Enter
|
Register
Home
Top
Catalog
Contests
Gym
Problemset
Groups
Rating
Edu
API
Calendar
Help
→ Pay attention
Before contest
Codeforces Round 941 (Div. 1)
2 days
Register now »
*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
2 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
hashing
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
Add tag
Main
acmsguru
|
Problems
Submit
Status
Standings
Custom test
Problems
#
Name
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x896
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4251
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x97
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1967
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x866
1045I
Palindrome Pairs
hashing
,
strings
1600
x4061
1045B
Space Isaac
hashing
,
number theory
2400
x487
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x807
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1093
985F
Isomorphic Strings
hashing
,
strings
2300
x1694
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1797
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x648
958A2
Death Stars (medium)
hashing
,
strings
2000
x875
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1252
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1121
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1603
869E
The Untended Antiquity
data structures
,
hashing
2400
x1465
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x314
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3887
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1314
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x747
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x756
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x849
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x514
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2351
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2306
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4130
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1112
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2104
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x382
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1665
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x78
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1185
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1187
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2558
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2598
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1981
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x453
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2510
607C
Marbles
hashing
,
strings
2500
x777
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1088
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1934
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7591
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1601
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10347
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x494
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3711
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x438
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x341
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x861
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2169
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2091
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x13823
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x521
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6444
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x859
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2015
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x16899
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1761
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8350
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1362
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x748
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1386
407D
Largest Submatrix 3
dp
,
hashing
2700
x539
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x400
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x254
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x606
316G1
Good Substrings
hashing
,
strings
1700
x926
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1269
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x5918
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x7982
228C
Fractal Detector
dp
,
hashing
2000
x441
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x763
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x321
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x503
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1429
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7794
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2665
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2452
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17684
119D
String Transformation
hashing
,
strings
2500
x473
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2706
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2016
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1714
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x419
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x737
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2784
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x672
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x582
25E
Test
hashing
,
strings
2200
x2165
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1043
7D
Palindrome Degree
hashing
,
strings
2200
x3495
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76699
2A
Winner
hashing
,
implementation
1500
x24799
←
1
2
→
User lists
Name