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Codeforces and Polygon may be unavailable from
May 23, 4:00 (UTC)
to
May 23, 8:00 (UTC)
due to technical maintenance.
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Codeforces Round (Div. 1 + Div. 2)
2 days
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→ Filter Problems
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constructive algorithms
combine-tags-by-or
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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
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number theory
probabilities
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shortest paths
sortings
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strings
ternary search
trees
two pointers
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Problems
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Custom test
Problems
#
Name
761D
Dasha and Very Difficult Problem
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
1700
x3944
761A
Dasha and Stairs
brute force
,
constructive algorithms
,
implementation
,
math
1000
x14342
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2688
758C
Unfair Poll
binary search
,
constructive algorithms
,
implementation
,
math
1700
x3822
756A
Pavel and barbecue
constructive algorithms
,
dfs and similar
1700
x2962
755E
PolandBall and White-Red graph
constructive algorithms
,
graphs
,
shortest paths
2400
x816
754C
Vladik and chat
brute force
,
constructive algorithms
,
dp
,
implementation
,
strings
2200
x909
754A
Lesha and array splitting
constructive algorithms
,
greedy
,
implementation
1200
x8546
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x281
753B
Interactive Bulls and Cows (Easy)
brute force
,
constructive algorithms
,
implementation
1600
x1173
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x472
749B
Parallelogram is Back
brute force
,
constructive algorithms
,
geometry
1200
x8376
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x633
748D
Santa Claus and a Palindrome
constructive algorithms
,
data structures
,
greedy
2100
x1812
748C
Santa Claus and Robot
constructive algorithms
,
math
1400
x4542
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1334
746D
Green and Black Tea
constructive algorithms
,
greedy
,
math
1500
x4989
746C
Tram
constructive algorithms
,
implementation
,
math
1600
x3685
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x11868
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14268
743A
Vladik and flights
constructive algorithms
,
greedy
,
implementation
1200
x10857
741C
Arpa’s overnight party and Mehrdad’s silent entering
constructive algorithms
,
dfs and similar
,
graphs
2600
x2383
740B
Alyona and flowers
constructive algorithms
1200
x8149
739A
Alyona and mex
constructive algorithms
,
greedy
1700
x7611
737F
Dirty plates
constructive algorithms
,
math
3300
x69
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x182
735C
Tennis Championship
combinatorics
,
constructive algorithms
,
greedy
,
math
1600
x7347
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1279
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x866
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3300
732C
Sanatorium
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x9477
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x67751
731B
Coupons and Discounts
constructive algorithms
,
greedy
1100
x7867
730H
Delete Them
constructive algorithms
,
implementation
1300
x2923
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x2383
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2153
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x3629
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x1801
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x6944
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2604
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x1886
721D
Maxim and Array
constructive algorithms
,
data structures
,
greedy
,
math
2000
x2298
720C
Homework
constructive algorithms
3100
x97
715D
Create a Maze
constructive algorithms
3100
x246
715B
Complete The Graph
binary search
,
constructive algorithms
,
graphs
,
shortest paths
2300
x2665
715A
Plus and Square Root
constructive algorithms
,
math
1600
x5547
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1420
711B
Chris and Magic Square
constructive algorithms
,
implementation
1400
x8352
710C
Magic Odd Square
constructive algorithms
,
math
1500
x4991
708B
Recover the String
constructive algorithms
,
greedy
,
implementation
,
math
1900
x3206
708A
Letters Cyclic Shift
constructive algorithms
,
greedy
,
implementation
,
strings
1200
x8918
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5621
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x78
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5196
688B
Lovely Palindromes
constructive algorithms
,
math
1000
x30366
686B
Little Robber Girl's Zoo
constructive algorithms
,
implementation
,
sortings
1100
x7720
686A
Free Ice Cream
constructive algorithms
,
implementation
800
x35725
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20620
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1721
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7305
680B
Bear and Finding Criminals
constructive algorithms
,
implementation
1000
x23498
680A
Bear and Five Cards
constructive algorithms
,
implementation
800
x12191
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x12410
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13653
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3423
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7302
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17085
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x847
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16458
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5457
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3213
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3256
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1616
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6177
652F
Ants on a Circle
constructive algorithms
,
math
2800
x517
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x343
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x439
649B
Этажи
constructive algorithms
1400
x523
649A
Любимые числа Поликарпа
constructive algorithms
,
implementation
1000
x1109
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x849
648B
Собери стол
constructive algorithms
,
sortings
800
x1241
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x586
645A
Amity Assessment
brute force
,
constructive algorithms
,
implementation
1200
x3364
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2609
644A
Parliament of Berland
*special problem
,
constructive algorithms
1000
x4400
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3142
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x2844
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6401
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x3760
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2409
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x15092
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5316
634A
Island Puzzle
constructive algorithms
,
implementation
1300
x3090
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x571
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6548
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x3910
631B
Print Check
constructive algorithms
,
implementation
1200
x7253
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13143
626B
Cards
constructive algorithms
,
dp
,
math
1300
x6525
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x623
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