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Codeforces Round (Div. 2)
46:07:47
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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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Problems
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Custom test
Problems
#
Name
1027A
Palindromic Twist
implementation
,
strings
1000
x15919
1023A
Single Wildcard Pattern Matching
brute force
,
implementation
,
strings
1200
x8611
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x1010
1015F
Bracket Substring
dp
,
strings
2300
x1078
1012D
AB-Strings
constructive algorithms
,
strings
2800
x319
1008A
Romaji
implementation
,
strings
900
x14899
1005B
Delete from the Left
brute force
,
implementation
,
strings
900
x22880
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1327
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x7015
989A
A Blend of Springtime
implementation
,
strings
900
x10238
988B
Substrings Sort
sortings
,
strings
1100
x18199
985F
Isomorphic Strings
hashing
,
strings
2300
x1796
981A
Antipalindrome
brute force
,
implementation
,
strings
900
x9210
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1744
978B
File Name
greedy
,
strings
800
x35608
977B
Two-gram
implementation
,
strings
900
x38017
975A
Aramic script
implementation
,
strings
900
x9101
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1417
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1882
958A2
Death Stars (medium)
hashing
,
strings
2000
x884
955D
Scissors
brute force
,
strings
2600
x462
954B
String Typing
implementation
,
strings
1400
x7131
946C
String Transformation
greedy
,
strings
1300
x8805
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5737
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7203
936C
Lock Puzzle
constructive algorithms
,
implementation
,
strings
2300
x1159
932G
Palindrome Partition
dp
,
string suffix structures
,
strings
2900
x904
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2632
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x804
928A
Login Verification
*special problem
,
strings
1200
x3362
923D
Picking Strings
constructive algorithms
,
implementation
,
strings
2500
x1176
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4211
918B
Radio Station
implementation
,
strings
900
x16001
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x125
914F
Substrings in a String
bitmasks
,
brute force
,
data structures
,
string suffix structures
,
strings
3000
x1555
906E
Reverses
dp
,
string suffix structures
,
strings
3300
x437
906A
Shockers
implementation
,
strings
1600
x4112
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1451
900E
Maximum Questions
data structures
,
dp
,
strings
2100
x1218
899F
Letters Removing
data structures
,
strings
2100
x1792
898C
Phone Numbers
implementation
,
strings
1400
x5214
895D
String Mark
combinatorics
,
math
,
strings
2100
x1099
883H
Palindromic Cut
brute force
,
implementation
,
strings
1800
x1597
883E
Field of Wonders
implementation
,
strings
1500
x1888
877A
Alex and broken contest
implementation
,
strings
1100
x10799
873F
Forbidden Indices
dsu
,
string suffix structures
,
strings
2400
x1319
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x897
868A
Bark to Unlock
brute force
,
implementation
,
strings
900
x8590
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x9017
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x199
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x483
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x20643
844A
Diversity
greedy
,
implementation
,
strings
1000
x10535
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x4017
832B
Petya and Exam
implementation
,
strings
1600
x4358
831B
Keyboard Layouts
implementation
,
strings
800
x14191
827E
Rusty String
fft
,
math
,
strings
2700
x860
827C
DNA Evolution
data structures
,
strings
2100
x1626
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x3975
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1389
822B
Crossword solving
brute force
,
implementation
,
strings
1000
x9434
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6399
808G
Anthem of Berland
dp
,
strings
2300
x2527
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x436
802G
Fake News (easy)
implementation
,
strings
800
x6827
801B
Valued Keys
constructive algorithms
,
greedy
,
strings
900
x10146
798B
Mike and strings
brute force
,
dp
,
strings
1300
x8316
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x21323
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6451
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x139
785A
Anton and Polyhedrons
implementation
,
strings
800
x85358
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2853
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x872
778A
String Game
binary search
,
greedy
,
strings
1700
x11315
777D
Cloud of Hashtags
binary search
,
greedy
,
implementation
,
strings
1800
x4959
776A
A Serial Killer
brute force
,
implementation
,
strings
900
x11936
774K
Stepan and Vowels
*special problem
,
implementation
,
strings
1600
x1261
766C
Mahmoud and a Message
brute force
,
dp
,
greedy
,
strings
1700
x4356
766A
Mahmoud and Longest Uncommon Subsequence
constructive algorithms
,
strings
1000
x29643
765B
Code obfuscation
greedy
,
implementation
,
strings
1100
x7067
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2410
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2695
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2323
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x11058
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x486
754C
Vladik and chat
brute force
,
constructive algorithms
,
dp
,
implementation
,
strings
2200
x916
748B
Santa Claus and Keyboard Check
implementation
,
strings
1500
x5302
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1948
747B
Mammoth's Genome Decoding
implementation
,
strings
900
x8664
746B
Decoding
implementation
,
strings
900
x27051
745A
Hongcow Learns the Cyclic Shift
implementation
,
strings
900
x10368
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x134
735A
Ostap and Grasshopper
implementation
,
strings
800
x12370
734A
Anton and Danik
implementation
,
strings
800
x145376
731A
Night at the Museum
implementation
,
strings
800
x44384
729A
Interview with Oleg
implementation
,
strings
900
x7359
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1160
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1980
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2615
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2276
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