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Codeforces Round 987 (Div. 2)
11:12:02
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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
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
672A
Summer Camp
implementation
800
x15373
670B
Game of Robots
implementation
1000
x11274
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x17060
669A
Little Artem and Presents
math
800
x10857
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5630
667A
Pouring Rain
geometry
,
math
1100
x8050
664A
Complicated GCD
math
,
number theory
800
x18379
660B
Seating On Bus
implementation
1000
x5378
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x9014
659C
Tanya and Toys
greedy
,
implementation
1200
x11502
659A
Round House
implementation
,
math
1000
x15865
658A
Bear and Reverse Radewoosh
implementation
800
x7086
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x8248
652B
z-sort
sortings
1000
x10335
651B
Beautiful Paintings
greedy
,
sortings
1200
x11584
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x23018
649A
Любимые числа Поликарпа
constructive algorithms
,
implementation
1000
x1297
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x991
648B
Собери стол
constructive algorithms
,
sortings
800
x1485
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x704
645B
Mischievous Mess Makers
greedy
,
math
1200
x3409
645A
Amity Assessment
brute force
,
constructive algorithms
,
implementation
1200
x3459
644A
Parliament of Berland
*special problem
,
constructive algorithms
1000
x4458
641A
Little Artem and Grasshopper
implementation
1000
x5937
639A
Bear and Displayed Friends
implementation
1200
x6154
638A
Home Numbers
*special problem
,
constructive algorithms
,
math
1100
x4045
637B
Chat Order
*special problem
,
binary search
,
constructive algorithms
,
data structures
,
sortings
1200
x17017
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5417
635A
Orchestra
brute force
,
implementation
1100
x2920
633A
Ebony and Ivory
brute force
,
math
,
number theory
1100
x12847
632A
Grandma Laura and Apples
1200
x4604
631B
Print Check
constructive algorithms
,
implementation
1200
x7440
631A
Interview
brute force
,
implementation
900
x9334
630R
Game
games
,
math
1200
x8704
630J
Divisibility
math
,
number theory
1100
x11184
630D
Hexagons!
math
1100
x11078
630C
Lucky Numbers
combinatorics
,
math
1100
x22278
630B
Moore's Law
math
1200
x7459
630A
Again Twenty Five!
number theory
800
x69432
629B
Far Relative’s Problem
brute force
1100
x8053
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13460
628A
Tennis Tournament
implementation
,
math
1000
x6407
626A
Robot Sequence
brute force
,
implementation
1000
x6266
625B
War of the Corporations
constructive algorithms
,
greedy
,
strings
1200
x10461
624B
Making a String
greedy
,
sortings
1100
x7998
624A
Save Luke
math
800
x10361
622B
The Time
implementation
900
x9665
622A
Infinite Sequence
implementation
,
math
1000
x9411
621A
Wet Shark and Odd and Even
implementation
900
x20675
620B
Grandfather Dovlet’s calculator
implementation
1000
x9633
620A
Professor GukiZ's Robot
implementation
,
math
800
x13265
618B
Guess the Permutation
constructive algorithms
1100
x7993
618A
Slime Combining
implementation
800
x8352
617A
Elephant
math
800
x189052
616B
Dinner with Emma
games
,
greedy
1000
x11983
616A
Comparing Two Long Integers
implementation
,
strings
900
x9937
615A
Bulbs
implementation
800
x17472
612B
HDD is Outdated Technology
implementation
,
math
1200
x7121
611A
New Year and Days
implementation
900
x11660
610A
Pasha and Stick
combinatorics
,
math
1000
x23478
609B
The Best Gift
constructive algorithms
,
implementation
1100
x9174
609A
USB Flash Drives
greedy
,
implementation
,
sortings
800
x17402
608A
Saitama Destroys Hotel
implementation
,
math
1000
x9370
606A
Magic Spheres
implementation
1200
x7993
604A
Uncowed Forces
implementation
1000
x8999
602A
Two Bases
brute force
,
implementation
1100
x8516
599A
Patrick and Shopping
implementation
800
x29177
598A
Tricky Sum
math
900
x26784
596B
Wilbur and Array
greedy
,
implementation
1100
x10374
596A
Wilbur and Swimming Pool
geometry
,
implementation
1100
x7749
595A
Vitaly and Night
constructive algorithms
,
implementation
800
x14551
593A
2Char
brute force
,
implementation
1200
x5794
592B
The Monster and the Squirrel
math
1100
x8638
592A
PawnChess
implementation
1200
x6359
591B
Rebranding
implementation
,
strings
1200
x8252
591A
Wizards' Duel
implementation
,
math
900
x14575
588A
Duff and Meat
greedy
900
x22964
586A
Alena's Schedule
implementation
900
x10147
584A
Olesya and Rodion
math
1000
x45594
583B
Robot's Task
greedy
,
implementation
1200
x8733
583A
Asphalting Roads
implementation
1000
x11452
581B
Luxurious Houses
implementation
,
math
1100
x13092
581A
Vasya the Hipster
implementation
,
math
800
x71863
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x88989
579A
Raising Bacteria
bitmasks
1000
x61927
577A
Multiplication Table
implementation
,
number theory
1000
x40149
574A
Bear and Elections
greedy
,
implementation
1200
x9096
572A
Arrays
sortings
900
x16648
570A
Elections
implementation
1100
x13911
569B
Inventory
greedy
,
math
1200
x7110
567A
Lineland Mail
greedy
,
implementation
900
x32452
560B
Gerald is into Art
constructive algorithms
,
implementation
1200
x7942
560A
Currency System in Geraldion
implementation
,
sortings
1000
x17213
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10372
557A
Ilya and Diplomas
greedy
,
implementation
,
math
1100
x8272
556B
Case of Fake Numbers
brute force
,
implementation
1100
x7943
556A
Case of the Zeros and Ones
greedy
900
x40271
554B
Ohana Cleans Up
brute force
,
greedy
,
strings
1200
x9997
554A
Kyoya and Photobooks
brute force
,
math
,
strings
900
x13279
552B
Vanya and Books
implementation
,
math
1200
x15436
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