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Problems
#
Name
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7140
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22932
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7746
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x826
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1965
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x979
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2615
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x42173
1759A
Yes-Yes?
implementation
,
strings
800
x28963
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x24531
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x865
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1369
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x14422
1742F
Smaller
constructive algorithms
,
greedy
,
strings
1500
x10932
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x30003
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x516
1738H
Palindrome Addicts
data structures
,
strings
3300
x230
1737A
Ela Sorting Books
greedy
,
implementation
,
strings
900
x9976
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2409
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x9619
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2605
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2073
1729C
Jumping on Tiles
constructive algorithms
,
strings
1100
x19518
1729B
Decode String
greedy
,
strings
800
x29497
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1829
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1759
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5763
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8784
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x8572
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22613
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x99
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x24572
1703C
Cypher
brute force
,
implementation
,
strings
800
x34368
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x63730
1701E
Text Editor
brute force
,
dp
,
greedy
,
strings
2500
x1076
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x14010
1691C
Sum of Substrings
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1400
x15177
1690F
Shifting String
graphs
,
math
,
number theory
,
strings
1700
x6869
1688C
Manipulating History
constructive algorithms
,
greedy
,
strings
1700
x7945
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x3181
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23540
1682A
Palindromic Indices
greedy
,
strings
800
x19078
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9560
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1105
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x28983
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x10177
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x23004
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x14408
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x18253
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x12447
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x17061
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x205
1663F
In Every Generation...
*special problem
,
strings
x330
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x1699
1662B
Toys
greedy
,
strings
x132
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2614
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x7042
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x18890
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10672
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1061
1654B
Prefix Removals
strings
800
x15511
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x34010
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6038
1634A
Reverse and Concatenate
greedy
,
strings
800
x23672
1628B
Peculiar Movie Preferences
greedy
,
strings
1700
x11250
1626B
Minor Reduction
greedy
,
strings
1100
x22399
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3974
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x16355
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1079
1619A
Square String?
implementation
,
strings
800
x48902
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4066
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16118
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2395
1616B
Mirror in the String
greedy
,
strings
1100
x19154
1609B
William the Vigilant
implementation
,
strings
1100
x11533
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x151
1607A
Linear Keyboard
implementation
,
strings
800
x36249
1606A
AB Balance
strings
900
x23078
1605C
Dominant Character
brute force
,
greedy
,
implementation
,
strings
1400
x16446
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x326
1594C
Make Them Equal
brute force
,
greedy
,
math
,
strings
1200
x18146
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x856
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14614
1579A
Casimir's String Solitaire
math
,
strings
800
x37967
1578H
Higher Order Functions
implementation
,
strings
1700
x1996
1575H
Holiday Wall Ornaments
dp
,
strings
2200
x589
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4236
1567A
Domino Disaster
implementation
,
strings
800
x29719
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1342
1560E
Polycarp and String Transformation
binary search
,
implementation
,
sortings
,
strings
1800
x7705
1560D
Make a Power of Two
greedy
,
math
,
strings
1300
x17718
1555D
Say No to Palindromes
brute force
,
constructive algorithms
,
dp
,
strings
1600
x11823
1554D
Diane
constructive algorithms
,
greedy
,
strings
1800
x9139
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13385
1553B
Reverse String
brute force
,
dp
,
hashing
,
implementation
,
strings
1300
x13869
1552A
Subsequence Permutation
sortings
,
strings
800
x23561
1551C
Interesting Story
greedy
,
sortings
,
strings
1500
x12948
1551B1
Wonderful Coloring - 1
greedy
,
strings
800
x28733
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1451
1547B
Alphabetical Strings
greedy
,
implementation
,
strings
800
x26024
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43:45:43
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