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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
06:08:27
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Difficulty:
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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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Status
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Custom test
Problems
#
Name
685D
Kay and Eternity
brute force
,
implementation
,
sortings
2600
x480
685C
Optimal Point
binary search
,
math
2900
x577
683J
The Hero with Bombs
*special problem
3000
x40
683I
Loader
*special problem
,
graphs
2500
x38
682E
Alyona and Triangles
geometry
,
two pointers
2600
x661
681E
Runaway to a Shadow
geometry
,
sortings
2500
x457
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1733
679E
Bear and Bad Powers of 42
data structures
3100
x677
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x313
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1145
679B
Bear and Tower of Cubes
binary search
,
dp
,
greedy
2200
x2122
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x861
678E
Another Sith Tournament
bitmasks
,
dp
,
math
,
probabilities
2200
x2138
677E
Vanya and Balloons
binary search
,
brute force
,
dp
,
implementation
2300
x595
677D
Vanya and Treasure
data structures
,
dp
,
graphs
,
shortest paths
2300
x1550
676E
The Last Fight Between Human and AI
math
2400
x885
676D
Theseus and labyrinth
graphs
,
implementation
,
shortest paths
2000
x1856
675E
Trains and Statistic
data structures
,
dp
,
greedy
2300
x2663
675C
Money Transfers
constructive algorithms
,
data structures
,
greedy
,
sortings
2100
x3621
671E
Organizing a Race
data structures
,
greedy
3300
x403
671D
Roads in Yusland
data structures
,
dp
,
greedy
2900
x1130
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x679
671B
Robin Hood
binary search
,
greedy
2000
x2988
670F
Restore a Number
brute force
,
constructive algorithms
,
strings
2300
x848
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1362
666D
Chain Reaction
brute force
,
geometry
3000
x276
666C
Codeword
combinatorics
,
strings
2500
x775
666B
World Tour
graphs
,
shortest paths
2000
x2127
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x595
665E
Beautiful Subarrays
data structures
,
divide and conquer
,
strings
,
trees
2100
x2992
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x135
662D
International Olympiad
constructive algorithms
,
greedy
,
implementation
,
math
2000
x1622
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1985
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1453
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x451
661H
Rotate Matrix
*special problem
2400
x69
661G
Hungarian Notation
*special problem
2200
x56
661E
Divisibility Check
*special problem
2000
x84
661D
Maximal Difference
*special problem
2100
x131
661C
Array Sum
*special problem
2000
x132
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1594
660E
Different Subsets For All Tuples
combinatorics
,
math
2300
x1324
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x1143
659F
Polycarp and Hay
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2000
x1763
656E
Out of Controls
*special problem
2000
x721
656D
Rosetta Problem
*special problem
2100
x949
656C
Without Text
*special problem
2000
x684
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x524
653F
Paper task
data structures
,
string suffix structures
,
strings
2600
x979
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1469
653D
Delivery Bears
binary search
,
flows
,
graphs
2200
x2381
652F
Ants on a Circle
constructive algorithms
,
math
2800
x536
652E
Pursuit For Artifacts
dfs and similar
,
dsu
,
graphs
,
trees
2300
x2063
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x594
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1254
650C
Table Compression
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2200
x1958
649E
Автобус
binary search
,
data structures
,
greedy
,
sortings
2100
x107
648E
Собери число
graphs
,
shortest paths
2300
x123
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x112
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x771
645E
Intellectual Inquiry
dp
,
greedy
,
strings
2200
x1233
644C
Hostname Aliases
*special problem
,
binary search
,
data structures
,
implementation
,
sortings
,
strings
2100
x912
643G
Choosing Ads
data structures
3200
x947
643F
Bears and Juice
dp
,
math
,
meet-in-the-middle
2900
x697
643E
Bear and Destroying Subtrees
dp
,
math
,
probabilities
,
trees
2700
x587
643D
Bearish Fanpages
2900
x312
643C
Levels and Regions
dp
2400
x1338
641G
Little Artem and Graph
2300
x89
641F
Little Artem and 2-SAT
3000
x185
641E
Little Artem and Time Machine
data structures
2000
x3029
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1101
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x415
639E
Bear and Paradox
binary search
,
greedy
,
math
,
sortings
2800
x574
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x851
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1191
633H
Fibonacci-ish II
data structures
,
implementation
3100
x587
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x768
633F
The Chocolate Spree
dfs and similar
,
dp
,
graphs
,
trees
2600
x953
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x581
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2766
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1056
632E
Thief in a Shop
divide and conquer
,
dp
,
fft
,
math
2400
x2664
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3670
631E
Product Sum
data structures
,
dp
,
geometry
2600
x2287
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2020
630P
Area of a Star
geometry
2100
x1098
630O
Arrow
geometry
2000
x749
629E
Famil Door and Roads
combinatorics
,
data structures
,
dfs and similar
,
dp
,
probabilities
,
trees
2300
x975
629D
Babaei and Birthday Cake
data structures
,
dp
2000
x3952
629C
Famil Door and Brackets
dp
,
strings
2000
x2766
628F
Bear and Fair Set
flows
,
graphs
2500
x751
628E
Zbazi in Zeydabad
data structures
,
implementation
2300
x873
628D
Magic Numbers
dp
2200
x5729
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x236
627E
Orchestra
two pointers
3000
x547
627D
Preorder Test
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x810
627C
Package Delivery
data structures
,
divide and conquer
,
greedy
2200
x1158
626G
Raffles
data structures
,
dp
,
greedy
,
math
3100
x523
626F
Group Projects
dp
2400
x2750
626E
Simple Skewness
binary search
,
math
,
ternary search
2400
x1308
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