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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
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2614
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
x13912
1725A
Accumulation of Dominoes
math
800
x9230
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x11315
1722F
L-shapes
dfs and similar
,
implementation
1700
x6942
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10834
1722D
Line
greedy
,
sortings
1100
x23225
1722C
Word Game
data structures
,
implementation
800
x30923
1722B
Colourblindness
implementation
800
x46033
1722A
Spell Check
implementation
800
x50497
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
x16801
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x21184
1720A
Burenka Plays with Fractions
math
,
number theory
900
x22390
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
x25529
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
x14660
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
1716B
Permutation Chain
constructive algorithms
,
math
800
x21411
1716A
2-3 Moves
greedy
,
math
800
x32791
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x524
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1724
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x5144
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8636
1715B
Beautiful Array
constructive algorithms
,
greedy
,
math
1000
x21883
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23541
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7597
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3237
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x16571
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x9080
1714C
Minimum Varied Number
greedy
800
x30992
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x30274
1714A
Everyone Loves to Sleep
implementation
,
math
900
x29666
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x536
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1684
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5681
1713C
Build Permutation
constructive algorithms
,
dp
,
math
1200
x17375
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x21287
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x21988
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x313
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1267
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2155
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4489
1712C
Sort Zero
greedy
,
sortings
1100
x19811
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21572
1712A
Wonderful Permutation
greedy
,
implementation
800
x24057
1711B
Party
brute force
,
graphs
1300
x13405
1711A
Perfect Permutation
constructive algorithms
800
x25151
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x505
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x420
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1369
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2461
1710A
Color the Picture
constructive algorithms
,
greedy
,
math
1500
x10897
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x549
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2713
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8408
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x8864
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x22738
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29611
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x20704
1708A
Difference Operations
greedy
,
math
800
x21768
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x152
1707E
Replace
binary search
,
data structures
3500
x621
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x619
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1503
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5735
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x13582
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2660
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1704
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6949
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x14892
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