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Codeforces Round 964 (Div. 4)
02:39:10
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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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Status
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Custom test
Problems
#
Name
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5270
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x497
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7626
1284A
New Year and Naming
implementation
,
strings
800
x17961
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2223
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x16445
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1928
1270F
Awesome Substrings
math
,
strings
2600
x1125
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8511
1267L
Lexicography
constructive algorithms
,
strings
1800
x3013
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15843
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3271
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x334
1251B
Binary Palindromes
greedy
,
strings
1400
x10937
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x19387
1243B2
Character Swap (Hard Version)
strings
1600
x7064
1243B1
Character Swap (Easy Version)
strings
1000
x14781
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x5926
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x829
1223B
Strings Equalization
strings
1000
x14676
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10141
1220A
Cards
implementation
,
sortings
,
strings
800
x29411
1219C
Periodic integer number
implementation
,
strings
1700
x1769
1216A
Prefixes
strings
800
x18538
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2546
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x122
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1119
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x994
1205E
Expected Value Again
combinatorics
,
strings
3100
x274
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x3215
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x3049
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x2033
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5063
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2513
1201A
Important Exam
implementation
,
strings
900
x15488
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7410
1194C
From S To T
implementation
,
strings
1300
x13076
1189A
Keanu Reeves
strings
800
x15174
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x12128
1185B
Email from Polycarp
implementation
,
strings
1200
x13262
1183H
Subsequences (hard version)
dp
,
strings
1900
x3109
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4403
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x11079
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6247
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4291
1178B
WOW Factor
dp
,
strings
1300
x14845
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x788
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x19169
1163D
Mysterious Code
dp
,
strings
2100
x1242
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2215
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6183
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x14406
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7368
1151A
Maxim and Biology
brute force
,
strings
1000
x11159
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1884
1147B
Chladni Figure
brute force
,
strings
1900
x2833
1146B
Hate "A"
implementation
,
strings
1100
x8491
1146A
Love "A"
implementation
,
strings
800
x21699
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4113
1144A
Diverse Strings
implementation
,
strings
800
x19071
1140B
Good String
implementation
,
strings
1200
x11259
1139A
Even Substrings
implementation
,
strings
800
x16716
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x4009
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6041
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1132
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x912
1120C
Compress String
dp
,
strings
2100
x2087
1111A
Superhero Transformation
implementation
,
strings
1000
x16774
1110H
Modest Substrings
dp
,
strings
3500
x279
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4305
1107A
Digits Sequence Dividing
greedy
,
strings
900
x11994
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9867
1102D
Balanced Ternary String
greedy
,
strings
1500
x7919
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
x10494
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16380
1092C
Prefixes and Suffixes
strings
1700
x5864
1090J
Two Prefixes
strings
2600
x427
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x1048
1085A
Right-Left Cipher
implementation
,
strings
800
x12104
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1892
1082F
Speed Dial
dp
,
strings
,
trees
2800
x415
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x103
1080E
Sonya and Matrix Beauty
strings
2400
x1084
1076A
Minimizing the String
greedy
,
strings
1200
x13002
1073A
Diverse Substring
implementation
,
strings
1000
x15268
1065G
Fibonacci Suffix
strings
2700
x250
1065E
Side Transmutations
combinatorics
,
strings
2300
x1041
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10299
1056H
Detect Robots
data structures
,
strings
3200
x155
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2209
1055F
Tree and XOR
strings
,
trees
2900
x458
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x619
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x932
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8376
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x169
1045I
Palindrome Pairs
hashing
,
strings
1600
x4308
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x225
1038F
Wrap Around
dp
,
strings
2900
x318
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