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Codeforces Round (Div. 2)
3 days
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Difficulty:
—
trees
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
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1302
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8146
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10432
1662G
Gastronomic Event
dp
,
greedy
,
trees
x454
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x927
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x188
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x562
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3354
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x360
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2804
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x388
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3621
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1724
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x312
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1475
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x939
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1123
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x843
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x14214
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1533
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x584
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x983
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x2002
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1081
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x173
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x845
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1414
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1852
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3720
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7074
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9657
1610I
Mashtali vs AtCoder
games
,
trees
3100
x277
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x468
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7106
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x151
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x524
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2861
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1458
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x11965
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2187
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7747
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x173
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1030
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x318
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2177
1583B
Omkar and Heavenly Tree
constructive algorithms
,
trees
1200
x12043
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x781
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x998
1575I
Illusions of the Desert
data structures
,
trees
2300
x852
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x322
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4059
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2567
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13452
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x834
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x3925
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x677
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1782
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2917
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2515
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2664
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7574
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x145
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5888
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x514
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2527
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x14190
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1854
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8654
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1832
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x812
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x451
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1717
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22748
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x331
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1439
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1265
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x859
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x292
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1199
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2515
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x776
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2070
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x644
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1242
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x447
1481F
AB Tree
dp
,
greedy
,
trees
3100
x477
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x987
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1351
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x10979
1464F
My Beautiful Madness
data structures
,
trees
3500
x295
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1468
1458F
Range Diameter Sum
data structures
,
trees
3500
x267
1454E
Number of Simple Paths
combinatorics
,
dfs and similar
,
graphs
,
trees
2000
x5600
1453E
Dog Snacks
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1983
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x461
1450G
Communism
bitmasks
,
dp
,
trees
3500
x260
1446C
Xor Tree
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
dp
,
trees
2100
x3439
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x134
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x565
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x219
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