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Codeforces Round (Div. 2)
3 days
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Difficulty:
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two pointers
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
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x14364
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x13680
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x15463
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12967
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x21738
1968B
Prefiquence
greedy
,
two pointers
800
x26616
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x14439
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14968
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x16486
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13342
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x20011
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20958
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x11914
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x14205
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x19758
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x14208
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12364
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x10192
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14814
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x34167
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11186
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28866
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19663
1843B
Long Long
greedy
,
math
,
two pointers
800
x28636
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33748
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x26361
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33542
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20919
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x18348
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x14126
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x13224
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x19314
1791C
Prepend and Append
implementation
,
two pointers
800
x43122
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x16022
1776H
Beppa and SwerChat
two pointers
1300
x6224
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x13752
1760D
Challenging Valleys
implementation
,
two pointers
1000
x23154
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x17028
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x25954
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17556
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14805
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x19948
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x13184
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x13056
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x16418
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x14169
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x16949
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x21075
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x22235
1690D
Black and White Stripe
implementation
,
two pointers
1000
x28313
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16511
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x16342
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x24648
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x18328
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x21043
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15446
1610B
Kalindrome Array
greedy
,
two pointers
1100
x15417
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9633
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20476
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x15120
1547C
Pair Programming
greedy
,
two pointers
1100
x22415
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27844
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16318
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21910
1462A
Favorite Sequence
implementation
,
two pointers
800
x40981
1431B
Polycarp and the Language of Gods
*special problem
,
implementation
,
two pointers
1400
x1006
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x28358
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x23197
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19427
1366B
Shuffle
math
,
two pointers
1300
x20384
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x19387
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x27654
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27567
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x30162
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x37702
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x27663
1305B
Kuroni and Simple Strings
constructive algorithms
,
greedy
,
strings
,
two pointers
1200
x11674
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12527
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15831
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x19378
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x15485
1225B2
TV Subscriptions (Hard Version)
implementation
,
two pointers
1300
x10401
1190A
Tokitsukaze and Discard Items
implementation
,
two pointers
1400
x9307
1133C
Balanced Team
sortings
,
two pointers
1200
x22063
1107C
Brutality
greedy
,
sortings
,
two pointers
1300
x9879
1007A
Reorder the Array
combinatorics
,
data structures
,
math
,
sortings
,
two pointers
1300
x12069
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20730
978C
Letters
binary search
,
implementation
,
two pointers
1000
x25081
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x20203
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9090
892B
Wrath
greedy
,
implementation
,
two pointers
1200
x8807
888C
K-Dominant Character
binary search
,
implementation
,
two pointers
1400
x8157
842A
Kirill And The Game
brute force
,
two pointers
1200
x10074
769B
News About Credit
*special problem
,
greedy
,
two pointers
1200
x3268
762B
USB vs. PS/2
greedy
,
implementation
,
sortings
,
two pointers
1400
x7877
716B
Complete the Word
greedy
,
two pointers
1300
x11982
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10648
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x28671
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x47781
430B
Balls Game
brute force
,
two pointers
1400
x3665
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