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Rayan
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Before contest
Good Bye 2024: 2025 is NEAR
4 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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Custom test
Problems
#
Name
485B
Valuable Resources
brute force
,
greedy
1300
x6549
485A
Factory
implementation
,
math
,
matrices
1400
x8355
484E
Sign on Fence
binary search
,
constructive algorithms
,
data structures
2500
x2383
484D
Kindergarten
data structures
,
dp
,
greedy
2400
x2684
484C
Strange Sorting
implementation
,
math
2600
x596
484B
Maximum Value
binary search
,
math
,
sortings
,
two pointers
2100
x7115
484A
Bits
bitmasks
,
constructive algorithms
1700
x11570
483B
Friends and Presents
binary search
,
math
1800
x4107
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x23343
482E
ELCA
data structures
,
trees
3200
x177
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x539
482C
Game with Strings
bitmasks
,
dp
,
probabilities
2600
x945
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6627
482A
Diverse Permutation
constructive algorithms
,
greedy
1200
x9696
480E
Parking Lot
data structures
,
divide and conquer
2800
x573
480D
Parcels
dp
,
graphs
2600
x461
479E
Riding in a Lift
combinatorics
,
dp
1900
x5197
479D
Long Jumps
binary search
,
greedy
,
implementation
1700
x4847
479C
Exams
greedy
,
sortings
1400
x30044
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7948
479A
Expression
brute force
,
math
1000
x96417
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x221
478D
Red-Green Towers
dp
2000
x6113
478C
Table Decorations
greedy
1800
x18495
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x37137
478A
Initial Bet
implementation
1100
x25862
477E
Dreamoon and Notepad
data structures
3100
x135
477D
Dreamoon and Binary
dp
,
strings
2700
x530
476E
Dreamoon and Strings
dp
,
strings
2200
x1976
476D
Dreamoon and Sets
constructive algorithms
,
greedy
,
math
1900
x4714
476C
Dreamoon and Sums
math
1600
x5762
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x31469
476A
Dreamoon and Stairs
implementation
,
math
1000
x44802
475F
Meta-universe
data structures
2900
x233
475E
Strongly Connected City 2
dfs and similar
2700
x415
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x5069
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x788
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8589
475A
Bayan Bus
implementation
1100
x4788
474F
Ant colony
data structures
,
math
,
number theory
2100
x8962
474E
Pillars
binary search
,
data structures
,
dp
,
sortings
,
trees
2000
x3460
474D
Flowers
dp
1700
x26002
474C
Captain Marmot
brute force
,
geometry
2000
x3155
474B
Worms
binary search
,
implementation
1200
x50095
474A
Keyboard
implementation
900
x46549
472G
Design Tutorial: Increase the Constraints
bitmasks
,
data structures
,
fft
2800
x410
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x259
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x132
472D
Design Tutorial: Inverse the Problem
dfs and similar
,
dsu
,
shortest paths
,
trees
1900
x5506
472C
Design Tutorial: Make It Nondeterministic
greedy
1400
x6374
472B
Design Tutorial: Learn from Life
1300
x7458
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x61403
471E
MUH and Lots and Lots of Segments
data structures
,
dsu
2700
x83
471D
MUH and Cube Walls
string suffix structures
,
strings
1800
x8392
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3577
471B
MUH and Important Things
implementation
,
sortings
1300
x5972
471A
MUH and Sticks
implementation
1100
x13453
470H
Array Sorting
*special problem
2300
x189
470G
Hamming Distance
*special problem
2300
x95
470F
Pairwise Sums
*special problem
2300
x106
470E
Chessboard
*special problem
1900
x198
470D
Caesar Cipher
*special problem
1900
x153
470C
Eval
*special problem
1900
x255
470B
Hexakosioihexekontahexaphobia
*special problem
1800
x260
470A
Crystal Ball Sequence
*special problem
,
implementation
1400
x680
469B
Chat Online
implementation
1300
x12755
469A
I Wanna Be the Guy
greedy
,
implementation
800
x100698
468E
Permanent
dp
,
graph matchings
,
math
,
meet-in-the-middle
3100
x325
468D
Tree
graph matchings
3100
x369
468C
Hack it!
binary search
,
constructive algorithms
,
math
2500
x2433
468B
Two Sets
2-sat
,
dfs and similar
,
dsu
,
graph matchings
,
greedy
2000
x4304
468A
24 Game
constructive algorithms
,
greedy
,
math
1500
x8023
467E
Alex and Complicated Task
data structures
,
dp
,
greedy
2300
x792
467D
Fedor and Essay
dfs and similar
,
dp
,
graphs
,
hashing
,
strings
2400
x1866
467C
George and Job
dp
,
implementation
1700
x14854
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x38253
467A
George and Accommodation
implementation
800
x126462
466E
Information Graph
dfs and similar
,
dsu
,
graphs
,
trees
2100
x2273
466D
Increase Sequence
combinatorics
,
dp
2100
x3278
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x36796
466B
Wonder Room
brute force
,
math
2000
x4947
466A
Cheap Travel
implementation
1200
x64980
465B
Inbox (100500)
implementation
1000
x10470
465A
inc ARG
implementation
900
x10098
464E
The Classic Problem
data structures
,
graphs
,
shortest paths
3000
x1516
464D
World of Darkraft - 2
dp
,
probabilities
2700
x673
464C
Substitutes in Number
dp
2100
x1859
464B
Restore Cube
brute force
,
geometry
2000
x1714
464A
No to Palindromes!
greedy
,
strings
1700
x5934
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1625
463D
Gargari and Permutations
dfs and similar
,
dp
,
graphs
,
implementation
1900
x6614
463C
Gargari and Bishops
greedy
,
hashing
,
implementation
1900
x8789
463B
Caisa and Pylons
brute force
,
implementation
,
math
1100
x27688
463A
Caisa and Sugar
brute force
,
implementation
1200
x9292
462B
Appleman and Card Game
greedy
1300
x14601
462A
Appleman and Easy Task
brute force
,
implementation
1000
x16994
461E
Appleman and a Game
binary search
,
shortest paths
,
strings
3000
x454
461D
Appleman and Complicated Task
dsu
,
math
2800
x367
461C
Appleman and a Sheet of Paper
data structures
,
implementation
2200
x1336
461B
Appleman and Tree
dfs and similar
,
dp
,
trees
2000
x5863
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