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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
12:23:53
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Difficulty:
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constructive algorithms
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
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Custom test
Problems
#
Name
753B
Interactive Bulls and Cows (Easy)
brute force
,
constructive algorithms
,
implementation
1600
x1211
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x488
749B
Parallelogram is Back
brute force
,
constructive algorithms
,
geometry
1200
x8513
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x661
748D
Santa Claus and a Palindrome
constructive algorithms
,
data structures
,
greedy
2100
x1876
748C
Santa Claus and Robot
constructive algorithms
,
math
1400
x4631
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1531
746D
Green and Black Tea
constructive algorithms
,
greedy
,
math
1500
x5122
746C
Tram
constructive algorithms
,
implementation
,
math
1600
x3739
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x12377
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14953
743A
Vladik and flights
constructive algorithms
,
greedy
,
implementation
1200
x11184
741C
Arpa’s overnight party and Mehrdad’s silent entering
constructive algorithms
,
dfs and similar
,
graphs
2600
x2641
740B
Alyona and flowers
constructive algorithms
1200
x8339
739A
Alyona and mex
constructive algorithms
,
greedy
1700
x7884
737F
Dirty plates
constructive algorithms
,
math
3300
x70
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x187
735C
Tennis Championship
combinatorics
,
constructive algorithms
,
greedy
,
math
1600
x7546
734F
Anton and School
bitmasks
,
constructive algorithms
,
implementation
,
math
2500
x1304
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x956
733C
Epidemic in Monstropolis
constructive algorithms
,
dp
,
greedy
,
two pointers
1800
x3348
732C
Sanatorium
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
1200
x9754
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x73329
731B
Coupons and Discounts
constructive algorithms
,
greedy
1100
x8004
730H
Delete Them
constructive algorithms
,
implementation
1300
x3056
730B
Minimum and Maximum
constructive algorithms
,
interactive
1800
x2490
729E
Subordinates
constructive algorithms
,
data structures
,
graphs
,
greedy
,
sortings
1900
x2238
729D
Sea Battle
constructive algorithms
,
greedy
,
math
1700
x3772
727D
T-shirts Distribution
constructive algorithms
,
flows
,
greedy
1800
x1887
727C
Guess the Array
constructive algorithms
,
interactive
,
math
1400
x7500
725C
Hidden Word
brute force
,
constructive algorithms
,
implementation
,
strings
1600
x2648
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x2000
721D
Maxim and Array
constructive algorithms
,
data structures
,
greedy
,
math
2000
x2356
720C
Homework
constructive algorithms
3100
x103
715D
Create a Maze
constructive algorithms
3100
x292
715B
Complete The Graph
binary search
,
constructive algorithms
,
graphs
,
shortest paths
2300
x2910
715A
Plus and Square Root
constructive algorithms
,
math
1600
x5625
713B
Searching Rectangles
binary search
,
constructive algorithms
,
interactive
2200
x1458
711B
Chris and Magic Square
constructive algorithms
,
implementation
1400
x8425
710C
Magic Odd Square
constructive algorithms
,
math
1500
x5137
708B
Recover the String
constructive algorithms
,
greedy
,
implementation
,
math
1900
x3265
708A
Letters Cyclic Shift
constructive algorithms
,
greedy
,
implementation
,
strings
1200
x9016
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5758
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x84
689A
Mike and Cellphone
brute force
,
constructive algorithms
,
implementation
1400
x5274
688B
Lovely Palindromes
constructive algorithms
,
math
1000
x32429
686B
Little Robber Girl's Zoo
constructive algorithms
,
implementation
,
sortings
1100
x7807
686A
Free Ice Cream
constructive algorithms
,
implementation
800
x37969
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x21852
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1788
681C
Heap Operations
constructive algorithms
,
data structures
,
greedy
1600
x7820
680B
Bear and Finding Criminals
constructive algorithms
,
implementation
1000
x24483
680A
Bear and Five Cards
constructive algorithms
,
implementation
800
x12552
679A
Bear and Prime 100
constructive algorithms
,
interactive
,
math
1400
x13149
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13856
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3663
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7425
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17441
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x862
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x17082
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5636
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3596
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3303
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1635
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6301
652F
Ants on a Circle
constructive algorithms
,
math
2800
x557
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x361
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x461
649B
Этажи
constructive algorithms
1400
x539
649A
Любимые числа Поликарпа
constructive algorithms
,
implementation
1000
x1301
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x995
648B
Собери стол
constructive algorithms
,
sortings
800
x1547
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x711
645A
Amity Assessment
brute force
,
constructive algorithms
,
implementation
1200
x3465
644B
Processing Queries
*special problem
,
constructive algorithms
,
data structures
,
two pointers
1700
x2705
644A
Parliament of Berland
*special problem
,
constructive algorithms
1000
x4459
643B
Bear and Two Paths
constructive algorithms
,
graphs
1600
x3179
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x3081
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6532
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x4050
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2428
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x17078
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5418
634A
Island Puzzle
constructive algorithms
,
implementation
1300
x3328
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x587
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6711
632B
Alice, Bob, Two Teams
brute force
,
constructive algorithms
1400
x4015
631B
Print Check
constructive algorithms
,
implementation
1200
x7445
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13472
626B
Cards
constructive algorithms
,
dp
,
math
1300
x6633
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x635
625C
K-special Tables
constructive algorithms
,
implementation
1300
x6840
625B
War of the Corporations
constructive algorithms
,
greedy
,
strings
1200
x10465
623A
Graph and String
constructive algorithms
,
graphs
1800
x4507
622D
Optimal Number Permutation
constructive algorithms
1900
x3012
621D
Rat Kwesh and Cheese
brute force
,
constructive algorithms
,
math
2400
x998
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1408
618B
Guess the Permutation
constructive algorithms
1100
x7997
617D
Polyline
constructive algorithms
,
implementation
1700
x4226
613C
Necklace
constructive algorithms
,
math
2500
x1015
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