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Codeforces Round 973 (Div. 2)
10:41:15
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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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Custom test
Problems
#
Name
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x87612
579B
Finding Team Member
brute force
,
implementation
,
sortings
1300
x5245
578B
"Or" Game
brute force
,
greedy
1700
x5218
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x222
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7765
568D
Sign Posts
brute force
,
geometry
,
math
2800
x307
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5040
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10407
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3977
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10318
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x4002
556B
Case of Fake Numbers
brute force
,
implementation
1100
x7922
554B
Ohana Cleans Up
brute force
,
greedy
,
strings
1200
x9909
554A
Kyoya and Photobooks
brute force
,
math
,
strings
900
x13179
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1618
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4468
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5467
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3849
551A
GukiZ and Contest
brute force
,
implementation
,
sortings
800
x16260
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x28368
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x20833
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x37728
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8410
548A
Mike and Fax
brute force
,
implementation
,
strings
1100
x9968
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2541
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17490
546B
Soldier and Badges
brute force
,
greedy
,
implementation
,
sortings
1200
x17499
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x179056
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1723
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2421
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5798
538A
Cutting Banner
brute force
,
implementation
1400
x7109
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x22373
535A
Tavas and Nafas
brute force
,
implementation
1000
x12158
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x865
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2131
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2476
526A
King of Thieves
brute force
,
implementation
1300
x4758
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x3164
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x367
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7432
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20707
513G1
Inversions problem
brute force
,
dfs and similar
,
dp
,
meet-in-the-middle
1800
x1779
513B1
Permutations
brute force
1400
x3616
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5391
509A
Maximum in Table
brute force
,
implementation
800
x38119
508A
Pasha and Pixels
brute force
1100
x7863
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2122
505A
Mr. Kitayuta's Gift
brute force
,
implementation
,
strings
1100
x6659
497D
Gears
brute force
,
geometry
,
math
2900
x228
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x7712
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x5860
496A
Minimum Difficulty
brute force
,
implementation
,
math
900
x16340
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6781
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1591
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2130
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x9059
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6662
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2116
488A
Giga Tower
brute force
1100
x14235
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3715
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11691
485B
Valuable Resources
brute force
,
greedy
1300
x6522
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22949
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7870
479A
Expression
brute force
,
math
1000
x93241
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x220
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x30435
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4812
475C
Kamal-ol-molk's Painting
brute force
,
constructive algorithms
,
greedy
2100
x784
475B
Strongly Connected City
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x8438
474C
Captain Marmot
brute force
,
geometry
2000
x3106
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3551
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x37415
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x35915
466B
Wonder Room
brute force
,
math
2000
x4894
464B
Restore Cube
brute force
,
geometry
2000
x1706
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1597
463B
Caisa and Pylons
brute force
,
implementation
,
math
1100
x27068
463A
Caisa and Sugar
brute force
,
implementation
1200
x9243
462A
Appleman and Easy Task
brute force
,
implementation
1000
x16838
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x342
460D
Little Victor and Set
brute force
,
constructive algorithms
,
math
2300
x994
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12306
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x45718
457C
Elections
brute force
2100
x876
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4667
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1994
452A
Eevee
brute force
,
implementation
,
strings
1000
x7986
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3322
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1537
448D
Multiplication Table
binary search
,
brute force
1800
x13941
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3572
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x4053
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2108
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x904
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3857
436F
Banners
brute force
,
data structures
,
dp
3000
x386
435D
Special Grid
brute force
,
dp
,
greedy
2000
x756
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x16270
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