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Before contest
Codeforces Round (Div. 2)
6 days
→ Filter Problems
Difficulty:
—
combine-tags-by-or
*combine tags by OR
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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Problems
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Status
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Custom test
Problems
#
Name
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7740
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x13226
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x25714
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21904
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33256
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1180
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2229
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11582
1839B
Lamps
greedy
,
sortings
1100
x14719
1839A
The Good Array
greedy
,
implementation
,
math
800
x17227
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x305
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1395
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3128
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13808
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x16049
1838A
Blackboard List
constructive algorithms
,
math
800
x21239
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2104
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2124
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13900
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21436
1837B
Comparison String
greedy
900
x27588
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x30314
1836B
Astrophysicists
greedy
,
math
1100
x12417
1836A
Destroyer
implementation
,
sortings
800
x20014
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x157
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x217
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x458
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x950
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x918
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7585
1834F
Typewriter
brute force
,
math
2500
x496
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2112
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4464
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12890
1834B
Maximum Strength
greedy
,
math
1000
x14803
1834A
Unit Array
greedy
,
math
800
x22476
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x5092
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6955
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10932
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12949
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25747
1833B
Restore the Weather
greedy
,
sortings
900
x25774
1833A
Musical Puzzle
implementation
,
strings
800
x31986
1832F
Zombies
binary search
,
dp
3200
x259
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2088
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1827
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2841
1832C
Contrast Value
greedy
,
implementation
1200
x19101
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20428
1832A
New Palindrome
strings
800
x25131
1831B
Array merging
constructive algorithms
,
greedy
1000
x19332
1831A
Twin Permutations
constructive algorithms
800
x25125
1830F
The Third Grace
data structures
,
dp
3200
x237
1830E
Bully Sort
data structures
,
math
3500
x234
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x618
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1568
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4701
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12826
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7330
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9759
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16639
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18930
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x25009
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27687
1829B
Blank Space
implementation
800
x42521
1829A
Love Story
implementation
,
strings
800
x47812
1828B
Permutation Swap
math
,
number theory
900
x21510
1828A
Divisible Array
constructive algorithms
,
math
800
x23232
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x111
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x370
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x716
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1162
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1797
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3734
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x18009
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x343
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1531
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x8968
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13058
1826B
Lunatic Never Content
math
,
number theory
1100
x16422
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14743
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14354
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19409
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x127
1824D
LuoTianyi and the Function
data structures
3000
x468
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1275
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2523
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4403
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10990
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x816
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1206
1823D
Unique Palindromes
constructive algorithms
,
math
,
strings
1900
x3724
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11882
1823B
Sort with Step
brute force
,
math
,
sortings
900
x15628
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15928
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2356
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6746
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5765
1822E
Making Anti-Palindromes
greedy
,
math
,
strings
1600
x9989
1822D
Super-Permutation
constructive algorithms
,
math
1200
x16165
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