3000
x1005
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x640
584C
Marina and Vasya
constructive algorithms
,
greedy
,
strings
1700
x6093
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1987
566A
Matching Names
dfs and similar
,
strings
,
trees
2300
x877
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10462
558E
A Simple Task
data structures
,
sortings
,
strings
2300
x5759
557E
Ann and Half-Palindrome
data structures
,
dp
,
graphs
,
string suffix structures
,
strings
,
trees
2300
x1070
554B
Ohana Cleans Up
brute force
,
greedy
,
strings
1200
x9784
554A
Kyoya and Photobooks
brute force
,
math
,
strings
900
x12903
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1467
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3775
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x36910
549A
Face Detection
implementation
,
strings
900
x9400
548A
Mike and Fax
brute force
,
implementation
,
strings
1100
x9873
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1971
544A
Set of Strings
implementation
,
strings
1100
x7895
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3865
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x873
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2235
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2330
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2117
525B
Pasha and String
constructive algorithms
,
greedy
,
math
,
strings
1400
x9254
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x14140
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x523
520C
DNA Alignment
math
,
strings
1500
x4111
520A
Pangram
implementation
,
strings
800
x92289
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7873
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9152
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6592
509E
Pretty Song
math
,
strings
2000
x1777
508B
Anton and currency you all know
greedy
,
math
,
strings
1300
x22293
506E
Mr. Kitayuta's Gift
combinatorics
,
dp
,
matrices
,
strings
3000
x701
505A
Mr. Kitayuta's Gift
brute force
,
implementation
,
strings
1100
x6623
501B
Misha and Changing Handles
data structures
,
dsu
,
strings
1100
x15807
499B
Lecture
implementation
,
strings
1000
x38159
494B
Obsessive String
dp
,
strings
2000
x2618
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x8976
477D
Dreamoon and Binary
dp
,
strings
2700
x520
476E
Dreamoon and Strings
dp
,
strings
2200
x1780
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x7635
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1779
464A
No to Palindromes!
greedy
,
strings
1700
x5837
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x369
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5765
452E
Three strings
data structures
,
dsu
,
string suffix structures
,
strings
2400
x1048
452A
Eevee
brute force
,
implementation
,
strings
1000
x7931
448B
Suffix Structures
implementation
,
strings
1400
x15794
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x757
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