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Before contest
Codeforces Round (Div. 1, based on COMPFEST 15 - Final Round)
7 days
Before contest
Codeforces Round (Div. 2, based on COMPFEST 15 - Final Round)
7 days
→ Filter Problems
Difficulty:
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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
#
Name
1882E2
Two Permutations (Hard Version)
constructive algorithms
x115
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
x601
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
x3218
1882C
Card Game
brute force
,
greedy
x7941
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
x10596
1882A
Increasing Sequence
greedy
x19362
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x250
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x822
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x4107
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x9898
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x15230
1879A
Rigged!
greedy
800
x16490
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
x636
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
x2409
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
x7568
1878D
Reverse Madness
data structures
,
greedy
x4946
1878C
Vasilije in Cacak
math
x19754
1878B
Aleksa and Stack
constructive algorithms
,
math
x23383
1878A
How Much Does Daytona Cost?
greedy
x27899
1875D
Jellyfish and Mex
dp
x2775
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
x5006
1875A
Jellyfish and Undertale
greedy
x11353
1874G
Jellyfish and Inscryption
dp
x8
1874F
Jellyfish and OEIS
dp
x16
1874E
Jellyfish and Hack
dp
,
math
x63
1874D
Jellyfish and Miku
dp
,
math
,
probabilities
x190
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
x674
1874B
Jellyfish and Math
bitmasks
,
dp
,
graphs
,
shortest paths
x446
1874A
Jellyfish and Game
brute force
,
greedy
,
implementation
x8263
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x4028
1873G
ABBC or BACB
constructive algorithms
,
greedy
1500
x7310
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x9285
1873E
Building an Aquarium
binary search
,
sortings
1100
x15580
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x24405
1873C
Target Practice
implementation
,
math
800
x25204
1873B
Good Kid
brute force
,
greedy
,
math
800
x31739
1873A
Short Sort
brute force
,
implementation
800
x34027
1872G
Replace With Product
brute force
,
greedy
,
math
2000
x2788
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x4198
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x8794
1872D
Plus Minus Permutation
math
1200
x15403
1872C
Non-coprime Split
math
,
number theory
1100
x17708
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x22021
1872A
Two Vessels
brute force
,
greedy
,
math
800
x30561
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x36
1870G
MEXanization
data structures
3300
x118
1870F
Lazy Numbers
binary search
,
math
2900
x299
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x1669
1870D
Prefix Purchase
greedy
,
implementation
,
sortings
1800
x4940
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x8390
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x10482
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x15976
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x10939
1869A
Make It Zero
constructive algorithms
900
x13413
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x28
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x35
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x163
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x795
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x1804
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x4927
1868A
Fill in the Matrix
constructive algorithms
,
implementation
1300
x8832
1867F
Most Different Tree
brute force
,
constructive algorithms
,
dfs and similar
,
greedy
,
hashing
2700
x279
1867E2
Salyg1n and Array (hard version)
constructive algorithms
,
interactive
2200
x2312
1867E1
Salyg1n and Array (simple version)
constructive algorithms
,
interactive
,
math
2000
x2747
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x4113
1867C
Salyg1n and the MEX Game
constructive algorithms
,
data structures
,
games
,
greedy
,
interactive
1300
x8839
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x12684
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x16248
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x473
1866L
Lihmuf Balling
binary search
,
brute force
,
math
2400
x486
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x270
1866J
Jackets and Packets
dp
2800
x175
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x447
1866H
Happy Sets
combinatorics
2100
x1170
1866G
Grouped Carriages
binary search
,
data structures
,
dp
,
flows
,
greedy
2100
x1088
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x77
1866E
Elevators of Tamem
dp
2700
x162
1866D
Digital Wallet
dp
,
greedy
2300
x849
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x2216
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x5137
1866A
Ambitious Kid
math
800
x11107
1864I
Future Dominators
graphs
,
greedy
3500
x56
1864H
Asterism Stream
dp
,
math
,
matrices
3200
x171
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x210
1864F
Exotic Queries
data structures
,
implementation
,
sortings
2300
x1076
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2150
1864D
Matrix Cascade
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
math
1700
x5356
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x10425
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x12779
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x17752
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x38
1863H
Goldberg Machine 3
dp
,
trees
3500
x45
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x391
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x792
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2225
1863D
Two-Colored Dominoes
constructive algorithms
,
greedy
1400
x7147
1863C
MEX Repetition
implementation
,
math
1100
x11208
1863B
Split Sort
greedy
,
math
,
sortings
1100
x12170
1863A
Channel
greedy
,
implementation
800
x15278
1862G
The Great Equalizer
binary search
,
data structures
,
math
,
sortings
2000
x2029
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