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Before contest
Codeforces Round 941 (Div. 1)
13:20:53
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Before contest
Codeforces Round 941 (Div. 2)
13:20:53
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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
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number theory
probabilities
schedules
shortest paths
sortings
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ternary search
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Custom test
Problems
#
Name
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x13831
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42398
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21594
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16340
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76749
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x16903
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13791
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12105
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15190
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10036
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7803
2A
Winner
hashing
,
implementation
1500
x24817
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13516
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11583
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10886
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7596
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2784
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13087
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12220
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9774
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7486
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5814
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4130
1045I
Palindrome Pairs
hashing
,
strings
1600
x4064
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17685
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11822
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10352
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9250
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8894
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5859
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5263
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3585
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2017
316G1
Good Substrings
hashing
,
strings
1700
x926
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9503
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8528
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x7988
1225D
Power Products
hashing
,
math
,
number theory
1800
x7365
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x5923
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4251
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2169
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2104
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1714
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x737
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8353
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6139
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4963
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4929
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4834
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3976
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3887
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3713
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3671
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3265
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2961
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2598
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2306
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6846
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6448
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4344
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3927
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3138
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2859
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2709
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2558
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2510
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1269
958A2
Death Stars (medium)
hashing
,
strings
2000
x875
228C
Fractal Detector
dp
,
hashing
2000
x441
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4732
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2911
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2798
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2639
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2452
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2352
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2051
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1983
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1970
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1429
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4966
7D
Palindrome Degree
hashing
,
strings
2200
x3496
25E
Test
hashing
,
strings
2200
x2166
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2092
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2015
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1919
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1805
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1602
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1253
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1187
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1093
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1043
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x729
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x419
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2666
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2239
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2105
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1787
985F
Isomorphic Strings
hashing
,
strings
2300
x1694
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1603
425D
Sereja and Squares
binary search
,
data structures
,
hashing
2300
x1386
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