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Pinely Round 4 (Div. 1 + Div. 2)
14:08:26
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combine-tags-by-or
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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
1656F
Parametric MST
binary search
,
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
2600
x1019
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3372
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x73
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x365
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1091
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x2034
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2812
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x372
1651E
Sum of Matchings
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
greedy
,
math
2600
x511
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2375
1650F
Vitaly and Advanced Useless Algorithms
dp
,
greedy
,
implementation
2200
x1415
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x109
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x390
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x825
1647F
Madoka and Laziness
dp
,
greedy
3100
x381
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x972
1646F
Playing Around the Table
constructive algorithms
,
greedy
,
implementation
2900
x514
1646E
Power Board
brute force
,
dp
,
math
,
number theory
2200
x2345
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3652
1644F
Basis
combinatorics
,
fft
,
math
,
number theory
2900
x320
1641F
Covering Circle
geometry
3500
x97
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x205
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1072
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2377
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3766
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x217
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1851
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4133
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x310
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x498
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1730
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3232
1635F
Closest Pair
data structures
,
greedy
2800
x996
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2195
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1576
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1647
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4299
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x315
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1484
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x951
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1136
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4573
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x534
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x433
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1565
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2897
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x86
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x854
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x2021
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3079
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3128
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x562
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2304
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x723
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1542
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3864
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x586
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x1019
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x2017
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3240
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x4029
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1087
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1358
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x610
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1871
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3956
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x113
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x175
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x639
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x547
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1740
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x4006
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x875
1620F
Bipartite Array
dp
,
greedy
2800
x596
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4119
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1111
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2356
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x2067
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1525
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4147
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x854
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1750
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x841
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x271
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x588
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2459
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4815
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x322
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x149
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x850
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1425
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1863
1614E
Divan and a Cottage
binary search
,
data structures
2600
x815
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2262
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3783
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x675
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5082
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x825
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x587
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2440
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