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Problems
#
Name
1729B
Decode String
greedy
,
strings
800
x29497
1729A
Two Elevators
math
800
x39152
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x429
1728F
Fishermen
flows
,
graph matchings
,
greedy
3100
x413
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1663
1728D
Letter Picking
constructive algorithms
,
dp
,
games
,
two pointers
1800
x6923
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15383
1728B
Best Permutation
constructive algorithms
,
greedy
800
x19944
1728A
Colored Balls: Revisited
brute force
,
greedy
,
implementation
,
sortings
800
x24398
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x81
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x286
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
1726E
Almost Perfect
combinatorics
,
fft
,
math
2400
x1362
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3563
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12112
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x14725
1726A
Mainak and Array
greedy
,
math
900
x20134
1725M
Moving Both Hands
dp
,
graphs
,
shortest paths
1800
x2880
1725L
Lemper Cooking Competition
data structures
2400
x882
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x588
1725J
Journey
dp
,
trees
2500
x362
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x189
1725H
Hot Black Hot White
constructive algorithms
,
math
1800
x2517
1725G
Garage
binary search
,
geometry
,
math
1500
x5646
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x942
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x437
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x119
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1550
1725B
Basketball Together
binary search
,
greedy
,
sortings
1000
x11966
1725A
Accumulation of Dominoes
math
800
x9088
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x10524
1722F
L-shapes
dfs and similar
,
implementation
1700
x6606
1722E
Counting Rectangles
brute force
,
data structures
,
dp
,
implementation
1600
x10173
1722D
Line
greedy
,
sortings
1100
x22413
1722C
Word Game
data structures
,
implementation
800
x29717
1722B
Colourblindness
implementation
800
x43608
1722A
Spell Check
implementation
800
x47522
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x372
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1829
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6360
1721C
Min-Max Array Transformation
binary search
,
greedy
,
two pointers
1400
x13027
1721B
Deadly Laser
implementation
1000
x21601
1721A
Image
greedy
,
implementation
800
x26673
1720E
Misha and Paintings
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
2700
x740
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1759
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5763
1720C
Corners
greedy
,
implementation
1200
x16385
1720B
Interesting Sum
brute force
,
data structures
,
greedy
,
math
,
sortings
800
x20805
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21847
1719C
Fighting Tournament
binary search
,
data structures
,
implementation
,
two pointers
1400
x12921
1719B
Mathematical Circus
constructive algorithms
,
math
800
x18319
1719A
Chip Game
games
,
math
800
x25060
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x146
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x105
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x290
1718C
Tonya and Burenka-179
data structures
,
greedy
,
math
,
number theory
2400
x1532
1718B
Fibonacci Strings
greedy
,
implementation
,
math
,
number theory
2000
x2896
1718A2
Burenka and Traditions (hard version)
data structures
,
dp
,
greedy
1900
x5034
1718A1
Burenka and Traditions (easy version)
dp
,
greedy
1800
x5534
1717F
Madoka and The First Session
constructive algorithms
,
flows
,
graph matchings
,
graphs
,
implementation
2500
x517
1717E
Madoka and The Best University
math
,
number theory
2200
x2506
1717D
Madoka and The Corruption Scheme
combinatorics
,
constructive algorithms
,
greedy
,
math
1900
x4274
1717C
Madoka and Formal Statement
greedy
1300
x14332
1717B
Madoka and Underground Competitions
constructive algorithms
,
implementation
1100
x14516
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19198
1716F
Bags with Balls
combinatorics
,
dp
,
math
,
number theory
2500
x1006
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1027
1716D
Chip Move
brute force
,
dp
,
math
2000
x5022
1716C
Robot in a Hallway
data structures
,
dp
,
greedy
,
implementation
,
ternary search
2000
x4032
1716B
Permutation Chain
constructive algorithms
,
math
800
x21231
1716A
2-3 Moves
greedy
,
math
800
x31641
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x504
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1621
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x4959
1715C
Monoblock
combinatorics
,
data structures
,
implementation
,
math
1700
x8396
1715B
Beautiful Array
constructive algorithms
,
greedy
,
math
1000
x20346
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x23249
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7211
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3100
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x15482
1714D
Color with Occurrences
brute force
,
data structures
,
dp
,
greedy
,
strings
1600
x8784
1714C
Minimum Varied Number
greedy
800
x30163
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x29483
1714A
Everyone Loves to Sleep
implementation
,
math
900
x28685
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x514
1713E
Cross Swapping
2-sat
,
data structures
,
dsu
,
greedy
,
matrices
2400
x1525
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5493
1713C
Build Permutation
constructive algorithms
,
dp
,
math
1200
x16889
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x20777
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x21699
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x306
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1185
1712E1
LCM Sum (easy version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
two pointers
2300
x2052
1712D
Empty Graph
binary search
,
constructive algorithms
,
data structures
,
greedy
,
shortest paths
2000
x4301
1712C
Sort Zero
greedy
,
sortings
1100
x19308
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21296
1712A
Wonderful Permutation
greedy
,
implementation
800
x23780
1711B
Party
brute force
,
graphs
1300
x13161
1711A
Perfect Permutation
constructive algorithms
800
x24859
1710E
Two Arrays
binary search
,
games
,
graph matchings
2400
x475
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combine-tags-by-or
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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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