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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
Standings
Custom test
Problems
#
Name
1893C
Freedom of Choice
brute force
,
greedy
,
implementation
2000
x2509
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8314
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x11638
1891F
A Growing Tree
data structures
,
dfs and similar
,
trees
2000
x3481
1891E
Brukhovich and Exams
brute force
,
greedy
,
implementation
,
math
,
sortings
2500
x792
1891D
Suspicious logarithms
binary search
,
brute force
,
math
1900
x3796
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11964
1891B
Deja Vu
brute force
,
math
,
sortings
1100
x16559
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18720
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x16972
1890A
Doremy's Paint 3
constructive algorithms
800
x23372
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x70
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x103
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x540
1889C2
Doremy's Drying Plan (Hard Version)
data structures
,
dp
2600
x915
1889C1
Doremy's Drying Plan (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
sortings
2000
x3098
1889B
Doremy's Connecting Plan
constructive algorithms
,
greedy
,
math
,
sortings
1700
x6966
1889A
Qingshan Loves Strings 2
constructive algorithms
,
greedy
,
implementation
1300
x12428
1887F
Minimum Segments
constructive algorithms
3400
x120
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x342
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x838
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1619
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2773
1886F
Diamond Theft
data structures
,
greedy
3300
x162
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1371
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3398
1886C
Decreasing String
implementation
,
strings
1600
x10670
1886B
Fear of the Dark
binary search
,
geometry
,
math
1200
x15530
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x25038
1885A
Deterministic Scheduling for Extended Reality over 5G and Beyond
*special problem
1884E
Hard Design
greedy
,
implementation
,
math
2800
x271
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2970
1884C
Medium Design
brute force
,
data structures
,
dp
,
greedy
,
sortings
1700
x5689
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12099
1884A
Simple Design
brute force
,
greedy
,
math
800
x16859
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x5053
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9813
1883F
You Are So Beautiful
data structures
1400
x8721
1883E
Look Back
bitmasks
,
greedy
1700
x7440
1883D
In Love
data structures
,
greedy
1500
x10582
1883C
Raspberries
dp
,
math
1000
x24356
1883B
Chemistry
strings
900
x28736
1883A
Morning
math
800
x24658
1882E2
Two Permutations (Hard Version)
constructive algorithms
3100
x287
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x977
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5130
1882C
Card Game
brute force
,
greedy
1500
x11698
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14803
1882A
Increasing Sequence
greedy
800
x24799
1881G
Anya and the Mysterious String
binary search
,
data structures
2000
x2229
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x6291
1881E
Block Sequence
dp
1500
x12499
1881D
Divide and Equalize
math
,
number theory
1300
x15503
1881C
Perfect Square
brute force
,
implementation
1200
x16313
1881B
Three Threadlets
math
900
x24362
1881A
Don't Try to Count
brute force
,
strings
800
x28887
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x479
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1207
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6925
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x15652
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x21688
1879A
Rigged!
greedy
800
x22648
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1128
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3916
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11727
1878D
Reverse Madness
data structures
,
greedy
1600
x7877
1878C
Vasilije in Cacak
math
900
x30020
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x30556
1878A
How Much Does Daytona Cost?
greedy
800
x40752
1877C
Joyboard
math
,
number theory
1200
x10417
1877A
Goals of Victory
math
800
x20379
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x119
1876F
Indefinite Clownfish
binary search
,
graphs
3500
x124
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x260
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x834
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2185
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7800
1876A
Helmets in Night Light
greedy
,
sortings
1000
x15802
1875D
Jellyfish and Mex
dp
1600
x7953
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11164
1875A
Jellyfish and Undertale
brute force
,
greedy
900
x23091
1874G
Jellyfish and Inscryption
dp
3500
x79
1874F
Jellyfish and OEIS
dp
3500
x191
1874E
Jellyfish and Hack
dp
,
math
3000
x289
1874D
Jellyfish and Miku
divide and conquer
,
dp
,
math
,
probabilities
2800
x675
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
2300
x1545
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1095
1874A
Jellyfish and Game
brute force
,
games
,
greedy
,
implementation
1200
x16353
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6855
1873G
ABBC or BACB
constructive algorithms
,
greedy
1500
x12313
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14546
1873E
Building an Aquarium
binary search
,
sortings
1100
x24319
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33695
1873C
Target Practice
implementation
,
math
800
x37195
1873B
Good Kid
brute force
,
greedy
,
math
800
x46071
1873A
Short Sort
brute force
,
implementation
800
x50750
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x4084
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5981
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12574
1872D
Plus Minus Permutation
math
1200
x21998
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