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Pinely Round 4 (Div. 1 + Div. 2)
14:00:35
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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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Custom test
Problems
#
Name
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x679
666E
Forensic Examination
data structures
,
string suffix structures
3100
x1362
666D
Chain Reaction
brute force
,
geometry
3000
x276
666C
Codeword
combinatorics
,
strings
2500
x775
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x595
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x135
662C
Binary Table
bitmasks
,
brute force
,
divide and conquer
,
dp
,
fft
,
math
2600
x1985
662A
Gambling Nim
bitmasks
,
math
,
matrices
,
probabilities
2400
x451
661H
Rotate Matrix
*special problem
2400
x69
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1594
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
652F
Ants on a Circle
constructive algorithms
,
math
2800
x536
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x594
650D
Zip-line
binary search
,
data structures
,
dp
,
hashing
2600
x1254
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x112
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x771
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
641F
Little Artem and 2-SAT
3000
x185
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
x839
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
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
631E
Product Sum
data structures
,
dp
,
geometry
2600
x2287
628F
Bear and Fair Set
flows
,
graphs
2500
x751
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
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
625E
Frog Fights
data structures
,
greedy
2800
x326
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x626
623E
Transforming Sequence
combinatorics
,
dp
,
fft
,
math
3300
x543
623D
Birthday
greedy
,
math
,
probabilities
2700
x471
623C
Electric Charges
binary search
,
dp
2900
x463
622F
The Sum of the k-th Powers
math
2600
x3635
621D
Rat Kwesh and Cheese
brute force
,
constructive algorithms
,
math
2400
x968
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x718
618G
Combining Slimes
dp
,
math
,
matrices
,
probabilities
3300
x232
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1346
618E
Robot Arm
data structures
,
geometry
2500
x589
616F
Expensive Strings
string suffix structures
,
strings
2700
x574
613E
Puzzle Lover
dp
,
hashing
,
strings
3200
x459
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2811
613C
Necklace
constructive algorithms
,
math
2500
x994
612F
Simba on the Circle
dp
2600
x377
611H
New Year and Forgotten Tree
constructive algorithms
,
flows
,
graphs
3200
x581
611G
New Year and Cake
geometry
,
two pointers
2900
x431
611F
New Year and Cleaning
binary search
,
implementation
2500
x462
611E
New Year and Three Musketeers
data structures
,
greedy
,
sortings
2400
x862
610E
Alphabet Permutations
data structures
,
strings
2500
x860
609F
Frogs and mosquitoes
data structures
,
greedy
2500
x1217
607E
Cross Sum
binary search
,
geometry
3300
x250
607D
Power Tree
data structures
,
trees
2600
x563
607C
Marbles
hashing
,
strings
2500
x784
605E
Intergalaxy Trips
probabilities
,
shortest paths
2700
x1364
605D
Board Game
data structures
,
dfs and similar
2500
x796
605C
Freelancer's Dreams
geometry
2400
x1109
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1213
603D
Ruminations on Ruminants
geometry
,
math
2900
x340
601E
A Museum Robbery
data structures
,
dp
2800
x854
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1103
600F
Edge coloring of bipartite graph
graphs
2800
x761
599E
Sandy and Nuts
bitmasks
,
dp
,
trees
2600
x627
598F
Cut Length
geometry
2900
x362
596E
Wilbur and Strings
dfs and similar
,
dp
,
graphs
,
strings
2500
x390
594E
Cutting the Line
string suffix structures
,
strings
3100
x158
594D
REQ
data structures
,
number theory
2500
x1572
594B
Max and Bike
binary search
,
geometry
2500
x495
593E
Strange Calculation and Cats
dp
,
matrices
2400
x586
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1220
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x213
590E
Birthday
graph matchings
,
strings
3200
x765
587F
Duff is Mad
data structures
,
strings
3000
x1013
587E
Duff as a Queen
data structures
2900
x695
587D
Duff in Mafia
2-sat
,
binary search
3100
x687
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x643
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1055
585C
Alice, Bob, Oranges and Apples
number theory
2400
x972
582E
Boolean Function
bitmasks
,
dp
,
expression parsing
3000
x482
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x614
582C
Superior Periodic Subarrays
number theory
2400
x736
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x862
581E
Kojiro and Furrari
dp
,
greedy
2800
x190
580E
Kefa and Watch
data structures
,
hashing
,
strings
2500
x2003
578F
Mirror Box
matrices
,
trees
3200
x542
578E
Walking!
constructive algorithms
,
greedy
2700
x627
578D
LCS Again
dp
,
greedy
2700
x796
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