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Problems
#
Name
1722C
Word Game
data structures
,
implementation
800
x29576
1722B
Colourblindness
implementation
800
x43397
1722A
Spell Check
implementation
800
x47152
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x365
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1817
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6328
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x12994
1721B
Deadly Laser
implementation
1000
x21555
1721A
Image
greedy
,
implementation
800
x26628
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x739
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1732
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5737
1720C
Corners
greedy
,
implementation
1200
x16347
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20776
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21782
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12882
1719B
Mathematical Circus
constructive algorithms
,
math
800
x18304
1719A
Chip Game
games
,
math
800
x25038
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x104
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x288
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1521
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2887
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x5018
1718A1
Burenka and Traditions (easy version)
dp
,
greedy
1800
x5511
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x511
1717E
Madoka and The Best University
math
,
number theory
2200
x2484
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4263
1717C
Madoka and Formal Statement
greedy
1300
x14298
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14496
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19167
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x1001
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1022
1716D
Chip Move
brute force
,
dp
,
math
2000
x4999
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4017
1716B
Permutation Chain
constructive algorithms
,
math
800
x21201
1716A
2-3 Moves
greedy
,
math
800
x31486
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x503
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1611
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4933
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8356
1715B
Beautiful Array
constructive algorithms
,
greedy
,
math
1000
x20182
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23213
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7155
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3081
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x15339
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8734
1714C
Minimum Varied Number
greedy
800
x30030
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29386
1714A
Everyone Loves to Sleep
implementation
,
math
900
x28560
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x510
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1519
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5471
1713C
Build Permutation
constructive algorithms
,
dp
,
math
1200
x16851
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x20744
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x21675
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x305
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1183
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2045
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4278
1712C
Sort Zero
greedy
,
sortings
1100
x19259
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21273
1712A
Wonderful Permutation
greedy
,
implementation
800
x23759
1711B
Party
brute force
,
graphs
1300
x13134
1711A
Perfect Permutation
constructive algorithms
800
x24831
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x466
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x408
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1277
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2356
1710A
Color the Picture
constructive algorithms
,
greedy
,
math
1500
x10621
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x535
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2459
1709D
Rorororobot
binary search
,
data structures
,
greedy
,
math
1700
x8094
1709C
Recover an RBS
constructive algorithms
,
greedy
,
implementation
,
strings
1800
x8527
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x21889
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29066
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x19572
1708A
Difference Operations
greedy
,
math
800
x21492
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x144
1707E
Replace
binary search
,
data structures
3500
x561
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x584
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1396
1707B
Difference Array
brute force
,
data structures
,
implementation
,
sortings
1900
x5550
1707A
Doremy's IQ
binary search
,
constructive algorithms
,
greedy
,
implementation
1600
x12875
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2373
1706D2
Chopping Carrots (Hard Version)
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2400
x1653
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6681
1706C
Qpwoeirut And The City
dp
,
flows
,
greedy
,
implementation
1400
x14453
1706B
Making Towers
dp
,
greedy
,
math
1100
x16233
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x22579
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x574
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x1979
1705D
Mark and Lightbulbs
combinatorics
,
constructive algorithms
,
greedy
,
math
,
sortings
1800
x6112
1705C
Mark and His Unfinished Essay
brute force
,
implementation
1400
x12991
1705B
Mark the Dust Sweeper
constructive algorithms
,
greedy
,
implementation
900
x22235
1705A
Mark the Photographer
greedy
,
sortings
800
x24836
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x76
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x170
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x98
1704F
Colouring Game
constructive algorithms
,
dp
,
games
2600
x937
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binary search
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data structures
dfs and similar
divide and conquer
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dsu
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graph matchings
graphs
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interactive
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number theory
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strings
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