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Codeforces Round (Div. 2)
3 days
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Difficulty:
—
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
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x4010
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1758
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22915
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x7070
1753F
Minecraft Series
brute force
,
two pointers
3500
x194
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16979
1744F
MEX vs MED
math
,
two pointers
2000
x2975
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x25484
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17425
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1490
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1260
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14738
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6146
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2491
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5689
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6902
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2616
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2103
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x19627
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x435
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6998
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1572
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x13111
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5824
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x13003
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1208
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2078
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1664
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5570
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x16230
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1108
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1595
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x14097
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x156
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x283
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x16673
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x20744
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5616
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21948
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x14784
1690D
Black and White Stripe
implementation
,
two pointers
1000
x27841
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16457
1684F
Diverse Segments
data structures
,
two pointers
2600
x853
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3086
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x302
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9678
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x16195
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x6110
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x24144
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1455
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8372
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3923
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x18103
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20984
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1069
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x214
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4527
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2883
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5591
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15368
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2275
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10733
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3920
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1098
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6298
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7074
1610B
Kalindrome Array
greedy
,
two pointers
1100
x15244
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x738
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9591
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6499
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1208
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1012
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4849
1600E
Array Game
games
,
greedy
,
two pointers
1900
x1979
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x637
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20348
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1561
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x273
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1747
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14910
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1767
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4321
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7743
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2567
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4691
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x313
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3924
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13478
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1470
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1798
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9488
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5646
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x14099
1547C
Pair Programming
greedy
,
two pointers
1100
x22253
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11423
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x27612
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x5065
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12532
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16245
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x2010
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