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Before contest
Codeforces Round (Div. 3)
4 days
→ Filter Problems
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
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x16316
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1918
1270F
Awesome Substrings
math
,
strings
2600
x1115
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8484
1267L
Lexicography
constructive algorithms
,
strings
1800
x3003
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15805
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3245
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x330
1251B
Binary Palindromes
greedy
,
strings
1400
x10921
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x19304
1243B2
Character Swap (Hard Version)
strings
1600
x7010
1243B1
Character Swap (Easy Version)
strings
1000
x14755
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x5905
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x825
1223B
Strings Equalization
strings
1000
x14638
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10107
1220A
Cards
implementation
,
sortings
,
strings
800
x29235
1219C
Periodic integer number
implementation
,
strings
1700
x1768
1216A
Prefixes
strings
800
x18478
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2527
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
x984
1205E
Expected Value Again
combinatorics
,
strings
3100
x273
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x3065
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2911
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1989
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5049
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2503
1201A
Important Exam
implementation
,
strings
900
x15434
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7219
1194C
From S To T
implementation
,
strings
1300
x13012
1189A
Keanu Reeves
strings
800
x15146
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x12099
1185B
Email from Polycarp
implementation
,
strings
1200
x13158
1183H
Subsequences (hard version)
dp
,
strings
1900
x3094
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4392
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x11039
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6231
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4276
1178B
WOW Factor
dp
,
strings
1300
x14459
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x786
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x19086
1163D
Mysterious Code
dp
,
strings
2100
x1228
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2208
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6160
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x14133
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7343
1151A
Maxim and Biology
brute force
,
strings
1000
x11069
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1876
1147B
Chladni Figure
brute force
,
strings
1900
x2825
1146B
Hate "A"
implementation
,
strings
1100
x8452
1146A
Love "A"
implementation
,
strings
800
x21632
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4088
1144A
Diverse Strings
implementation
,
strings
800
x18953
1140B
Good String
implementation
,
strings
1200
x11241
1139A
Even Substrings
implementation
,
strings
800
x16525
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3950
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5961
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
x2078
1111A
Superhero Transformation
implementation
,
strings
1000
x16690
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
x11972
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9839
1102D
Balanced Ternary String
greedy
,
strings
1500
x7886
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
x10452
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16336
1092C
Prefixes and Suffixes
strings
1700
x5833
1090J
Two Prefixes
strings
2600
x421
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x917
1085A
Right-Left Cipher
implementation
,
strings
800
x12091
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1884
1082F
Speed Dial
dp
,
strings
,
trees
2800
x414
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x100
1080E
Sonya and Matrix Beauty
strings
2400
x949
1076A
Minimizing the String
greedy
,
strings
1200
x12915
1073A
Diverse Substring
implementation
,
strings
1000
x15141
1065G
Fibonacci Suffix
strings
2700
x243
1065E
Side Transmutations
combinatorics
,
strings
2300
x1038
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10280
1056H
Detect Robots
data structures
,
strings
3200
x153
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2118
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
x912
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8347
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x166
1045I
Palindrome Pairs
hashing
,
strings
1600
x4261
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
x14700
1037C
Equalize
dp
,
greedy
,
strings
1300
x18467
1029A
Many Equal Substrings
implementation
,
strings
1300
x12124
1027A
Palindromic Twist
implementation
,
strings
1000
x15880
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8602
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