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Before contest
Codeforces Round (Div. 2)
7 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
1842A
Tenzing and Tsondu
games
,
math
800
x19768
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x489
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x2016
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4399
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7823
1841B
Keep it Beautiful
implementation
1000
x21488
1841A
Game with Board
constructive algorithms
,
games
800
x24687
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x962
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2371
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1818
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x8046
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x13756
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x27730
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x22448
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x34012
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1221
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2323
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11974
1839B
Lamps
greedy
,
sortings
1100
x15127
1839A
The Good Array
greedy
,
implementation
,
math
800
x17470
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x315
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1478
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3257
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x14466
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x16404
1838A
Blackboard List
constructive algorithms
,
math
800
x21503
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2192
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2184
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x14764
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21968
1837B
Comparison String
greedy
900
x29701
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x32450
1836B
Astrophysicists
greedy
,
math
1100
x12639
1836A
Destroyer
implementation
,
sortings
800
x20299
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
x495
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x994
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x941
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7821
1834F
Typewriter
brute force
,
math
2500
x524
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2244
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4664
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x13281
1834B
Maximum Strength
greedy
,
math
1000
x15251
1834A
Unit Array
greedy
,
math
800
x24463
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x5376
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x7362
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x11766
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x13328
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x26092
1833B
Restore the Weather
greedy
,
sortings
900
x26494
1833A
Musical Puzzle
implementation
,
strings
800
x32601
1832F
Zombies
binary search
,
dp
3200
x270
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2170
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1905
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2937
1832C
Contrast Value
greedy
,
implementation
1200
x20772
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x21998
1832A
New Palindrome
strings
800
x25732
1831B
Array merging
constructive algorithms
,
greedy
1000
x20851
1831A
Twin Permutations
constructive algorithms
800
x26911
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
x679
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1662
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4882
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x13557
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7747
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x10448
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x17551
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x20029
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x26380
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x28523
1829B
Blank Space
implementation
800
x45897
1829A
Love Story
implementation
,
strings
800
x50706
1828B
Permutation Swap
math
,
number theory
900
x23119
1828A
Divisible Array
constructive algorithms
,
math
800
x23649
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
x756
1827C
Palindrome Partition
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
strings
2600
x1211
1827B2
Range Sorting (Hard Version)
binary search
,
data structures
,
dp
,
greedy
2400
x1877
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3875
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x19046
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x380
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1598
1826D
Running Miles
brute force
,
dp
,
greedy
1700
x9804
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x13576
1826B
Lunatic Never Content
math
,
number theory
1100
x17691
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x15193
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14685
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19656
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x130
1824D
LuoTianyi and the Function
data structures
3000
x490
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1389
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2630
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4586
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x11308
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x877
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