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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
Register now »
*has extra registration
→ Filter Problems
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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Status
Standings
Custom test
Problems
#
Name
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3882
144C
Anagram Search
implementation
,
strings
1500
x3879
412C
Pattern
implementation
,
strings
1200
x3845
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3795
61B
Hard Work
strings
1300
x3778
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3755
260B
Ancient Prophesy
brute force
,
implementation
,
strings
1600
x3733
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3706
1902E
Collapsing Strings
data structures
,
strings
,
trees
1900
x3689
358B
Dima and Text Messages
brute force
,
strings
1500
x3674
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3659
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3622
1930D1
Sum over all Substrings (Easy Version)
brute force
,
dp
,
greedy
,
strings
1800
x3616
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3569
147A
Punctuation
implementation
,
strings
1300
x3543
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3505
7D
Palindrome Degree
hashing
,
strings
2200
x3488
91A
Newspaper Headline
greedy
,
strings
1500
x3446
278B
New Problem
brute force
,
strings
1500
x3415
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3412
928A
Login Verification
*special problem
,
strings
1200
x3330
1336C
Kaavi and Magic Spell
dp
,
strings
2200
x3323
346B
Lucky Common Subsequence
dp
,
strings
2000
x3309
75B
Facetook Priority Wall
expression parsing
,
implementation
,
strings
1500
x3194
682D
Alyona and Strings
dp
,
strings
1900
x3169
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3147
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3138
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3101
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3083
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3071
1256F
Equalizing Two Strings
constructive algorithms
,
sortings
,
strings
2000
x3045
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3039
291B
Command Line Arguments
*special problem
,
implementation
,
strings
1300
x3010
1204D2
Kirk and a Binary String (hard version)
data structures
,
greedy
,
math
,
strings
2100
x2969
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2911
1183H
Subsequences (hard version)
dp
,
strings
1900
x2892
1530E
Minimax
constructive algorithms
,
greedy
,
strings
2100
x2889
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2848
1204D1
Kirk and a Binary String (easy version)
brute force
,
greedy
,
strings
2000
x2847
1267L
Lexicography
constructive algorithms
,
strings
1800
x2845
780D
Innokenty and a Football League
2-sat
,
graphs
,
greedy
,
implementation
,
shortest paths
,
strings
1900
x2838
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2794
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2777
629C
Famil Door and Brackets
dp
,
strings
2000
x2731
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2730
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2705
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2680
1147B
Chladni Figure
brute force
,
strings
1900
x2667
930B
Game with String
implementation
,
probabilities
,
strings
1600
x2584
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2583
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2582
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2580
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2579
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2578
494B
Obsessive String
dp
,
strings
2000
x2561
1303E
Erase Subsequences
dp
,
strings
2200
x2532
121B
Lucky Transformation
strings
1500
x2522
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2513
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2507
691C
Exponential notation
implementation
,
strings
1800
x2473
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2455
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2450
1411D
Grime Zoo
brute force
,
greedy
,
implementation
,
strings
2100
x2420
808G
Anthem of Berland
dp
,
strings
2300
x2385
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2382
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2373
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2350
1202C
You Are Given a WASD-string...
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
strings
2100
x2345
1526D
Kill Anton
brute force
,
constructive algorithms
,
data structures
,
math
,
strings
2200
x2343
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2319
1213F
Unstable String Sort
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
2100
x2311
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2305
533B
Work Group
dfs and similar
,
dp
,
graphs
,
strings
,
trees
2000
x2297
615C
Running Track
dp
,
greedy
,
strings
,
trees
2000
x2251
724D
Dense Subsequence
data structures
,
greedy
,
strings
1900
x2243
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2237
113A
Grammar Lessons
implementation
,
strings
1600
x2229
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x2218
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2165
25E
Test
hashing
,
strings
2200
x2159
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2088
427D
Match & Catch
dp
,
string suffix structures
,
strings
2200
x2081
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2053
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2042
1282D
Enchanted Artifact
constructive algorithms
,
interactive
,
strings
2300
x2032
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2015
1578H
Higher Order Functions
implementation
,
strings
1700
x1987
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1972
235C
Cyclical Quest
data structures
,
string suffix structures
,
strings
2700
x1971
727B
Bill Total Value
expression parsing
,
implementation
,
strings
1600
x1964
149E
Martian Strings
string suffix structures
,
strings
2300
x1964
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1959
250B
Restoring IPv6
implementation
,
strings
1500
x1944
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1938
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1937
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1931
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1928
638B
Making Genome in Berland
*special problem
,
dfs and similar
,
strings
1500
x1925
883E
Field of Wonders
implementation
,
strings
1500
x1875
81B
Sequence Formatting
implementation
,
strings
1700
x1871
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