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Codeforces Round (Div. 2)
4 days
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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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Custom test
Problems
#
Name
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2367
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1791
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x8034
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x13733
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x27656
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x22427
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33976
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1215
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2309
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11954
1839B
Lamps
greedy
,
sortings
1100
x15111
1839A
The Good Array
greedy
,
implementation
,
math
800
x17459
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x315
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1477
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3253
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x14432
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x16389
1838A
Blackboard List
constructive algorithms
,
math
800
x21492
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2192
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2180
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x14722
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21950
1837B
Comparison String
greedy
900
x29601
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x32366
1836B
Astrophysicists
greedy
,
math
1100
x12628
1836A
Destroyer
implementation
,
sortings
800
x20283
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x164
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x227
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x494
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x992
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x939
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7805
1834F
Typewriter
brute force
,
math
2500
x523
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2239
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4654
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x13265
1834B
Maximum Strength
greedy
,
math
1000
x15232
1834A
Unit Array
greedy
,
math
800
x24358
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x5367
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x7349
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x11729
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x13312
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x26083
1833B
Restore the Weather
greedy
,
sortings
900
x26467
1833A
Musical Puzzle
implementation
,
strings
800
x32579
1832F
Zombies
binary search
,
dp
3200
x269
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2165
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1899
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2931
1832C
Contrast Value
greedy
,
implementation
1200
x20701
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x21907
1832A
New Palindrome
strings
800
x25702
1831B
Array merging
constructive algorithms
,
greedy
1000
x20796
1831A
Twin Permutations
constructive algorithms
800
x26835
1830F
The Third Grace
data structures
,
dp
3200
x244
1830E
Bully Sort
data structures
,
math
3500
x243
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x676
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1656
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4879
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x13524
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7719
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x10409
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x17510
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x19977
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x26323
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x28488
1829B
Blank Space
implementation
800
x45718
1829A
Love Story
implementation
,
strings
800
x50548
1828B
Permutation Swap
math
,
number theory
900
x23049
1828A
Divisible Array
constructive algorithms
,
math
800
x23635
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x117
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x389
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x755
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1208
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1874
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3868
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x18995
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x380
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1597
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x9755
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13545
1826B
Lunatic Never Content
math
,
number theory
1100
x17619
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x15176
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14667
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19647
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x130
1824D
LuoTianyi and the Function
data structures
3000
x489
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1387
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2621
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4573
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x11290
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x876
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1242
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3830
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x12275
1823B
Sort with Step
brute force
,
math
,
sortings
900
x16018
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x16138
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2425
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x7034
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x6122
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