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Before contest
Codeforces Round 941 (Div. 1)
35:06:36
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Before contest
Codeforces Round 941 (Div. 2)
35:06:36
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→ Filter Problems
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
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x5999
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2451
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5550
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6676
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2586
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2050
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x18736
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x407
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6821
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1533
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x12948
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5707
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12841
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1179
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2036
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1649
1701D
Permutation Restoration
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1900
x5468
1701C
Schedule Management
binary search
,
greedy
,
implementation
,
two pointers
1400
x15661
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1075
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1567
1697C
awoo's Favorite Problem
binary search
,
constructive algorithms
,
data structures
,
greedy
,
implementation
,
strings
,
two pointers
1400
x13913
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x152
1693F
I Might Be Wrong
binary search
,
greedy
,
two pointers
3400
x274
1692G
2^Sort
data structures
,
dp
,
sortings
,
two pointers
1400
x15825
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x19806
1691D
Max GEQ Sum
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
implementation
,
two pointers
1800
x5453
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21153
1690E
Price Maximization
binary search
,
greedy
,
math
,
two pointers
1500
x14447
1690D
Black and White Stripe
implementation
,
two pointers
1000
x26616
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16361
1684F
Diverse Segments
data structures
,
two pointers
2600
x841
1684E
MEX vs DIFF
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
2100
x3029
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x285
1680C
Binary String
binary search
,
greedy
,
strings
,
two pointers
1600
x9467
1676F
Longest Strike
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x15740
1672D
Cyclic Rotation
constructive algorithms
,
greedy
,
implementation
,
two pointers
1700
x5972
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x22886
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1421
1660D
Maximum Product Strikes Back
brute force
,
implementation
,
math
,
two pointers
1600
x8091
1659D
Reverse Sort Sum
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
,
two pointers
1900
x3859
1656B
Subtract Operation
data structures
,
greedy
,
math
,
two pointers
1100
x17583
1646B
Quality vs Quantity
brute force
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
800
x20842
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1040
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x189
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4452
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2823
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5489
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15172
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2219
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10587
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3869
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1065
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6162
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6914
1610B
Kalindrome Array
greedy
,
two pointers
1100
x14697
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x727
1609C
Complex Market Analysis
binary search
,
dp
,
implementation
,
number theory
,
schedules
,
two pointers
1400
x9469
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6407
1607H
Banquet Preparations 2
greedy
,
sortings
,
two pointers
2200
x1187
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x995
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4758
1600E
Array Game
games
,
greedy
,
two pointers
1900
x1911
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x633
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x19991
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1542
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x266
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1709
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14253
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1736
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4239
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7685
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2521
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4596
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x304
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3853
1553D
Backspace
dp
,
greedy
,
strings
,
two pointers
1500
x13287
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1438
1550D
Excellent Arrays
binary search
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
sortings
,
two pointers
2300
x1779
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9250
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5480
1547E
Air Conditioners
data structures
,
dp
,
implementation
,
shortest paths
,
sortings
,
two pointers
1500
x13782
1547C
Pair Programming
greedy
,
two pointers
1100
x21974
1539D
PriceFixed
binary search
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x11257
1538C
Number of Pairs
binary search
,
data structures
,
math
,
two pointers
1300
x26879
1537E2
Erase and Extend (Hard Version)
binary search
,
data structures
,
greedy
,
hashing
,
string suffix structures
,
strings
,
two pointers
2200
x4964
1537E1
Erase and Extend (Easy Version)
binary search
,
brute force
,
dp
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
1600
x12214
1535C
Unstable String
binary search
,
dp
,
greedy
,
implementation
,
strings
,
two pointers
1400
x16049
1525E
Assimilation IV
combinatorics
,
dp
,
math
,
probabilities
,
two pointers
2100
x1937
1519D
Maximum Sum of Products
brute force
,
dp
,
implementation
,
math
,
two pointers
1600
x14534
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x945
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4079
1515D
Phoenix and Socks
greedy
,
sortings
,
two pointers
1500
x11139
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x580
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x698
1508A
Binary Literature
constructive algorithms
,
greedy
,
implementation
,
strings
,
two pointers
1900
x5981
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x967
1503C
Travelling Salesman Problem
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
sortings
,
two pointers
2200
x3195
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x410
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x763
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1557
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