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May 23, 4:00 (UTC)
to
May 23, 8:00 (UTC)
due to technical maintenance.
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Custom test
Problems
#
Name
1841B
Keep it Beautiful
implementation
1000
x20652
1841A
Game with Board
constructive algorithms
,
games
800
x24265
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x902
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2241
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1714
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7591
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x12941
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24834
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21584
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32744
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1163
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2185
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11410
1839B
Lamps
greedy
,
sortings
1100
x14518
1839A
The Good Array
greedy
,
implementation
,
math
800
x17118
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x302
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1378
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3088
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13533
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x15862
1838A
Blackboard List
constructive algorithms
,
math
800
x21099
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2080
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2107
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13527
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21181
1837B
Comparison String
greedy
900
x26779
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x29349
1836B
Astrophysicists
greedy
,
math
1100
x12293
1836A
Destroyer
implementation
,
sortings
800
x19815
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x145
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x203
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x451
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x940
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x906
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7475
1834F
Typewriter
brute force
,
math
2500
x488
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2076
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4370
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12689
1834B
Maximum Strength
greedy
,
math
1000
x14584
1834A
Unit Array
greedy
,
math
800
x21460
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4966
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6762
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10416
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12749
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25572
1833B
Restore the Weather
greedy
,
sortings
900
x25486
1833A
Musical Puzzle
implementation
,
strings
800
x31675
1832F
Zombies
binary search
,
dp
3200
x253
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2063
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1801
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2805
1832C
Contrast Value
greedy
,
implementation
1200
x18415
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19801
1832A
New Palindrome
strings
800
x24944
1831B
Array merging
constructive algorithms
,
greedy
1000
x18642
1831A
Twin Permutations
constructive algorithms
800
x24414
1830F
The Third Grace
data structures
,
dp
3200
x223
1830E
Bully Sort
data structures
,
math
3500
x231
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x607
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1536
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4613
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12529
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7136
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9489
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16281
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18354
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24383
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27244
1829B
Blank Space
implementation
800
x41188
1829A
Love Story
implementation
,
strings
800
x46283
1828B
Permutation Swap
math
,
number theory
900
x20824
1828A
Divisible Array
constructive algorithms
,
math
800
x23058
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x108
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x363
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x707
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1150
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1777
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3673
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17565
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x339
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1510
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8663
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12861
1826B
Lunatic Never Content
math
,
number theory
1100
x15904
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14557
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14216
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19311
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x124
1824D
LuoTianyi and the Function
data structures
3000
x453
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1260
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2502
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4351
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10858
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x793
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1199
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3667
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11720
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15372
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15832
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number theory
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