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Codeforces Round 941 (Div. 1)
3 days
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Codeforces Round 941 (Div. 2)
3 days
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→ Filter Problems
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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
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2665
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x419
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x728
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1043
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1093
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1187
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1250
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1601
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1803
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1914
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2015
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2091
25E
Test
hashing
,
strings
2200
x2164
7D
Palindrome Degree
hashing
,
strings
2200
x3493
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4963
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1429
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1963
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1979
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2046
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2351
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2452
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2637
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2798
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2911
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4729
228C
Fractal Detector
dp
,
hashing
2000
x441
958A2
Death Stars (medium)
hashing
,
strings
2000
x874
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1269
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2510
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2558
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2706
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2815
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3118
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3924
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4331
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6443
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6838
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2306
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2594
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2960
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3210
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3666
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3711
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3886
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3971
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4830
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4927
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4963
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6136
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8348
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x737
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1714
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2103
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2169
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4249
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x5914
1225D
Power Products
hashing
,
math
,
number theory
1800
x7362
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x7979
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8526
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9495
316G1
Good Substrings
hashing
,
strings
1700
x926
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2015
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3583
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5259
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5854
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8884
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9244
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10346
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11816
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17680
1045I
Palindrome Pairs
hashing
,
strings
1600
x4056
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4130
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5764
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7472
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9758
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12208
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13081
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2781
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7591
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10811
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11581
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13510
2A
Winner
hashing
,
implementation
1500
x24786
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7790
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10025
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15185
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12076
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13790
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x16895
4C
Registration System
data structures
,
hashing
,
implementation
1300
x76659
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16332
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21578
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42342
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x13820
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