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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
39:05:08
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Difficulty:
—
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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Problems
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Status
Standings
Custom test
Problems
#
Name
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4379
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5420
1092C
Prefixes and Suffixes
strings
1700
x5744
464A
No to Palindromes!
greedy
,
strings
1700
x5806
584C
Marina and Vasya
constructive algorithms
,
greedy
,
strings
1700
x6057
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6232
1690F
Shifting String
graphs
,
math
,
number theory
,
strings
1700
x6759
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x6952
632C
The Smallest String Concatenation
sortings
,
strings
1700
x7167
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7192
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7854
1688C
Manipulating History
constructive algorithms
,
greedy
,
strings
1700
x7871
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8273
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x8889
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x8999
1295B
Infinite Prefixes
math
,
strings
1700
x9057
1473D
Program
data structures
,
dp
,
implementation
,
strings
1700
x9278
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10217
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10332
778A
String Game
binary search
,
greedy
,
strings
1700
x11047
1628B
Peculiar Movie Preferences
greedy
,
strings
1700
x11150
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11802
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12722
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17658
774K
Stepan and Vowels
*special problem
,
implementation
,
strings
1600
x1253
95A
Hockey
implementation
,
strings
1600
x1640
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x1715
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1964
113A
Grammar Lessons
implementation
,
strings
1600
x2229
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2582
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2586
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3733
1045I
Palindrome Pairs
hashing
,
strings
1600
x4052
906A
Shockers
implementation
,
strings
1600
x4085
832B
Petya and Exam
implementation
,
strings
1600
x4323
691B
s-palindrome
implementation
,
strings
1600
x4694
600A
Extract Numbers
implementation
,
strings
1600
x4838
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5681
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6281
1243B2
Character Swap (Hard Version)
strings
1600
x6842
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x6984
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7071
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7607
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8534
518A
Vitaly and Strings
constructive algorithms
,
strings
1600
x9102
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9378
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9441
1321C
Remove Adjacent
brute force
,
constructive algorithms
,
greedy
,
strings
1600
x9442
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9603
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9742
1886C
Decreasing String
implementation
,
strings
1600
x10082
1511D
Min Cost String
brute force
,
constructive algorithms
,
graphs
,
greedy
,
strings
1600
x11009
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x11690
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x11840
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12195
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x12517
1348C
Phoenix and Distribution
constructive algorithms
,
greedy
,
sortings
,
strings
1600
x14167
706C
Hard problem
dp
,
strings
1600
x15563
100D
World of Mouth
*special problem
,
strings
1500
x297
883E
Field of Wonders
implementation
,
strings
1500
x1875
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1925
250B
Restoring IPv6
implementation
,
strings
1500
x1944
121B
Lucky Transformation
strings
1500
x2522
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2778
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3198
278B
New Problem
brute force
,
strings
1500
x3415
91A
Newspaper Headline
greedy
,
strings
1500
x3446
358B
Dima and Text Messages
brute force
,
strings
1500
x3674
144C
Anagram Search
implementation
,
strings
1500
x3879
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x3956
520C
DNA Alignment
math
,
strings
1500
x4078
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4080
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4246
748B
Santa Claus and Keyboard Check
implementation
,
strings
1500
x5269
50B
Choosing Symbol Pairs
strings
1500
x5521
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5597
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6169
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6266
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6463
1102D
Balanced Ternary String
greedy
,
strings
1500
x7800
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x10036
1742F
Smaller
constructive algorithms
,
greedy
,
strings
1500
x10688
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x10956
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11478
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11576
1379A
Acacius and String
brute force
,
implementation
,
strings
1500
x11594
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11950
1924A
Did We Get Everything Covered?
constructive algorithms
,
dp
,
greedy
,
shortest paths
,
strings
1500
x12109
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x12840
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13267
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x13600
1404A
Balanced Bitstring
implementation
,
strings
1500
x14718
1332C
K-Complete Word
dfs and similar
,
dsu
,
greedy
,
implementation
,
strings
1500
x15546
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x17968
1368B
Codeforces Subsequences
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1500
x18969
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x36093
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x515
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2911
898C
Phone Numbers
implementation
,
strings
1400
x5122
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5657
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