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Before contest
Codeforces Round 941 (Div. 1)
4 days
Before contest
Codeforces Round 941 (Div. 2)
4 days
→ Filter Problems
Difficulty:
—
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
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x211
574B
Bear and Three Musketeers
brute force
,
dfs and similar
,
graphs
,
hashing
1500
x7590
568D
Sign Posts
brute force
,
geometry
,
math
2800
x298
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x4998
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10273
558C
Amr and Chemistry
brute force
,
graphs
,
greedy
,
math
,
shortest paths
1900
x3914
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10151
557C
Arthur and Table
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
1900
x3937
556B
Case of Fake Numbers
brute force
,
implementation
1100
x7868
554B
Ohana Cleans Up
brute force
,
greedy
,
strings
1200
x9661
554A
Kyoya and Photobooks
brute force
,
math
,
strings
900
x12688
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1408
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4341
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5380
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3757
551A
GukiZ and Contest
brute force
,
implementation
,
sortings
800
x15984
550C
Divisibility by Eight
brute force
,
dp
,
math
1500
x27163
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x19349
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x36137
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8262
548A
Mike and Fax
brute force
,
implementation
,
strings
1100
x9827
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2310
546C
Soldier and Cards
brute force
,
dfs and similar
,
games
1400
x17027
546B
Soldier and Badges
brute force
,
greedy
,
implementation
,
sortings
1200
x17154
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x166530
538F
A Heap of Heaps
brute force
,
data structures
,
math
,
sortings
2200
x1493
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2406
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5756
538A
Cutting Banner
brute force
,
implementation
1400
x7046
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21536
535A
Tavas and Nafas
brute force
,
implementation
1000
x11804
529B
Group Photo 2 (online mirror version)
brute force
,
greedy
,
sortings
1900
x853
528D
Fuzzy Search
bitmasks
,
brute force
,
fft
2500
x2044
526C
Om Nom and Candies
brute force
,
greedy
,
math
2000
x2218
526A
King of Thieves
brute force
,
implementation
1300
x4724
525E
Anya and Cubes
binary search
,
bitmasks
,
brute force
,
dp
,
math
,
meet-in-the-middle
2100
x2721
518F
Pasha and Pipe
binary search
,
brute force
,
combinatorics
,
dp
,
implementation
2300
x345
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7357
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20103
513G1
Inversions problem
brute force
,
dfs and similar
,
dp
,
meet-in-the-middle
1800
x1754
513B1
Permutations
brute force
1400
x3575
510D
Fox And Jumping
bitmasks
,
brute force
,
dp
,
math
1900
x5162
509A
Maximum in Table
brute force
,
implementation
800
x37171
508A
Pasha and Pixels
brute force
1100
x7788
506D
Mr. Kitayuta's Colorful Graph
brute force
,
dfs and similar
,
dsu
,
graphs
2400
x2019
505A
Mr. Kitayuta's Gift
brute force
,
implementation
,
strings
1100
x6587
497D
Gears
brute force
,
geometry
,
math
2900
x223
496C
Removing Columns
brute force
,
constructive algorithms
,
implementation
1500
x7551
496B
Secret Combination
brute force
,
constructive algorithms
,
implementation
1500
x5797
496A
Minimum Difficulty
brute force
,
implementation
,
math
900
x16074
493C
Vasya and Basketball
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1600
x6652
490E
Restoring Increasing Sequence
binary search
,
brute force
,
greedy
,
implementation
2000
x1515
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2069
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x8892
489D
Unbearable Controversy of Being
brute force
,
combinatorics
,
dfs and similar
,
graphs
1700
x6528
488B
Candy Boxes
brute force
,
constructive algorithms
,
math
1900
x2076
488A
Giga Tower
brute force
1100
x14035
487A
Fight the Monster
binary search
,
brute force
,
implementation
1800
x3653
486C
Palindrome Transformation
brute force
,
greedy
,
implementation
1700
x11478
485B
Valuable Resources
brute force
,
greedy
1300
x6442
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22112
479B
Towers
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
1400
x7537
479A
Expression
brute force
,
math
1000
x88217
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x204
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x28920
475D
CGCDSSQ
brute force
,
data structures
,
math
2000
x4436
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
x8213
474C
Captain Marmot
brute force
,
geometry
2000
x3055
471C
MUH and House of Cards
binary search
,
brute force
,
greedy
,
math
1700
x3533
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x35644
466C
Number of Ways
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x34453
466B
Wonder Room
brute force
,
math
2000
x4586
464B
Restore Cube
brute force
,
geometry
2000
x1661
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1382
463B
Caisa and Pylons
brute force
,
implementation
,
math
1100
x25693
463A
Caisa and Sugar
brute force
,
implementation
1200
x9090
462A
Appleman and Easy Task
brute force
,
implementation
1000
x16526
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x334
460D
Little Victor and Set
brute force
,
constructive algorithms
,
math
2300
x970
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12067
460A
Vasya and Socks
brute force
,
implementation
,
math
900
x44147
457C
Elections
brute force
2100
x860
453B
Little Pony and Harmony Chest
bitmasks
,
brute force
,
dp
2000
x4515
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1973
452A
Eevee
brute force
,
implementation
,
strings
1000
x7886
451C
Predict Outcome of the Game
brute force
,
implementation
,
math
1700
x3296
448E
Divisors
brute force
,
dfs and similar
,
implementation
,
number theory
2200
x1444
448D
Multiplication Table
binary search
,
brute force
1800
x13233
446B
DZY Loves Modification
brute force
,
data structures
,
greedy
2000
x3513
443B
Kolya and Tandem Repeat
brute force
,
implementation
,
strings
1500
x3963
442A
Borya and Hanabi
bitmasks
,
brute force
,
implementation
1700
x2092
440C
One-Based Arithmetic
brute force
,
dfs and similar
,
divide and conquer
1800
x888
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3793
436F
Banners
brute force
,
data structures
,
dp
3000
x358
435D
Special Grid
brute force
,
dp
,
greedy
2000
x744
433A
Kitahara Haruki's Gift
brute force
,
implementation
1100
x15694
432B
Football Kit
brute force
,
greedy
,
implementation
1200
x11448
431B
Shower Line
brute force
,
implementation
1200
x10453
430B
Balls Game
brute force
,
two pointers
1400
x3621
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