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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
45:09:42
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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
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Name
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x59998
279B
Books
binary search
,
brute force
,
implementation
,
two pointers
1400
x47525
489B
BerSU Ball
dfs and similar
,
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
1200
x46358
1791C
Prepend and Append
implementation
,
two pointers
800
x40262
1462A
Favorite Sequence
implementation
,
two pointers
800
x39814
1343C
Alternating Subsequence
dp
,
greedy
,
two pointers
1200
x36243
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34489
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32870
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32438
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x32403
1354B
Ternary String
binary search
,
dp
,
implementation
,
two pointers
1200
x29073
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x27974
1843B
Long Long
greedy
,
math
,
two pointers
800
x27939
1399C
Boats Competition
brute force
,
greedy
,
two pointers
1200
x27708
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x27304
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27040
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x26897
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26739
1324D
Pair of Topics
binary search
,
data structures
,
sortings
,
two pointers
1400
x26641
1690D
Black and White Stripe
implementation
,
two pointers
1000
x26637
580B
Kefa and Company
binary search
,
sortings
,
two pointers
1500
x24843
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24427
978C
Letters
binary search
,
implementation
,
two pointers
1000
x24298
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24073
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x22914
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22272
1374D
Zero Remainder Array
math
,
sortings
,
two pointers
1400
x22141
1547C
Pair Programming
greedy
,
two pointers
1100
x21988
1133C
Balanced Team
sortings
,
two pointers
1200
x21232
1470A
Strange Birthday Party
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1300
x21185
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21167
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20846
1006C
Three Parts of the Array
binary search
,
data structures
,
two pointers
1200
x20149
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x19996
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19846
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x19828
1366B
Shuffle
math
,
two pointers
1300
x19551
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19511
1352E
Special Elements
brute force
,
implementation
,
two pointers
1500
x19220
961B
Lecture Sleep
data structures
,
dp
,
implementation
,
two pointers
1200
x19134
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19032
1369C
RationalLee
greedy
,
math
,
sortings
,
two pointers
1400
x19007
1251A
Broken Keyboard
brute force
,
strings
,
two pointers
1000
x18776
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x18745
1364B
Most socially-distanced subsequence
greedy
,
two pointers
1300
x18388
1389C
Good String
brute force
,
dp
,
greedy
,
two pointers
1500
x18324
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18063
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18032
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18001
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x17971
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17592
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17386
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17160
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16714
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16548
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16365
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16057
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15837
1304C
Air Conditioner
dp
,
greedy
,
implementation
,
sortings
,
two pointers
1500
x15749
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15747
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15745
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x15674
1257C
Dominated Subarray
greedy
,
implementation
,
sortings
,
strings
,
two pointers
1200
x15540
1492C
Maximum width
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1500
x15538
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15174
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15082
1610B
Kalindrome Array
greedy
,
two pointers
1100
x14709
1419D2
Sage's Birthday (hard version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x14681
1237B
Balanced Tunnel
data structures
,
sortings
,
two pointers
1300
x14649
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14543
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14463
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x14451
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14266
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13917
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13787
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x13699
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x13654
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13438
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13294
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13291
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13283
1462E1
Close Tuples (easy version)
binary search
,
combinatorics
,
math
,
sortings
,
two pointers
1500
x13171
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13141
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x12982
6C
Alice, Bob and Chocolate
greedy
,
two pointers
1200
x12961
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x12950
427C
Checkposts
dfs and similar
,
graphs
,
two pointers
1700
x12909
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12846
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12764
1381A2
Prefix Flip (Hard Version)
constructive algorithms
,
data structures
,
implementation
,
strings
,
two pointers
1700
x12737
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12712
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12487
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12404
372A
Counting Kangaroos is Fun
binary search
,
greedy
,
sortings
,
two pointers
1600
x12316
1265B
Beautiful Numbers
data structures
,
implementation
,
math
,
two pointers
1300
x12285
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12242
446A
DZY Loves Sequences
dp
,
implementation
,
two pointers
1600
x12228
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12222
1343D
Constant Palindrome Sum
brute force
,
data structures
,
greedy
,
two pointers
1700
x12183
1333C
Eugene and an array
binary search
,
data structures
,
implementation
,
two pointers
1700
x12100
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