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Rayan Programming Contest 2024 - Selection (Codeforces Round, Div. 1 + Div. 2)
5 days
Register now »
*has extra registration
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Difficulty:
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binary search
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
809B
Glad to see you!
binary search
,
interactive
2200
x1689
808F
Card Game
binary search
,
flows
,
graphs
2400
x1209
808E
Selling Souvenirs
binary search
,
dp
,
greedy
,
ternary search
2300
x1865
808D
Array Division
binary search
,
data structures
,
implementation
1900
x7034
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1335
803D
Magazine Ad
binary search
,
greedy
1900
x3307
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x975
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1206
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x116
799C
Fountains
binary search
,
data structures
,
implementation
1800
x3782
796E
Exam Cheating
binary search
,
dp
2400
x683
785C
Anton and Fairy Tale
binary search
,
math
1600
x7407
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x118
780B
The Meeting Place Cannot Be Changed
binary search
1600
x9836
778A
String Game
binary search
,
greedy
,
strings
1700
x11676
777D
Cloud of Hashtags
binary search
,
greedy
,
implementation
,
strings
1800
x5037
777C
Alyona and Spreadsheet
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1600
x6421
776C
Molly's Chemicals
binary search
,
brute force
,
data structures
,
implementation
,
math
1800
x5958
774L
Bars
*special problem
,
binary search
2000
x341
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x109
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x225
773C
Prairie Partition
binary search
,
constructive algorithms
,
greedy
,
math
2200
x961
773A
Success Rate
binary search
,
math
1700
x4483
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x147
772A
Voltage Keepsake
binary search
,
math
1800
x4369
768G
The Winds of Winter
binary search
,
data structures
3300
x363
767D
Cartons of milk
binary search
,
data structures
,
greedy
,
sortings
,
two pointers
2100
x2252
762E
Radio stations
binary search
,
data structures
2200
x1415
762C
Two strings
binary search
,
hashing
,
strings
,
two pointers
2100
x2581
761D
Dasha and Very Difficult Problem
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
1700
x4068
760B
Frodo and pillows
binary search
,
greedy
1500
x6634
758C
Unfair Poll
binary search
,
constructive algorithms
,
implementation
,
math
1700
x3885
756B
Travel Card
binary search
,
dp
1600
x3708
755B
PolandBall and Game
binary search
,
data structures
,
games
,
greedy
,
sortings
,
strings
1100
x11356
754D
Fedor and coupons
binary search
,
data structures
,
greedy
,
sortings
2100
x2466
750C
New Year and Rating
binary search
,
greedy
,
math
1600
x6570
750A
New Year and Hurry
binary search
,
brute force
,
implementation
,
math
800
x76739
749D
Leaving Auction
binary search
,
data structures
2000
x2572
748E
Santa Claus and Tangerines
binary search
,
data structures
,
greedy
,
two pointers
2100
x1506
743E
Vladik and cards
binary search
,
bitmasks
,
brute force
,
dp
2200
x1509
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14959
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4671
734C
Anton and Making Potions
binary search
,
dp
,
greedy
,
two pointers
1600
x5347
732D
Exams
binary search
,
greedy
,
sortings
1700
x5577
732C
Sanatorium
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x9756
730C
Bulmart
binary search
,
dfs and similar
2100
x1252
729C
Road to Cinema
binary search
,
greedy
,
sortings
1700
x3940
727F
Polycarp's problems
binary search
,
dp
,
greedy
2300
x797
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3192
721E
Road to Home
binary search
,
dp
2700
x306
715B
Complete The Graph
binary search
,
constructive algorithms
,
graphs
,
shortest paths
2300
x2915
713E
Sonya Partymaker
binary search
,
dp
3300
x353
713D
Animals and Puzzle
binary search
,
data structures
2700
x1159
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1459
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x10223
706B
Interesting drink
binary search
,
dp
,
implementation
1100
x64584
702C
Cellular Network
binary search
,
implementation
,
two pointers
1500
x15373
701C
They Are Everywhere
binary search
,
strings
,
two pointers
1500
x15356
700A
As Fast As Possible
binary search
,
math
1900
x3200
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x124
689D
Friends and Subsequences
binary search
,
data structures
2100
x3490
689C
Mike and Chocolate Thieves
binary search
,
combinatorics
,
math
1700
x5395
685C
Optimal Point
binary search
,
math
2900
x585
679B
Bear and Tower of Cubes
binary search
,
dp
,
greedy
2200
x2152
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x603
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x19070
671B
Robin Hood
binary search
,
greedy
2000
x3039
670D2
Magic Powder - 2
binary search
,
implementation
1500
x14700
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x18307
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1685
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9552
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2506
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1360
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3358
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x108
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x112
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2937
645C
Enduring Exodus
binary search
,
two pointers
1600
x3333
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x922
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x583
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x17106
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x587
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x874
626E
Simple Skewness
binary search
,
math
,
ternary search
2400
x1412
623C
Electric Charges
binary search
,
dp
2900
x481
620D
Professor GukiZ and Two Arrays
binary search
,
two pointers
2200
x1730
616D
Longest k-Good Segment
binary search
,
data structures
,
two pointers
1600
x9730
615E
Hexagons
binary search
,
implementation
,
math
2100
x987
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2242
613A
Peter and Snow Blower
binary search
,
geometry
,
ternary search
1900
x3249
611F
New Year and Cleaning
binary search
,
implementation
2500
x484
609D
Gadgets for dollars and pounds
binary search
,
greedy
,
two pointers
2000
x2762
607E
Cross Sum
binary search
,
geometry
3300
x255
607A
Chain Reaction
binary search
,
dp
1600
x9657
604B
More Cowbell
binary search
,
greedy
1400
x8504
600B
Queries about less or equal elements
binary search
,
data structures
,
sortings
,
two pointers
1300
x30556
595B
Pasha and Phone
binary search
,
math
1600
x2929
594B
Max and Bike
binary search
,
geometry
2500
x501
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x216
590B
Chip 'n Dale Rescue Rangers
binary search
,
geometry
,
math
2100
x1917
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