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Codeforces Round (Div. 1 + Div. 2)
43:06:40
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Difficulty:
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brute force
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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Status
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Custom test
Problems
#
Name
621D
Rat Kwesh and Cheese
brute force
,
constructive algorithms
,
math
2400
x963
614A
Link/Cut Tree
brute force
,
implementation
1500
x7401
613B
Skills
binary search
,
brute force
,
dp
,
greedy
,
sortings
,
two pointers
1900
x2173
612A
The Text Splitting
brute force
,
implementation
,
strings
1300
x7042
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9803
602A
Two Bases
brute force
,
implementation
1100
x8370
599D
Spongebob and Squares
brute force
,
math
1900
x2531
598E
Chocolate Bar
brute force
,
dp
2000
x4637
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x673
593A
2Char
brute force
,
implementation
1200
x5680
585A
Gennady the Dentist
brute force
,
implementation
1800
x4115
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x8867
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3443
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x84372
579B
Finding Team Member
brute force
,
implementation
,
sortings
1300
x5222
578B
"Or" Game
brute force
,
greedy
1700
x5121
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x211
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7618
568D
Sign Posts
brute force
,
geometry
,
math
2800
x298
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5002
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10299
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3937
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10193
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x3942
556B
Case of Fake Numbers
brute force
,
implementation
1100
x7880
554B
Ohana Cleans Up
brute force
,
greedy
,
strings
1200
x9698
554A
Kyoya and Photobooks
brute force
,
math
,
strings
900
x12745
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1410
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4360
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5391
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3759
551A
GukiZ and Contest
brute force
,
implementation
,
sortings
800
x16042
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x27354
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x19605
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x36431
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8284
548A
Mike and Fax
brute force
,
implementation
,
strings
1100
x9842
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2314
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17104
546B
Soldier and Badges
brute force
,
greedy
,
implementation
,
sortings
1200
x17247
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x168974
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1499
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2406
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5762
538A
Cutting Banner
brute force
,
implementation
1400
x7073
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21706
535A
Tavas and Nafas
brute force
,
implementation
1000
x11848
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x853
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2071
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2270
526A
King of Thieves
brute force
,
implementation
1300
x4726
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2765
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x352
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7369
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20230
513G1
Inversions problem
brute force
,
dfs and similar
,
dp
,
meet-in-the-middle
1800
x1756
513B1
Permutations
brute force
1400
x3575
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5196
509A
Maximum in Table
brute force
,
implementation
800
x37344
508A
Pasha and Pixels
brute force
1100
x7796
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2032
505A
Mr. Kitayuta's Gift
brute force
,
implementation
,
strings
1100
x6604
497D
Gears
brute force
,
geometry
,
math
2900
x224
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x7600
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x5811
496A
Minimum Difficulty
brute force
,
implementation
,
math
900
x16137
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6680
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1553
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2070
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x8916
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6551
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2081
488A
Giga Tower
brute force
1100
x14068
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3665
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11518
485B
Valuable Resources
brute force
,
greedy
1300
x6452
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22283
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7555
479A
Expression
brute force
,
math
1000
x89279
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x206
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x29171
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4500
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x777
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8255
474C
Captain Marmot
brute force
,
geometry
2000
x3069
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3538
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x36111
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34711
466B
Wonder Room
brute force
,
math
2000
x4613
464B
Restore Cube
brute force
,
geometry
2000
x1663
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1386
463B
Caisa and Pylons
brute force
,
implementation
,
math
1100
x25932
463A
Caisa and Sugar
brute force
,
implementation
1200
x9108
462A
Appleman and Easy Task
brute force
,
implementation
1000
x16580
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x335
460D
Little Victor and Set
brute force
,
constructive algorithms
,
math
2300
x976
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12110
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x44420
457C
Elections
brute force
2100
x869
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4531
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