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Codeforces Round (Div. 2)
3 days
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Difficulty:
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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
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x16285
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1915
1270F
Awesome Substrings
math
,
strings
2600
x1113
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8483
1267L
Lexicography
constructive algorithms
,
strings
1800
x3003
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15802
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3244
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x330
1251B
Binary Palindromes
greedy
,
strings
1400
x10916
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x19280
1243B2
Character Swap (Hard Version)
strings
1600
x7008
1243B1
Character Swap (Easy Version)
strings
1000
x14752
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x5899
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x825
1223B
Strings Equalization
strings
1000
x14634
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10106
1220A
Cards
implementation
,
sortings
,
strings
800
x29221
1219C
Periodic integer number
implementation
,
strings
1700
x1765
1216A
Prefixes
strings
800
x18467
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2525
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x120
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1114
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x982
1205E
Expected Value Again
combinatorics
,
strings
3100
x273
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x3062
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2910
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1986
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5046
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2499
1201A
Important Exam
implementation
,
strings
900
x15429
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7204
1194C
From S To T
implementation
,
strings
1300
x13006
1189A
Keanu Reeves
strings
800
x15145
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x12098
1185B
Email from Polycarp
implementation
,
strings
1200
x13124
1183H
Subsequences (hard version)
dp
,
strings
1900
x3093
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4391
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x11035
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6228
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4274
1178B
WOW Factor
dp
,
strings
1300
x14434
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x786
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x19074
1163D
Mysterious Code
dp
,
strings
2100
x1228
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2207
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6160
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x14100
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7342
1151A
Maxim and Biology
brute force
,
strings
1000
x11057
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1876
1147B
Chladni Figure
brute force
,
strings
1900
x2825
1146B
Hate "A"
implementation
,
strings
1100
x8449
1146A
Love "A"
implementation
,
strings
800
x21619
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4086
1144A
Diverse Strings
implementation
,
strings
800
x18946
1140B
Good String
implementation
,
strings
1200
x11237
1139A
Even Substrings
implementation
,
strings
800
x16522
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3950
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5955
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1128
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x906
1120C
Compress String
dp
,
strings
2100
x2077
1111A
Superhero Transformation
implementation
,
strings
1000
x16674
1110H
Modest Substrings
dp
,
strings
3500
x278
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4285
1107A
Digits Sequence Dividing
greedy
,
strings
900
x11951
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9836
1102D
Balanced Ternary String
greedy
,
strings
1500
x7885
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
x10443
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16328
1092C
Prefixes and Suffixes
strings
1700
x5830
1090J
Two Prefixes
strings
2600
x421
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x917
1085A
Right-Left Cipher
implementation
,
strings
800
x12089
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1883
1082F
Speed Dial
dp
,
strings
,
trees
2800
x414
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x100
1080E
Sonya and Matrix Beauty
strings
2400
x948
1076A
Minimizing the String
greedy
,
strings
1200
x12908
1073A
Diverse Substring
implementation
,
strings
1000
x15134
1065G
Fibonacci Suffix
strings
2700
x243
1065E
Side Transmutations
combinatorics
,
strings
2300
x1037
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10273
1056H
Detect Robots
data structures
,
strings
3200
x153
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2060
1055F
Tree and XOR
strings
,
trees
2900
x452
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x618
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x911
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8346
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x166
1045I
Palindrome Pairs
hashing
,
strings
1600
x4250
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x220
1038F
Wrap Around
dp
,
strings
2900
x299
1038A
Equality
implementation
,
strings
800
x14696
1037C
Equalize
dp
,
greedy
,
strings
1300
x18459
1029A
Many Equal Substrings
implementation
,
strings
1300
x12115
1027A
Palindromic Twist
implementation
,
strings
1000
x15867
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8600
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