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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
06:11:39
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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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Custom test
Problems
#
Name
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x816
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1191
827F
Dirty Arkady's Kitchen
data structures
,
dp
,
graphs
,
shortest paths
3200
x392
827E
Rusty String
fft
,
math
,
strings
2700
x862
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1090
827C
DNA Evolution
data structures
,
strings
2100
x1626
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1166
825F
String Compression
dp
,
hashing
,
string suffix structures
,
strings
2400
x1402
825E
Minimal Labels
data structures
,
dfs and similar
,
graphs
,
greedy
2300
x3300
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x290
822E
Liar
binary search
,
dp
,
hashing
,
string suffix structures
2400
x802
821E
Okabe and El Psy Kongroo
dp
,
matrices
2100
x1444
821D
Okabe and City
dfs and similar
,
graphs
,
shortest paths
2200
x1375
819E
Mister B and Flight to the Moon
constructive algorithms
,
graphs
2800
x507
819D
Mister B and Astronomers
number theory
2900
x224
819C
Mister B and Beacons on Field
number theory
2900
x206
819A
Mister B and Boring Game
games
,
greedy
2200
x486
818G
Four Melodies
flows
,
graphs
2600
x653
818F
Level Generation
binary search
,
math
,
ternary search
2100
x1513
818C
Sofa Thief
brute force
,
implementation
2000
x1224
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2505
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2778
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x221
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x606
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2558
815B
Karen and Test
brute force
,
combinatorics
,
constructive algorithms
,
math
2200
x1369
814E
An unavoidable detour for home
combinatorics
,
dp
,
graphs
,
shortest paths
2600
x645
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2189
813F
Bipartite Checking
data structures
,
dsu
,
graphs
2500
x1263
813E
Army Creation
binary search
,
data structures
2200
x2341
813D
Two Melodies
dp
,
flows
2600
x1012
812E
Sagheer and Apple Tree
games
,
trees
2300
x1045
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x329
811E
Vladik and Entertaining Flags
data structures
,
dsu
,
graphs
2600
x855
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1749
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x728
809D
Hitchhiking in the Baltic States
data structures
,
dp
2900
x817
809C
Find a car
combinatorics
,
divide and conquer
,
dp
2600
x736
809B
Glad to see you!
binary search
,
interactive
2200
x1649
808G
Anthem of Berland
dp
,
strings
2300
x2546
808F
Card Game
binary search
,
flows
,
graphs
2400
x1136
808E
Selling Souvenirs
binary search
,
dp
,
greedy
,
ternary search
2300
x1794
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x161
804E
The same permutation
constructive algorithms
3100
x412
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1266
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1833
803G
Periodic RMQ Problem
data structures
2300
x1381
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3126
803E
Roma and Poker
dp
,
graphs
2000
x2148
802O
April Fools' Problem (hard)
binary search
,
data structures
,
flows
2900
x896
802N
April Fools' Problem (medium)
binary search
,
flows
,
graphs
2400
x1157
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x295
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x625
802I
Fake News (hard)
string suffix structures
2300
x1464
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x436
802F
Marmots (hard)
math
,
probabilities
2800
x121
802E
Marmots (medium)
math
2200
x241
802D
Marmots (easy)
math
2100
x443
802C
Heidi and Library (hard)
flows
2600
x549
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x114
799F
Beautiful fountains rows
data structures
3500
x430
799E
Aquarium decoration
data structures
,
greedy
,
two pointers
2500
x928
799D
Field expansion
brute force
,
dp
,
meet-in-the-middle
2100
x2010
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x469
798D
Mike and distribution
constructive algorithms
,
sortings
2400
x1872
797F
Mice and Holes
data structures
,
dp
,
greedy
,
sortings
2600
x1155
797E
Array Queries
brute force
,
data structures
,
dp
2000
x4214
797D
Broken BST
data structures
,
dfs and similar
2100
x1789
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x176
796E
Exam Cheating
binary search
,
dp
2400
x647
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5487
794G
Replace All
combinatorics
,
dp
,
math
3400
x332
794F
Leha and security system
data structures
2800
x802
794E
Choosing Carrot
games
,
math
2800
x783
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x802
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x374
793F
Julia the snail
data structures
,
divide and conquer
,
dp
3000
x539
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x245
793D
Presents in Bankopolis
dp
,
graphs
,
shortest paths
2100
x1588
793C
Mice problem
geometry
,
implementation
,
math
,
sortings
2300
x1241
792F
Mages and Monsters
data structures
,
geometry
3100
x202
792E
Colored Balls
greedy
,
math
,
number theory
2500
x1062
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4314
788E
New task
data structures
2900
x334
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x362
788C
The Great Mixing
dfs and similar
,
graphs
,
shortest paths
2300
x2198
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2501
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x610
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x140
786C
Till I Collapse
data structures
,
divide and conquer
2400
x2712
786B
Legacy
data structures
,
graphs
,
shortest paths
2300
x5775
786A
Berzerk
dfs and similar
,
dp
,
games
2000
x2515
785E
Anton and Permutation
brute force
,
data structures
2200
x1859
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2749
784G
BF Calculator
*special problem
2000
x738
784E
Twisted Circuit
*special problem
,
brute force
,
implementation
2000
x1925
784B
Kids' Riddle
*special problem
2000
x853
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x118
780G
Andryusha and Nervous Barriers
data structures
,
dp
2700
x652
780F
Axel and Marston in Bitland
bitmasks
,
dp
,
graphs
,
matrices
2400
x1033
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