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Before contest
Codeforces Round (Div. 2)
7 days
→ Filter Problems
Difficulty:
—
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
1734A
Select Three Sticks
brute force
,
greedy
,
sortings
800
x21150
1733E
Conveyor
constructive algorithms
,
dp
,
math
2700
x1227
1733D2
Zero-One (Hard Version)
dp
,
greedy
2000
x4186
1733D1
Zero-One (Easy Version)
constructive algorithms
,
greedy
,
math
1400
x13466
1733C
Parity Shuffle Sorting
constructive algorithms
,
sortings
1300
x15621
1733B
Rule of League
constructive algorithms
,
math
900
x19694
1733A
Consecutive Sum
greedy
,
sortings
800
x20906
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x457
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1402
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8659
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2568
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5902
1732B
Ugu
brute force
,
dp
,
greedy
,
implementation
900
x15002
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14958
1731F
Function Sum
brute force
,
combinatorics
,
dp
,
fft
,
math
2500
x695
1731E
Graph Cost
dp
,
greedy
,
math
,
number theory
2000
x2824
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x7166
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x9540
1731B
Kill Demodogs
greedy
,
math
1100
x18271
1731A
Joey Takes Money
greedy
,
math
800
x22625
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x550
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x641
1730D
Prefixes and Suffixes
constructive algorithms
,
strings
,
two pointers
2200
x2666
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x16511
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x12666
1730A
Planets
data structures
,
greedy
,
sortings
800
x23008
1729G
Cut Substrings
combinatorics
,
dp
,
hashing
,
strings
,
two pointers
2100
x2188
1729F
Kirei and the Linear Function
hashing
,
math
1900
x4152
1729E
Guess the Cycle Size
interactive
,
probabilities
1800
x7004
1729D
Friends and the Restaurant
greedy
,
sortings
,
two pointers
1200
x20693
1729C
Jumping on Tiles
constructive algorithms
,
strings
1100
x19951
1729B
Decode String
greedy
,
strings
800
x30120
1729A
Two Elevators
math
800
x40414
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x464
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x428
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1734
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x7239
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15894
1728B
Best Permutation
constructive algorithms
,
greedy
800
x20137
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24629
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x86
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x290
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1422
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3682
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12343
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x15155
1726A
Mainak and Array
greedy
,
math
900
x21852
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x3129
1725L
Lemper Cooking Competition
data structures
2400
x912
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x672
1725J
Journey
dp
,
trees
2500
x377
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x199
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2613
1725G
Garage
binary search
,
geometry
,
math
1500
x5878
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x988
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x465
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x127
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1622
1725B
Basketball Together
binary search
,
greedy
,
sortings
1000
x13909
1725A
Accumulation of Dominoes
math
800
x9230
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x11313
1722F
L-shapes
dfs and similar
,
implementation
1700
x6941
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10831
1722D
Line
greedy
,
sortings
1100
x23225
1722C
Word Game
data structures
,
implementation
800
x30923
1722B
Colourblindness
implementation
800
x46023
1722A
Spell Check
implementation
800
x50496
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x400
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1978
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6626
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x13376
1721B
Deadly Laser
implementation
1000
x22218
1721A
Image
greedy
,
implementation
800
x27012
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x803
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1845
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5995
1720C
Corners
greedy
,
implementation
1200
x16799
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x21183
1720A
Burenka Plays with Fractions
math
,
number theory
900
x22389
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x13240
1719B
Mathematical Circus
constructive algorithms
,
math
800
x18536
1719A
Chip Game
games
,
math
800
x25527
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x153
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x109
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x304
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1613
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x3005
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x5231
1718A1
Burenka and Traditions (easy version)
dp
,
greedy
1800
x5762
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x529
1717E
Madoka and The Best University
math
,
number theory
2200
x2721
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4408
1717C
Madoka and Formal Statement
greedy
1300
x14659
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14781
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19470
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x1050
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1093
1716D
Chip Move
brute force
,
dp
,
math
2000
x5269
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4188
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