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Codeforces Round (Div. 2)
44:25:20
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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
1284A
New Year and Naming
implementation
,
strings
800
x17950
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2223
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x16370
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1918
1270F
Awesome Substrings
math
,
strings
2600
x1118
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8503
1267L
Lexicography
constructive algorithms
,
strings
1800
x3006
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15819
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3262
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x331
1251B
Binary Palindromes
greedy
,
strings
1400
x10928
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x19349
1243B2
Character Swap (Hard Version)
strings
1600
x7054
1243B1
Character Swap (Easy Version)
strings
1000
x14766
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x5915
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x827
1223B
Strings Equalization
strings
1000
x14653
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10128
1220A
Cards
implementation
,
sortings
,
strings
800
x29332
1219C
Periodic integer number
implementation
,
strings
1700
x1768
1216A
Prefixes
strings
800
x18505
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2539
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x121
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1115
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x988
1205E
Expected Value Again
combinatorics
,
strings
3100
x273
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x3211
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x3044
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x2001
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5052
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2505
1201A
Important Exam
implementation
,
strings
900
x15460
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7316
1194C
From S To T
implementation
,
strings
1300
x13043
1189A
Keanu Reeves
strings
800
x15155
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x12118
1185B
Email from Polycarp
implementation
,
strings
1200
x13234
1183H
Subsequences (hard version)
dp
,
strings
1900
x3102
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4400
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x11064
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6240
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4290
1178B
WOW Factor
dp
,
strings
1300
x14730
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x788
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x19124
1163D
Mysterious Code
dp
,
strings
2100
x1236
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2211
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6167
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x14264
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7349
1151A
Maxim and Biology
brute force
,
strings
1000
x11114
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1877
1147B
Chladni Figure
brute force
,
strings
1900
x2829
1146B
Hate "A"
implementation
,
strings
1100
x8473
1146A
Love "A"
implementation
,
strings
800
x21664
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4099
1144A
Diverse Strings
implementation
,
strings
800
x19039
1140B
Good String
implementation
,
strings
1200
x11249
1139A
Even Substrings
implementation
,
strings
800
x16643
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3997
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5998
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1132
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x911
1120C
Compress String
dp
,
strings
2100
x2082
1111A
Superhero Transformation
implementation
,
strings
1000
x16746
1110H
Modest Substrings
dp
,
strings
3500
x279
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4292
1107A
Digits Sequence Dividing
greedy
,
strings
900
x11986
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9842
1102D
Balanced Ternary String
greedy
,
strings
1500
x7907
1098F
Ж-function
string suffix structures
,
strings
3500
x218
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x94
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x10475
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16348
1092C
Prefixes and Suffixes
strings
1700
x5848
1090J
Two Prefixes
strings
2600
x423
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x918
1085A
Right-Left Cipher
implementation
,
strings
800
x12093
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1889
1082F
Speed Dial
dp
,
strings
,
trees
2800
x414
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x100
1080E
Sonya and Matrix Beauty
strings
2400
x952
1076A
Minimizing the String
greedy
,
strings
1200
x12966
1073A
Diverse Substring
implementation
,
strings
1000
x15192
1065G
Fibonacci Suffix
strings
2700
x244
1065E
Side Transmutations
combinatorics
,
strings
2300
x1041
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10291
1056H
Detect Robots
data structures
,
strings
3200
x154
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2196
1055F
Tree and XOR
strings
,
trees
2900
x453
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x619
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x916
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8355
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x169
1045I
Palindrome Pairs
hashing
,
strings
1600
x4285
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x223
1038F
Wrap Around
dp
,
strings
2900
x300
1038A
Equality
implementation
,
strings
800
x14774
1037C
Equalize
dp
,
greedy
,
strings
1300
x18498
1029A
Many Equal Substrings
implementation
,
strings
1300
x12156
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