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Before contest
Pinely Round 4 (Div. 1 + Div. 2)
34:15:30
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Difficulty:
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dfs and similar
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
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x80
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x106
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x109
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x135
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x152
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x159
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x175
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x188
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x191
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x271
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x110
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x124
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x140
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x161
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x172
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x186
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x236
627F
Island Puzzle
dfs and similar
,
dsu
,
graphs
,
trees
3400
x236
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x372
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x98
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x147
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x205
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x263
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x413
1307F
Cow and Vacation
dfs and similar
,
dsu
,
trees
3300
x576
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x275
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x309
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x347
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x386
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x390
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x402
650E
Clockwork Bomb
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
3200
x594
538H
Summer Dichotomy
2-sat
,
data structures
,
dfs and similar
,
greedy
3200
x634
487E
Tourists
data structures
,
dfs and similar
,
graphs
,
trees
3200
x2248
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x180
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x225
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x331
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x475
521E
Cycling City
dfs and similar
,
graphs
3100
x964
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1096
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x169
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x173
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x189
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x234
1989F
Simultaneous Coloring
dfs and similar
,
divide and conquer
,
graphs
3000
x319
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x342
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x381
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x425
1178G
The Awesomest Vertex
data structures
,
dfs and similar
3000
x433
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x442
1558E
Down Below
binary search
,
dfs and similar
,
graphs
,
greedy
,
meet-in-the-middle
,
shortest paths
3000
x461
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x504
1610F
Mashtali: a Space Oddysey
constructive algorithms
,
dfs and similar
,
graphs
3000
x515
1552G
A Serious Referee
bitmasks
,
brute force
,
dfs and similar
,
sortings
3000
x519
1534F2
Falling Sand (Hard Version)
dfs and similar
,
dp
,
graphs
,
greedy
3000
x529
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x547
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x568
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x598
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x667
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x690
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x710
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x803
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x891
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x89
1218H
Function Composition
dfs and similar
2900
x110
1510C
Cactus Not Enough
dfs and similar
,
graph matchings
,
graphs
2900
x211
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x219
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x245
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x246
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x313
687E
TOF
dfs and similar
,
graphs
2900
x316
1266F
Almost Same Distance
dfs and similar
,
graphs
2900
x333
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x335
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x365
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x439
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x468
1392G
Omkar and Pies
bitmasks
,
dfs and similar
,
dp
,
math
,
shortest paths
2900
x473
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x556
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x572
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x650
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x702
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1750
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2549
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x130
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x240
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x339
240E
Road Repairs
dfs and similar
,
graphs
,
greedy
2800
x355
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x379
1721F
Matching Reduction
brute force
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
,
interactive
2800
x385
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x390
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x406
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x425
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x435
1685D1
Permutation Weight (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
2800
x436
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x477
1419F
Rain of Fire
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
2800
x487
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x491
1477D
Nezzar and Hidden Permutations
constructive algorithms
,
dfs and similar
,
graphs
2800
x539
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x553
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x566
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