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Before contest
Codeforces Round 945 (Div. 2)
05:11:37
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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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Status
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Custom test
Problems
#
Name
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x18827
1243B2
Character Swap (Hard Version)
strings
1600
x6855
1243B1
Character Swap (Easy Version)
strings
1000
x14571
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x5738
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x680
1223B
Strings Equalization
strings
1000
x14438
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x9903
1220A
Cards
implementation
,
sortings
,
strings
800
x28871
1219C
Periodic integer number
implementation
,
strings
1700
x1757
1216A
Prefixes
strings
800
x18386
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2335
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1100
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x969
1205E
Expected Value Again
combinatorics
,
strings
3100
x270
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2972
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2849
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1909
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5017
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2475
1201A
Important Exam
implementation
,
strings
900
x15333
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6986
1194C
From S To T
implementation
,
strings
1300
x12921
1189A
Keanu Reeves
strings
800
x15048
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x11985
1185B
Email from Polycarp
implementation
,
strings
1200
x12895
1183H
Subsequences (hard version)
dp
,
strings
1900
x2921
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4383
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x10993
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6190
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4129
1178B
WOW Factor
dp
,
strings
1300
x14011
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x775
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x18794
1163D
Mysterious Code
dp
,
strings
2100
x1218
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2201
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6135
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x13588
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7266
1151A
Maxim and Biology
brute force
,
strings
1000
x10986
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1868
1147B
Chladni Figure
brute force
,
strings
1900
x2811
1146B
Hate "A"
implementation
,
strings
1100
x8333
1146A
Love "A"
implementation
,
strings
800
x21452
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4063
1144A
Diverse Strings
implementation
,
strings
800
x18855
1140B
Good String
implementation
,
strings
1200
x11146
1139A
Even Substrings
implementation
,
strings
800
x16462
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3939
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5887
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1120
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x898
1120C
Compress String
dp
,
strings
2100
x1871
1111A
Superhero Transformation
implementation
,
strings
1000
x16581
1110H
Modest Substrings
dp
,
strings
3500
x276
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4271
1107A
Digits Sequence Dividing
greedy
,
strings
900
x11889
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9797
1102D
Balanced Ternary String
greedy
,
strings
1500
x7831
1098F
Ж-function
string suffix structures
,
strings
3500
x217
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x93
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x10344
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16191
1092C
Prefixes and Suffixes
strings
1700
x5787
1090J
Two Prefixes
strings
2600
x417
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x857
1085A
Right-Left Cipher
implementation
,
strings
800
x12064
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1846
1082F
Speed Dial
dp
,
strings
,
trees
2800
x408
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x99
1080E
Sonya and Matrix Beauty
strings
2400
x888
1076A
Minimizing the String
greedy
,
strings
1200
x12847
1073A
Diverse Substring
implementation
,
strings
1000
x14917
1065G
Fibonacci Suffix
strings
2700
x239
1065E
Side Transmutations
combinatorics
,
strings
2300
x1021
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10226
1056H
Detect Robots
data structures
,
strings
3200
x146
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1988
1055F
Tree and XOR
strings
,
trees
2900
x447
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x616
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x878
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8319
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x164
1045I
Palindrome Pairs
hashing
,
strings
1600
x4118
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1038F
Wrap Around
dp
,
strings
2900
x296
1038A
Equality
implementation
,
strings
800
x14423
1037C
Equalize
dp
,
greedy
,
strings
1300
x18340
1029A
Many Equal Substrings
implementation
,
strings
1300
x12019
1027A
Palindromic Twist
implementation
,
strings
1000
x15575
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8523
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x813
1015F
Bracket Substring
dp
,
strings
2300
x1049
1012D
AB-Strings
constructive algorithms
,
strings
2800
x316
1008A
Romaji
implementation
,
strings
900
x14748
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x22401
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1101
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x6981
989A
A Blend of Springtime
implementation
,
strings
900
x10161
988B
Substrings Sort
sortings
,
strings
1100
x17903
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