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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
44:00:36
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Difficulty:
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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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Problems
#
Name
4C
Registration System
data structures
,
hashing
,
implementation
1300
x75687
1520D
Same Differences
data structures
,
hashing
,
math
1200
x41660
2A
Winner
hashing
,
implementation
1500
x24513
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21322
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17496
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x16687
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16092
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15117
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13734
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x13714
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13436
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x12997
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12073
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x11837
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11740
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11533
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10420
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10286
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x9809
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9606
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9411
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9149
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8773
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8474
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8319
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x7907
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7755
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7551
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7379
1225D
Power Products
hashing
,
math
,
number theory
1800
x7299
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6762
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6415
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6114
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x5807
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5778
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5621
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5202
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4958
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4913
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4913
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4786
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4692
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4302
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4235
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4109
1045I
Palindrome Pairs
hashing
,
strings
1600
x3958
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3937
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3886
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3861
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3695
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3613
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3535
7D
Palindrome Degree
hashing
,
strings
2200
x3461
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2909
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2858
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2777
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2765
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x2699
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2692
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2641
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2618
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2564
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2551
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2492
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2437
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2339
757C
Felicity is Coming!
data structures
,
hashing
,
sortings
,
strings
1900
x2302
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2229
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2154
25E
Test
hashing
,
strings
2200
x2124
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2093
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2070
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2046
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2030
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2011
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2007
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1963
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1943
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1922
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x1917
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1915
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1885
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1835
963D
Frequency of String
hashing
,
string suffix structures
,
strings
2500
x1787
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1785
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1772
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1739
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1709
985F
Isomorphic Strings
hashing
,
strings
2300
x1689
710F
String Set Queries
brute force
,
data structures
,
hashing
,
interactive
,
string suffix structures
,
strings
2400
x1650
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1645
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1591
877F
Ann and Books
data structures
,
flows
,
hashing
2300
x1577
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1528
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1505
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1500
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1485
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1459
869E
The Untended Antiquity
data structures
,
hashing
2400
x1444
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1414
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