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2023 Post World Finals Online ICPC Challenge powered by Huawei
01:36:37
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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
#
Name
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x2137
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2240
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2673
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
x729
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1045
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1095
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1187
903E
Swapping Characters
brute force
,
hashing
,
implementation
,
strings
2200
x1253
567E
President and Roads
dfs and similar
,
graphs
,
hashing
,
shortest paths
2200
x1637
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1811
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1929
486E
LIS of Sequence
data structures
,
dp
,
greedy
,
hashing
,
math
2200
x2015
526D
Om Nom and Necklace
hashing
,
string suffix structures
,
strings
2200
x2097
25E
Test
hashing
,
strings
2200
x2176
7D
Palindrome Degree
hashing
,
strings
2200
x3509
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4977
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1432
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1976
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x1986
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2059
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2361
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2455
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2645
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2802
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2912
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4737
228C
Fractal Detector
dp
,
hashing
2000
x441
958A2
Death Stars (medium)
hashing
,
strings
2000
x875
291E
Tree-String Problem
*special problem
,
dfs and similar
,
hashing
,
strings
2000
x1270
611D
New Year and Ancient Prophecy
dp
,
hashing
,
strings
2000
x2512
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2561
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2720
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x2956
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3246
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3945
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4354
514C
Watto and Mechanism
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2000
x6472
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6866
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
x2620
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2961
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3392
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3687
535D
Tavas and Malekas
greedy
,
hashing
,
string suffix structures
,
strings
1900
x3749
835D
Palindromic characteristics
brute force
,
dp
,
hashing
,
strings
1900
x3902
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3992
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4855
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4933
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4969
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6145
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8368
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x737
79C
Beaver
data structures
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x1716
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2110
533E
Correcting Mistakes
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
,
two pointers
1800
x2170
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4264
245H
Queries for Number of Palindromes
dp
,
hashing
,
strings
1800
x5959
1225D
Power Products
hashing
,
math
,
number theory
1800
x7381
242C
King's Path
dfs and similar
,
graphs
,
hashing
,
shortest paths
1800
x8034
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8537
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9552
316G1
Good Substrings
hashing
,
strings
1700
x927
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2017
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3587
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5274
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5870
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8925
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x9264
559B
Equivalent Strings
divide and conquer
,
hashing
,
sortings
,
strings
1700
x10361
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11848
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x17752
1045I
Palindrome Pairs
hashing
,
strings
1600
x4092
733D
Kostya the Sculptor
data structures
,
hashing
1600
x4135
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5834
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7528
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x9818
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12242
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x13106
39J
Spelling Check
hashing
,
implementation
,
strings
1500
x2786
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7603
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10925
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11623
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13544
2A
Winner
hashing
,
implementation
1500
x25001
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7819
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x10081
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x15200
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12168
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13815
486B
OR in Matrix
greedy
,
hashing
,
implementation
1300
x16925
4C
Registration System
data structures
,
hashing
,
implementation
1300
x77137
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x16361
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21666
1520D
Same Differences
data structures
,
hashing
,
math
1200
x42568
525A
Vitaliy and Pie
greedy
,
hashing
,
strings
1100
x13856
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