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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
38:43:17
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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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Problems
#
Name
672A
Summer Camp
implementation
800
x14963
671E
Organizing a Race
data structures
,
greedy
3300
x392
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1104
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x659
671B
Robin Hood
binary search
,
greedy
2000
x2962
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4104
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x846
670E
Correct Bracket Sequence Editor
data structures
,
dsu
,
strings
1700
x3138
670D2
Magic Powder - 2
binary search
,
implementation
1500
x12916
670D1
Magic Powder - 1
binary search
,
brute force
,
implementation
1400
x15845
670C
Cinema
implementation
,
sortings
1300
x8906
670B
Game of Robots
implementation
1000
x10944
670A
Holidays
brute force
,
constructive algorithms
,
greedy
,
math
900
x16374
669A
Little Artem and Presents
math
800
x10520
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5448
667A
Pouring Rain
geometry
,
math
1100
x7774
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1286
666D
Chain Reaction
brute force
,
geometry
3000
x257
666C
Codeword
combinatorics
,
strings
2500
x757
666B
World Tour
graphs
,
shortest paths
2000
x2056
666A
Reberland Linguistics
dp
,
implementation
,
strings
1800
x3412
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x574
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2848
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3184
665C
Simple Strings
dp
,
greedy
,
strings
1300
x9092
665B
Shopping
brute force
1400
x3474
665A
Buses Between Cities
implementation
1600
x2857
664A
Complicated GCD
math
,
number theory
800
x17324
663A
Rebus
constructive algorithms
,
expression parsing
,
greedy
,
math
1800
x3241
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x129
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1615
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1935
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1434
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x428
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
x1500
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1224
660D
Number of Parallelograms
geometry
1900
x3799
660C
Hard Process
binary search
,
dp
,
two pointers
1600
x9011
660B
Seating On Bus
implementation
1000
x5206
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8503
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x946
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1747
659E
New Reform
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7290
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6133
659C
Tanya and Toys
greedy
,
implementation
1200
x11373
659B
Qualifying Contest
constructive algorithms
,
sortings
1300
x6175
659A
Round House
implementation
,
math
1000
x15318
658A
Bear and Reverse Radewoosh
implementation
800
x6949
656G
You're a Professional
*special problem
1900
x473
656F
Ace It!
*special problem
1900
x877
656E
Out of Controls
*special problem
2000
x715
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
x512
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x947
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1373
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2302
653C
Bear and Up-Down
brute force
,
implementation
1900
x1622
653B
Bear and Compressing
brute force
,
dfs and similar
,
dp
,
strings
1300
x4862
653A
Bear and Three Balls
brute force
,
implementation
,
sortings
900
x7990
652F
Ants on a Circle
constructive algorithms
,
math
2800
x515
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1943
652D
Nested Segments
data structures
,
sortings
1800
x3780
652C
Foe Pairs
combinatorics
,
sortings
,
two pointers
1800
x3065
652B
z-sort
sortings
1000
x9803
652A
Gabriel and Caterpillar
implementation
,
math
1400
x4547
651B
Beautiful Paintings
greedy
,
sortings
1200
x11365
651A
Joysticks
dp
,
greedy
,
implementation
,
math
1100
x22436
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x583
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1182
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1937
650B
Image Preview
binary search
,
brute force
,
dp
,
two pointers
1900
x3306
650A
Watchmen
data structures
,
geometry
,
math
1400
x15012
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
x438
649B
Этажи
constructive algorithms
1400
x518
649A
Любимые числа Поликарпа
constructive algorithms
,
implementation
1000
x1082
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
x826
648B
Собери стол
constructive algorithms
,
sortings
800
x1189
648A
Наибольший подъем
constructive algorithms
,
implementation
900
x568
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x110
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x756
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1213
645D
Robot Rapping Results Report
binary search
,
dp
,
graphs
1800
x2698
645C
Enduring Exodus
binary search
,
two pointers
1600
x3142
645B
Mischievous Mess Makers
greedy
,
math
1200
x3329
645A
Amity Assessment
brute force
,
constructive algorithms
,
implementation
1200
x3351
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