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Before contest
Codeforces Round 941 (Div. 1)
12:48:38
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
12:48:38
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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
675D
Tree Construction
data structures
,
trees
1800
x3569
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3415
675B
Restoring Painting
brute force
,
constructive algorithms
,
math
1400
x7280
675A
Infinite Sequence
math
1100
x14744
673B
Problems for Round
greedy
,
implementation
1300
x3496
673A
Bear and Game
implementation
800
x9895
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17041
672A
Summer Camp
implementation
800
x14972
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
x2966
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
x3139
670D2
Magic Powder - 2
binary search
,
implementation
1500
x12959
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x15893
670C
Cinema
implementation
,
sortings
1300
x8910
670B
Game of Robots
implementation
1000
x10955
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16393
669A
Little Artem and Presents
math
800
x10530
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5451
667A
Pouring Rain
geometry
,
math
1100
x7775
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1291
666D
Chain Reaction
brute force
,
geometry
3000
x258
666C
Codeword
combinatorics
,
strings
2500
x760
666B
World Tour
graphs
,
shortest paths
2000
x2063
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
x2854
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3194
665C
Simple Strings
dp
,
greedy
,
strings
1300
x9125
665B
Shopping
brute force
1400
x3475
665A
Buses Between Cities
implementation
1600
x2859
664A
Complicated GCD
math
,
number theory
800
x17369
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
x1505
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1226
660D
Number of Parallelograms
geometry
1900
x3805
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9026
660B
Seating On Bus
implementation
1000
x5210
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8511
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
x7295
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6138
659C
Tanya and Toys
greedy
,
implementation
1200
x11377
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6176
659A
Round House
implementation
,
math
1000
x15343
658A
Bear and Reverse Radewoosh
implementation
800
x6955
656G
You're a Professional
*special problem
1900
x474
656F
Ace It!
*special problem
1900
x879
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
x3552
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x513
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
x2306
653C
Bear and Up-Down
brute force
,
implementation
1900
x1622
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4875
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x7991
652F
Ants on a Circle
constructive algorithms
,
math
2800
x516
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1946
652D
Nested Segments
data structures
,
sortings
1800
x3786
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3069
652B
z-sort
sortings
1000
x9817
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4552
651B
Beautiful Paintings
greedy
,
sortings
1200
x11375
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x22469
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x585
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1185
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1939
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3307
650A
Watchmen
data structures
,
geometry
,
math
1400
x15030
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x103
649D
Дефрагментация памяти
constructive algorithms
,
greedy
,
implementation
1600
x342
649C
Печать условий
constructive algorithms
,
greedy
,
sortings
1500
x439
649B
Этажи
constructive algorithms
1400
x518
649A
Любимые числа Поликарпа
constructive algorithms
,
implementation
1000
x1088
648E
Собери число
graphs
,
shortest paths
2300
x83
648D
Собачки и миски
data structures
,
greedy
,
sortings
1900
x221
648C
Путь Робота
constructive algorithms
,
dfs and similar
,
graphs
1100
x830
648B
Собери стол
constructive algorithms
,
sortings
800
x1199
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x571
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