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Problems
#
Name
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x8926
678B
The Same Calendar
implementation
1600
x4018
678A
Johny Likes Numbers
implementation
,
math
800
x12522
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x581
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1520
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6272
677B
Vanya and Food Processor
implementation
,
math
1400
x7527
677A
Vanya and Fence
implementation
800
x130207
676E
The Last Fight Between Human and AI
math
2400
x882
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1826
676C
Vasya and String
binary search
,
dp
,
strings
,
two pointers
1500
x18057
676B
Pyramid of Glasses
implementation
,
math
,
math
1500
x5456
676A
Nicholas and Permutation
constructive algorithms
,
implementation
800
x13622
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2601
675D
Tree Construction
data structures
,
trees
1800
x3572
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3415
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7282
675A
Infinite Sequence
math
1100
x14745
673B
Problems for Round
greedy
,
implementation
1300
x3496
673A
Bear and Game
implementation
800
x9896
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17045
672A
Summer Camp
implementation
800
x14979
671E
Organizing a Race
data structures
,
greedy
3300
x394
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1107
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x662
671B
Robin Hood
binary search
,
greedy
2000
x2967
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4104
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x847
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3151
670D2
Magic Powder - 2
binary search
,
implementation
1500
x12978
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x15917
670C
Cinema
implementation
,
sortings
1300
x8914
670B
Game of Robots
implementation
1000
x10959
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16397
669A
Little Artem and Presents
math
800
x10533
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5452
667A
Pouring Rain
geometry
,
math
1100
x7780
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1296
666D
Chain Reaction
brute force
,
geometry
3000
x258
666C
Codeword
combinatorics
,
strings
2500
x765
666B
World Tour
graphs
,
shortest paths
2000
x2064
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3413
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x576
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2860
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3198
665C
Simple Strings
dp
,
greedy
,
strings
1300
x9139
665B
Shopping
brute force
1400
x3476
665A
Buses Between Cities
implementation
1600
x2861
664A
Complicated GCD
math
,
number theory
800
x17377
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3245
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x132
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1616
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1939
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1444
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x429
661H
Rotate Matrix
*special problem
2400
x63
661G
Hungarian Notation
*special problem
2200
x50
661F
Primes in Interval
*special problem
1900
x230
661E
Divisibility Check
*special problem
2000
x78
661D
Maximal Difference
*special problem
2100
x124
661C
Array Sum
*special problem
2000
x126
661B
Seasons
*special problem
1900
x222
661A
Lazy Caterer Sequence
*special problem
1300
x627
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1507
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1226
660D
Number of Parallelograms
geometry
1900
x3823
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9033
660B
Seating On Bus
implementation
1000
x5214
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8517
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x947
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1748
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7297
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6140
659C
Tanya and Toys
greedy
,
implementation
1200
x11378
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6176
659A
Round House
implementation
,
math
1000
x15348
658A
Bear and Reverse Radewoosh
implementation
800
x6957
656G
You're a Professional
*special problem
1900
x474
656F
Ace It!
*special problem
1900
x880
656E
Out of Controls
*special problem
2000
x716
656D
Rosetta Problem
*special problem
2100
x938
656C
Without Text
*special problem
2000
x675
656B
Scrambled
*special problem
,
implementation
1700
x1628
656A
Da Vinci Powers
*special problem
1900
x3555
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x514
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x949
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1376
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2308
653C
Bear and Up-Down
brute force
,
implementation
1900
x1622
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4878
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x7992
652F
Ants on a Circle
constructive algorithms
,
math
2800
x517
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1948
652D
Nested Segments
data structures
,
sortings
1800
x3789
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3085
652B
z-sort
sortings
1000
x9822
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4552
651B
Beautiful Paintings
greedy
,
sortings
1200
x11379
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x22480
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x586
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→ Pay attention
Before contest
Codeforces Round 942 (Div. 1)
05:29:33
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Before contest
Codeforces Round 942 (Div. 2)
05:29:33
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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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