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Before contest
Codeforces Round 941 (Div. 1)
13:00:06
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
13:00:07
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→ Filter Problems
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
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Status
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Custom test
Problems
#
Name
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7988
452A
Eevee
brute force
,
implementation
,
strings
1000
x7890
1688C
Manipulating History
constructive algorithms
,
greedy
,
strings
1700
x7878
1102D
Balanced Ternary String
greedy
,
strings
1500
x7807
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7804
518B
Tanya and Postcard
greedy
,
implementation
,
strings
1400
x7793
544A
Set of Strings
implementation
,
strings
1100
x7720
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x7639
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7626
1446B
Catching Cheaters
dp
,
strings
1800
x7519
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x7402
318B
Strings of Power
implementation
,
strings
,
two pointers
1300
x7365
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7325
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7271
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7262
729A
Interview with Oleg
implementation
,
strings
900
x7253
632C
The Smallest String Concatenation
sortings
,
strings
1700
x7183
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7098
954B
String Typing
implementation
,
strings
1400
x7095
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7015
765B
Code obfuscation
greedy
,
implementation
,
strings
1100
x7015
612A
The Text Splitting
brute force
,
implementation
,
strings
1300
x7009
989B
A Tide of Riverscape
constructive algorithms
,
strings
1200
x6970
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x6962
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6846
1243B2
Character Swap (Hard Version)
strings
1600
x6845
1690F
Shifting String
graphs
,
math
,
number theory
,
strings
1700
x6769
802G
Fake News (easy)
implementation
,
strings
800
x6689
505A
Mr. Kitayuta's Gift
brute force
,
implementation
,
strings
1100
x6588
99A
Help Far Away Kingdom
strings
800
x6505
608B
Hamming Distance Sum
combinatorics
,
strings
1500
x6467
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6448
722B
Verse Pattern
implementation
,
strings
1200
x6342
814C
An impassioned circulation of affection
brute force
,
dp
,
strings
,
two pointers
1600
x6292
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6271
1912L
LOL Lovers
strings
800
x6243
797C
Minimal string
data structures
,
greedy
,
strings
1700
x6240
151B
Phone Numbers
implementation
,
strings
1200
x6211
66A
Petya and Java
implementation
,
strings
1300
x6198
1181B
Split a Number
greedy
,
implementation
,
strings
1500
x6172
1430E
String Reversal
data structures
,
greedy
,
strings
1900
x6146
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6126
584C
Marina and Vasya
constructive algorithms
,
greedy
,
strings
1700
x6062
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5988
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x5981
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x5924
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5814
464A
No to Palindromes!
greedy
,
strings
1700
x5810
1812J
Unmysterious Language
*special problem
,
constructive algorithms
,
strings
x5783
1092C
Prefixes and Suffixes
strings
1700
x5767
1238D
AB-string
binary search
,
combinatorics
,
dp
,
strings
1900
x5727
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5709
697B
Barnicle
brute force
,
implementation
,
math
,
strings
1400
x5662
628C
Bear and String Distance
greedy
,
strings
1300
x5654
455B
A Lot of Games
dfs and similar
,
dp
,
games
,
implementation
,
strings
,
trees
1900
x5641
600C
Make Palindrome
constructive algorithms
,
greedy
,
strings
1800
x5626
940C
Phone Numbers
constructive algorithms
,
implementation
,
strings
1500
x5601
558E
A Simple Task
data structures
,
sortings
,
strings
2300
x5559
5B
Center Alignment
implementation
,
strings
1200
x5530
50B
Choosing Symbol Pairs
strings
1500
x5525
8A
Train and Peter
strings
1200
x5486
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5438
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5287
748B
Santa Claus and Keyboard Check
implementation
,
strings
1500
x5269
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5268
90B
African Crossword
implementation
,
strings
1100
x5144
898C
Phone Numbers
implementation
,
strings
1400
x5127
245B
Internet Address
implementation
,
strings
1100
x5118
1426F
Number of Subsequences
combinatorics
,
dp
,
strings
2000
x5089
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4966
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4910
777D
Cloud of Hashtags
binary search
,
greedy
,
implementation
,
strings
1800
x4909
1290B
Irreducible Anagrams
binary search
,
constructive algorithms
,
data structures
,
strings
,
two pointers
1800
x4906
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4875
1202D
Print a 1337-string...
combinatorics
,
constructive algorithms
,
math
,
strings
1900
x4863
600A
Extract Numbers
implementation
,
strings
1600
x4846
312A
Whose sentence is it?
implementation
,
strings
1100
x4846
691B
s-palindrome
implementation
,
strings
1600
x4698
1493C
K-beautiful Strings
binary search
,
brute force
,
constructive algorithms
,
greedy
,
strings
2000
x4451
1182C
Beautiful Lyrics
data structures
,
greedy
,
strings
1700
x4379
832B
Petya and Exam
implementation
,
strings
1600
x4326
766C
Mahmoud and a Message
brute force
,
dp
,
greedy
,
strings
1700
x4311
1409F
Subsequences of Length Two
dp
,
strings
2100
x4265
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4251
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4247
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4214
1416C
XOR Inverse
bitmasks
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
sortings
,
strings
,
trees
2000
x4162
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4146
1178E
Archaeology
brute force
,
constructive algorithms
,
greedy
,
strings
1900
x4113
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4097
1506G
Maximize the Remaining String
brute force
,
data structures
,
dp
,
greedy
,
strings
2000
x4091
906A
Shockers
implementation
,
strings
1600
x4088
520C
DNA Alignment
math
,
strings
1500
x4082
1045I
Palindrome Pairs
hashing
,
strings
1600
x4064
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4062
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4016
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3999
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x3964
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3936
827A
String Reconstruction
data structures
,
greedy
,
sortings
,
strings
1700
x3936
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