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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
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number theory
probabilities
schedules
shortest paths
sortings
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strings
ternary search
trees
two pointers
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Problems
#
Name
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x8917
1895C
Torn Lucky Ticket
brute force
,
dp
,
hashing
,
implementation
,
math
1400
x8271
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1249
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x351
1849C
Binary String Copying
binary search
,
brute force
,
data structures
,
hashing
,
strings
1600
x8718
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x6832
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1375
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1035
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x381
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1763
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3262
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x19310
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x920
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5504
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x589
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x686
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x872
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1367
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x227
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5019
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x8273
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x1948
1729F
Kirei and the Linear Function
hashing
,
math
1900
x3796
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1674
1704D
Magical Array
constructive algorithms
,
hashing
,
implementation
,
math
1900
x4680
1681D
Required Length
brute force
,
dfs and similar
,
dp
,
hashing
,
shortest paths
1700
x8715
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2532
1658E
Gojou and Matrix Game
data structures
,
dp
,
games
,
hashing
,
implementation
,
math
,
number theory
,
sortings
2500
x940
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x937
1650C
Weight of the System of Nested Segments
greedy
,
hashing
,
implementation
,
sortings
1200
x15616
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x965
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1442
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3754
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x559
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x102
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x293
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x128
1599F
Mars
hashing
2700
x269
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x296
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4209
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x203
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x757
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x924
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13448
1538E
Funny Substrings
data structures
,
hashing
,
implementation
,
matrices
,
strings
2100
x2695
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4719
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x11593
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x12995
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x408
1533D
String Searching
*special problem
,
hashing
x427
1527C
Sequence Pair Weight
hashing
,
implementation
,
math
1600
x12583
1520D
Same Differences
data structures
,
hashing
,
math
1200
x37993
1500A
Going Home
brute force
,
hashing
,
implementation
,
math
1800
x8285
1494E
A-Z Graph
constructive algorithms
,
data structures
,
graphs
,
hashing
2400
x1596
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4532
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x476
1476E
Pattern Matching
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
hashing
,
sortings
,
strings
2300
x2159
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x5981
1469E
A Bit Similar
bitmasks
,
brute force
,
hashing
,
string suffix structures
,
strings
,
two pointers
2400
x1777
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3456
1466G
Song of the Sirens
combinatorics
,
divide and conquer
,
hashing
,
math
,
string suffix structures
,
strings
2600
x804
1451C
String Equality
dp
,
greedy
,
hashing
,
implementation
,
strings
1400
x14687
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1287
1394B
Boboniu Walks on Graph
brute force
,
dfs and similar
,
graphs
,
hashing
2300
x1735
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x302
1393E1
Twilight and Ancient Scroll (easier version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x327
1360F
Spy-string
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
hashing
,
strings
1700
x11482
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x390
1326D2
Prefix-Suffix Palindrome (Hard version)
binary search
,
greedy
,
hashing
,
string suffix structures
,
strings
1800
x9149
1326D1
Prefix-Suffix Palindrome (Easy version)
hashing
,
string suffix structures
,
strings
1500
x11341
1322C
Instant Noodles
graphs
,
hashing
,
math
,
number theory
2300
x1969
1320D
Reachable Strings
data structures
,
hashing
,
strings
2500
x1136
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x473
1286C2
Madhouse (Hard version)
brute force
,
constructive algorithms
,
hashing
,
interactive
,
math
2800
x570
1284D
New Year and Conference
binary search
,
data structures
,
hashing
,
sortings
2100
x2811
1277D
Let's Play the Words?
data structures
,
hashing
,
implementation
,
math
1900
x2876
1257F
Make Them Similar
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
2400
x1802
1252F
Regular Forestation
hashing
,
trees
2400
x777
1228D
Complete Tripartite
brute force
,
constructive algorithms
,
graphs
,
hashing
,
implementation
1900
x4870
1225D
Power Products
hashing
,
math
,
number theory
1800
x6937
1223F
Stack Exterminable Arrays
data structures
,
divide and conquer
,
dp
,
hashing
2600
x1827
1214D
Treasure Island
dfs and similar
,
dp
,
flows
,
hashing
1900
x4787
1207G
Indie Album
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
2700
x835
1200E
Compress Words
brute force
,
hashing
,
implementation
,
string suffix structures
,
strings
2000
x6366
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x750
1175F
The Number of Subpermutations
brute force
,
data structures
,
divide and conquer
,
hashing
,
math
2500
x1394
1166F
Vicky's Delivery Service
data structures
,
dsu
,
graphs
,
hashing
2400
x664
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x110
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5221
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10013
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x856
1109B
Sasha and One More Name
constructive algorithms
,
hashing
,
strings
1800
x4190
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x95
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x1826
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x831
1045I
Palindrome Pairs
hashing
,
strings
1600
x3766
1045B
Space Isaac
hashing
,
number theory
2400
x468
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x203
1017E
The Supersonic Rocket
geometry
,
hashing
,
strings
2400
x730
1003F
Abbreviation
dp
,
hashing
,
strings
2200
x1029
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