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Codeforces Round 986 (Div. 2)
09:32:39
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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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Problems
#
Name
1316B
String Modification
brute force
,
constructive algorithms
,
implementation
,
sortings
,
strings
1400
x11293
1315B
Homecoming
binary search
,
dp
,
greedy
,
strings
1300
x9218
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x553
1310C
Au Pont Rouge
binary search
,
dp
,
strings
2800
x528
1307C
Cow and Message
brute force
,
dp
,
math
,
strings
1500
x11872
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11791
1304B
Longest Palindrome
brute force
,
constructive algorithms
,
greedy
,
implementation
,
strings
1100
x17938
1303E
Erase Subsequences
dp
,
strings
2200
x2833
1303A
Erasing Zeroes
implementation
,
strings
800
x32518
1301C
Ayoub's function
binary search
,
combinatorics
,
greedy
,
math
,
strings
1700
x9369
1301A
Three Strings
implementation
,
strings
800
x19425
1297H
Paint the String
*special problem
,
dp
,
strings
x44
1295C
Obtain The String
dp
,
greedy
,
strings
1600
x13000
1295B
Infinite Prefixes
math
,
strings
1700
x9341
1291A
Even But Not Even
greedy
,
math
,
strings
900
x19618
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x5493
1286E
Fedya the Potter Strikes Back
data structures
,
strings
3200
x520
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7790
1284A
New Year and Naming
implementation
,
strings
800
x18023
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2247
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x16815
1272F
Two Bracket Sequences
dp
,
strings
,
two pointers
2200
x1979
1270F
Awesome Substrings
math
,
strings
2600
x1150
1268A
Long Beautiful Integer
constructive algorithms
,
greedy
,
implementation
,
strings
1700
x8672
1267L
Lexicography
constructive algorithms
,
strings
1800
x3105
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x16038
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3333
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x344
1251B
Binary Palindromes
greedy
,
strings
1400
x11026
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x19723
1243B2
Character Swap (Hard Version)
strings
1600
x7109
1243B1
Character Swap (Easy Version)
strings
1000
x14911
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x6063
1231E
Middle-Out
constructive algorithms
,
greedy
,
strings
2200
x840
1223B
Strings Equalization
strings
1000
x14970
1220C
Substring Game in the Lesson
games
,
greedy
,
strings
1300
x10286
1220A
Cards
implementation
,
sortings
,
strings
800
x29946
1219C
Periodic integer number
implementation
,
strings
1700
x1792
1216A
Prefixes
strings
800
x18726
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2606
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x124
1209F
Koala and Notebook
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
strings
,
trees
2600
x1181
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x1037
1205E
Expected Value Again
combinatorics
,
strings
3100
x284
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x3252
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x3083
1202E
You Are Given Some Strings...
brute force
,
string suffix structures
,
strings
2400
x2143
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x5122
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2577
1201A
Important Exam
implementation
,
strings
900
x15730
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7778
1194C
From S To T
implementation
,
strings
1300
x13268
1189A
Keanu Reeves
strings
800
x15311
1187B
Letters Shop
binary search
,
implementation
,
strings
1300
x12297
1185B
Email from Polycarp
implementation
,
strings
1200
x13424
1183H
Subsequences (hard version)
dp
,
strings
1900
x3197
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4426
1182B
Plus from Picture
dfs and similar
,
implementation
,
strings
1300
x11171
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6320
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4336
1178B
WOW Factor
dp
,
strings
1300
x15520
1170C
Minus and Minus Give Plus
*special problem
,
implementation
,
strings
x798
1167A
Telephone Number
brute force
,
greedy
,
strings
800
x19372
1163D
Mysterious Code
dp
,
strings
2100
x1285
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2242
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6238
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x15314
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7430
1151A
Maxim and Biology
brute force
,
strings
1000
x11228
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1903
1147B
Chladni Figure
brute force
,
strings
1900
x2889
1146B
Hate "A"
implementation
,
strings
1100
x8615
1146A
Love "A"
implementation
,
strings
800
x21997
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4167
1144A
Diverse Strings
implementation
,
strings
800
x19333
1140B
Good String
implementation
,
strings
1200
x11349
1139A
Even Substrings
implementation
,
strings
800
x16821
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x4032
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6181
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1151
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x927
1120C
Compress String
dp
,
strings
2100
x2112
1111A
Superhero Transformation
implementation
,
strings
1000
x16901
1110H
Modest Substrings
dp
,
strings
3500
x283
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4362
1107A
Digits Sequence Dividing
greedy
,
strings
900
x12063
1105B
Zuhair and Strings
brute force
,
implementation
,
strings
1100
x9915
1102D
Balanced Ternary String
greedy
,
strings
1500
x8006
1098F
Ж-function
string suffix structures
,
strings
3500
x229
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x95
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x10625
1093B
Letters Rearranging
constructive algorithms
,
greedy
,
sortings
,
strings
900
x16580
1092C
Prefixes and Suffixes
strings
1700
x5949
1090J
Two Prefixes
strings
2600
x448
1085E
Vasya and Templates
greedy
,
implementation
,
strings
2300
x1066
1085A
Right-Left Cipher
implementation
,
strings
800
x12187
1083B
The Fair Nut and Strings
greedy
,
strings
2000
x1957
1082F
Speed Dial
dp
,
strings
,
trees
2800
x422
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x106
1080E
Sonya and Matrix Beauty
strings
2400
x1123
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