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Before contest
Codeforces Round (Div. 3)
7 days
→ 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
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Problems
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Status
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Custom test
Problems
#
Name
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x7129
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x809
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1604
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x688
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x125
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5933
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x11176
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x900
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4278
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x100
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2042
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x905
1045I
Palindrome Pairs
hashing
,
strings
1600
x4210
1045B
Space Isaac
hashing
,
number theory
2400
x503
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x217
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x860
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1166
985F
Isomorphic Strings
hashing
,
strings
2300
x1727
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1840
961F
k-substrings
binary search
,
hashing
,
string suffix structures
2700
x671
958A2
Death Stars (medium)
hashing
,
strings
2000
x879
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1314
898F
Restoring the Expression
brute force
,
hashing
,
math
2300
x1130
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1658
869E
The Untended Antiquity
data structures
,
hashing
2400
x1488
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x481
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x316
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3967
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1352
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x772
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x767
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x138
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x867
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x523
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2383
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2315
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4142
727E
Games on a CD
data structures
,
hashing
,
string suffix structures
,
strings
2300
x1146
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2123
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x392
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1706
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x81
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1244
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1190
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2576
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2688
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2005
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x456
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2523
607C
Marbles
hashing
,
strings
2500
x780
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1096
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1976
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7664
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1665
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10430
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x500
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3806
534F
Simplified Nonogram
bitmasks
,
dp
,
hashing
,
meet-in-the-middle
2400
x445
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x344
533F
Encoding
hashing
,
string suffix structures
,
strings
2400
x869
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2230
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2105
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x14039
524F
And Yet Another Bracket Sequence
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
2700
x523
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6568
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x877
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2160
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x17095
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1774
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8451
452F
Permutation
data structures
,
divide and conquer
,
hashing
2700
x1396
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x757
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1406
407D
Largest Submatrix 3
dp
,
hashing
2700
x544
356E
Xenia and String Problem
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
3000
x403
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x258
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x618
316G1
Good Substrings
hashing
,
strings
1700
x932
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1282
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x6090
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8154
228C
Fractal Detector
dp
,
hashing
2000
x446
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x774
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x323
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x522
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1451
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7856
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2707
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2475
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x18159
119D
String Transformation
hashing
,
strings
2500
x479
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2744
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2019
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1734
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x421
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x744
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2844
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x683
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x591
25E
Test
hashing
,
strings
2200
x2236
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