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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
14:01:39
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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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Problems
#
Name
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x850
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1425
1614E
Divan and a Cottage
binary search
,
data structures
2600
x815
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x675
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x825
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x587
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x634
1610I
Mashtali vs AtCoder
games
,
trees
3100
x278
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x475
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x432
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x515
1609H
Pushing Robots
3500
x90
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x372
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x745
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1977
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x152
1608F
MEX counting
combinatorics
,
dp
,
implementation
3200
x575
1608E
The Cells on the Paper
binary search
,
implementation
,
sortings
2800
x431
1608D
Dominoes
combinatorics
,
fft
,
graphs
,
math
,
number theory
2400
x1367
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x540
1606D
Red-Blue Matrix
brute force
,
constructive algorithms
,
implementation
,
sortings
2400
x1416
1605F
PalindORme
combinatorics
,
dp
2900
x296
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x1017
1603F
October 18, 2017
combinatorics
,
dp
,
implementation
,
math
2700
x271
1603E
A Perfect Problem
combinatorics
,
dp
,
math
3200
x412
1603D
Artistic Partition
divide and conquer
,
dp
,
number theory
3000
x649
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x173
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x470
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1421
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x287
1599I
Desert
data structures
,
graphs
2700
x114
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x364
1599F
Mars
hashing
2700
x311
1599E
Two Arrays
data structures
,
matrices
3200
x67
1599D
Bubble Popping
3200
x30
1599B
Restaurant Game
3100
x137
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x639
1598G
The Sum of Good Numbers
hashing
,
math
,
string suffix structures
,
strings
3200
x328
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1398
1594F
Ideal Farm
constructive algorithms
,
math
2400
x1282
1592F2
Alice and Recoloring 2
constructive algorithms
,
flows
,
graph matchings
,
greedy
2800
x699
1592F1
Alice and Recoloring 1
constructive algorithms
,
greedy
2600
x807
1592E
Bored Bakry
bitmasks
,
greedy
,
math
,
two pointers
2400
x1573
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x275
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x191
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x175
1585F
Non-equal Neighbours
combinatorics
,
dp
,
math
2400
x1187
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1037
1584G
Eligible Segments
geometry
3200
x205
1584F
Strange LCS
bitmasks
,
dp
,
graphs
,
greedy
,
strings
2600
x905
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x319
1583G
Omkar and Time Travel
data structures
,
math
3000
x433
1583F
Defender of Childhood Dreams
bitmasks
,
constructive algorithms
,
divide and conquer
2500
x1258
1582G
Kuzya and Homework
data structures
,
number theory
2600
x575
1582F2
Korney Korneevich and XOR (hard version)
binary search
,
brute force
,
dp
,
greedy
,
two pointers
2400
x1758
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x131
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x72
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x837
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x1006
1578M
The Mind
constructive algorithms
,
interactive
,
probabilities
2700
x441
1578L
Labyrinth
binary search
,
dsu
,
greedy
2400
x1074
1578K
Kingdom of Islands
brute force
,
graphs
,
implementation
2800
x348
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x225
1578I
Interactive Rays
geometry
,
interactive
3300
x59
1578G
Game of Chance
math
,
probabilities
3500
x36
1578F
Framing Pictures
geometry
2900
x148
1578D
Dragon Curve
3200
x44
1578C
Cactus Lady and her Cing
3500
x9
1578B
Building Forest Trails
data structures
,
dsu
2800
x329
1578A
Anti-Tetris
constructive algorithms
,
graphs
,
shortest paths
2800
x337
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x244
1575F
Finding Expected Value
math
2900
x112
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x323
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x159
1574F
Occurrences
combinatorics
,
dfs and similar
,
dp
,
dsu
,
fft
,
graphs
2700
x597
1574E
Coloring
combinatorics
,
constructive algorithms
,
implementation
,
math
2500
x888
1572F
Stations
data structures
3400
x253
1572E
Polygon
binary search
,
dp
,
geometry
3000
x283
1572D
Bridge Club
flows
,
graph matchings
,
graphs
,
greedy
2800
x488
1572C
Paint
dp
,
greedy
2700
x1418
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1779
1571J
Two Railroads
*special problem
3000
x40
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x58
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x48
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x75
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x234
1569E
Playoff Restoration
bitmasks
,
brute force
,
hashing
,
implementation
,
meet-in-the-middle
2600
x792
1567F
One-Four Overload
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
2700
x736
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x129
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x339
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x942
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x388
1562E
Rescue Niwen!
dp
,
greedy
,
string suffix structures
,
strings
2500
x1380
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2590
1558F
Strange Sort
data structures
,
sortings
3300
x373
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x461
1558D
Top-Notch Insertions
combinatorics
,
data structures
2600
x943
1557E
Assiut Chess
brute force
,
constructive algorithms
,
interactive
2800
x707
1556H
DIY Tree
graphs
,
greedy
,
math
,
probabilities
3300
x362
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x315
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