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Before contest
Codeforces Round (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
strings
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
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Status
Standings
Custom test
Problems
#
Name
1833A
Musical Puzzle
implementation
,
strings
800
x24673
1832A
New Palindrome
strings
800
x19117
1829A
Love Story
implementation
,
strings
800
x28154
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x659
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x15271
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x2694
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x6425
1821E
Rearrange Brackets
brute force
,
dp
,
greedy
,
sortings
,
strings
2100
x1551
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x9816
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x10051
1820A
Yura's New Name
implementation
,
strings
800
x13528
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x86
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x171
1811A
Insert Digit
greedy
,
math
,
strings
800
x24369
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x23924
1805B
The String Has a Target
greedy
,
strings
800
x16025
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x129
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x2715
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x9033
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x9277
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x15890
1800B
Count the Number of Pairs
greedy
,
strings
1000
x19419
1800A
Is It a Cat?
implementation
,
strings
800
x24054
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x4285
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x13813
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x16778
1795A
Two Towers
brute force
,
implementation
,
strings
800
x21133
1794A
Prefix and Suffix Array
strings
800
x14601
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x20789
1791A
Codeforces Checking
implementation
,
strings
800
x39953
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x30363
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x359
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x13951
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x5796
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x21597
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x6284
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x599
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1503
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x673
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2125
1760B
Atilla's Favorite Problem
greedy
,
implementation
,
strings
800
x33691
1759A
Yes-Yes?
implementation
,
strings
800
x24648
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x22010
1750F
Majority
combinatorics
,
dp
,
math
,
strings
2700
x545
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1149
1748B
Diverse Substrings
brute force
,
implementation
,
strings
1400
x12091
1742F
Smaller
constructive algorithms
,
greedy
,
strings
1500
x8553
1741A
Compare T-Shirt Sizes
implementation
,
implementation
,
strings
800
x26455
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x414
1738H
Palindrome Addicts
data structures
,
strings
3300
x159
1737A
Ela Sorting Books
greedy
,
implementation
,
strings
900
x9235
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2103
1735C
Phase Shift
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
strings
1400
x8410
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2336
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x1770
1729C
Jumping on Tiles
constructive algorithms
,
strings
1100
x17162
1729B
Decode String
greedy
,
strings
800
x26588
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1530
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1513
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5021
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x7361
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x7607
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x21553
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x79
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x20510
1703C
Cypher
brute force
,
implementation
,
strings
800
x29949
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x45977
1701E
Text Editor
brute force
,
dp
,
greedy
,
strings
2500
x974
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x12486
1691C
Sum of Substrings
brute force
,
constructive algorithms
,
greedy
,
math
,
strings
1400
x13582
1690F
Shifting String
graphs
,
math
,
number theory
,
strings
1700
x5863
1688C
Manipulating History
constructive algorithms
,
greedy
,
strings
1700
x7211
1685B
Linguistics
greedy
,
implementation
,
sortings
,
strings
2000
x2816
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x22160
1682A
Palindromic Indices
greedy
,
strings
800
x18250
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x8200
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x949
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x25126
1675E
Replace With the Previous, Minimize
dsu
,
greedy
,
strings
1500
x8666
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x20365
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x13136
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x17528
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x11613
1669E
2-Letter Strings
data structures
,
math
,
strings
1200
x14125
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x179
1663F
In Every Generation...
*special problem
,
strings
x300
1662D
Evolution of Weasels
greedy
,
implementation
,
strings
x1346
1662B
Toys
greedy
,
strings
x119
1660F2
Promising String (hard version)
data structures
,
implementation
,
math
,
strings
2100
x2296
1660F1
Promising String (easy version)
brute force
,
implementation
,
math
,
strings
1700
x6270
1660C
Get an Even String
dp
,
greedy
,
strings
1300
x16608
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x9634
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x870
1654B
Prefix Removals
strings
800
x14971
1650A
Deletions of Two Adjacent Letters
implementation
,
strings
800
x31013
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5305
1634A
Reverse and Concatenate
greedy
,
strings
800
x22698
1628B
Peculiar Movie Preferences
greedy
,
strings
1700
x10157
1626B
Minor Reduction
greedy
,
strings
1100
x20538
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3506
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