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Problems
#
Name
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30917
1843B
Long Long
greedy
,
math
,
two pointers
800
x27896
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32821
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x107
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x555
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x914
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1234
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1522
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3897
1842C
Tenzing and Balls
dp
1500
x11538
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15521
1842A
Tenzing and Tsondu
games
,
math
800
x19403
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x468
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x1868
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4110
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7247
1841B
Keep it Beautiful
implementation
1000
x20409
1841A
Game with Board
constructive algorithms
,
games
800
x24159
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x889
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2209
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1686
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7470
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x12686
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24369
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21395
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32393
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1138
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2163
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11324
1839B
Lamps
greedy
,
sortings
1100
x14438
1839A
The Good Array
greedy
,
implementation
,
math
800
x17056
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x290
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1353
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3049
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13352
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x15772
1838A
Blackboard List
constructive algorithms
,
math
800
x21008
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2050
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2089
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13226
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21027
1837B
Comparison String
greedy
900
x26305
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x28894
1836B
Astrophysicists
greedy
,
math
1100
x12240
1836A
Destroyer
implementation
,
sortings
800
x19736
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x137
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x199
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x441
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x931
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x893
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7390
1834F
Typewriter
brute force
,
math
2500
x487
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2038
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4323
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12561
1834B
Maximum Strength
greedy
,
math
1000
x14450
1834A
Unit Array
greedy
,
math
800
x20956
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4886
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6608
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10162
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12628
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25440
1833B
Restore the Weather
greedy
,
sortings
900
x25273
1833A
Musical Puzzle
implementation
,
strings
800
x31445
1832F
Zombies
binary search
,
dp
3200
x250
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2048
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1781
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2777
1832C
Contrast Value
greedy
,
implementation
1200
x18074
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19460
1832A
New Palindrome
strings
800
x24672
1831B
Array merging
constructive algorithms
,
greedy
1000
x18309
1831A
Twin Permutations
constructive algorithms
800
x23987
1830F
The Third Grace
data structures
,
dp
3200
x219
1830E
Bully Sort
data structures
,
math
3500
x225
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x590
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1502
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4563
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12329
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x6983
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9302
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16027
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18059
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24025
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x26945
1829B
Blank Space
implementation
800
x40319
1829A
Love Story
implementation
,
strings
800
x45351
1828B
Permutation Swap
math
,
number theory
900
x20467
1828A
Divisible Array
constructive algorithms
,
math
800
x22841
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x105
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x355
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x694
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1119
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1751
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3636
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17355
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x336
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1492
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8460
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12721
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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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