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Before contest
Codeforces Round 941 (Div. 1)
22:56:29
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Before contest
Codeforces Round 941 (Div. 2)
22:56:29
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→ Filter Problems
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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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Problems
#
Name
1220A
Cards
implementation
,
sortings
,
strings
800
x28780
1219C
Periodic integer number
implementation
,
strings
1700
x1752
1216A
Prefixes
strings
800
x18335
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2327
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x118
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1067
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x946
1205E
Expected Value Again
combinatorics
,
strings
3100
x262
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2971
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2848
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x1777
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x4862
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2351
1201A
Important Exam
implementation
,
strings
900
x15158
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6845
1194C
From S To T
implementation
,
strings
1300
x12766
1189A
Keanu Reeves
strings
800
x14941
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x11847
1185B
Email from Polycarp
implementation
,
strings
1200
x12861
1183H
Subsequences (hard version)
dp
,
strings
1900
x2898
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4379
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x10837
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6172
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4113
1178B
WOW Factor
dp
,
strings
1300
x13804
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x770
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x18739
1163D
Mysterious Code
dp
,
strings
2100
x1210
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2059
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6126
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x13417
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7262
1151A
Maxim and Biology
brute force
,
strings
1000
x10975
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1858
1147B
Chladni Figure
brute force
,
strings
1900
x2802
1146B
Hate "A"
implementation
,
strings
1100
x8318
1146A
Love "A"
implementation
,
strings
800
x21387
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3996
1144A
Diverse Strings
implementation
,
strings
800
x18682
1140B
Good String
implementation
,
strings
1200
x11134
1139A
Even Substrings
implementation
,
strings
800
x16450
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3936
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5812
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1118
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x896
1120C
Compress String
dp
,
strings
2100
x1869
1111A
Superhero Transformation
implementation
,
strings
1000
x16560
1110H
Modest Substrings
dp
,
strings
3500
x273
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4251
1107A
Digits Sequence Dividing
greedy
,
strings
900
x11869
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9785
1102D
Balanced Ternary String
greedy
,
strings
1500
x7807
1098F
Ж-function
string suffix structures
,
strings
3500
x216
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x92
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x10325
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16094
1092C
Prefixes and Suffixes
strings
1700
x5767
1090J
Two Prefixes
strings
2600
x411
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x855
1085A
Right-Left Cipher
implementation
,
strings
800
x11860
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1845
1082F
Speed Dial
dp
,
strings
,
trees
2800
x404
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x97
1080E
Sonya and Matrix Beauty
strings
2400
x886
1076A
Minimizing the String
greedy
,
strings
1200
x12824
1073A
Diverse Substring
implementation
,
strings
1000
x14848
1065G
Fibonacci Suffix
strings
2700
x239
1065E
Side Transmutations
combinatorics
,
strings
2300
x1017
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10207
1056H
Detect Robots
data structures
,
strings
3200
x144
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1969
1055F
Tree and XOR
strings
,
trees
2900
x446
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x615
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x867
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8307
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x161
1045I
Palindrome Pairs
hashing
,
strings
1600
x4064
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1038F
Wrap Around
dp
,
strings
2900
x290
1038A
Equality
implementation
,
strings
800
x14403
1037C
Equalize
dp
,
greedy
,
strings
1300
x18280
1029A
Many Equal Substrings
implementation
,
strings
1300
x11993
1027A
Palindromic Twist
implementation
,
strings
1000
x15518
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8505
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x807
1015F
Bracket Substring
dp
,
strings
2300
x1044
1012D
AB-Strings
constructive algorithms
,
strings
2800
x316
1008A
Romaji
implementation
,
strings
900
x14722
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x22253
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1093
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x6969
989A
A Blend of Springtime
implementation
,
strings
900
x10140
988B
Substrings Sort
sortings
,
strings
1100
x17808
985F
Isomorphic Strings
hashing
,
strings
2300
x1694
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9024
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1681
978B
File Name
greedy
,
strings
800
x34907
977B
Two-gram
implementation
,
strings
900
x36606
975A
Aramic script
implementation
,
strings
900
x8958
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1327
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