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Codeforces Round 973 (Div. 2)
13:57:20
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Difficulty:
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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
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x868
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1987
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2164
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x8417
1691F
K-Set Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2500
x962
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x11159
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x594
1682D
Circular Spanning Tree
constructive algorithms
,
implementation
,
trees
2000
x3295
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1733
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x661
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x15521
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x5292
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x12989
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2736
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1740
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x660
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1327
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8340
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10482
1662G
Gastronomic Event
dp
,
greedy
,
trees
x467
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x945
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x191
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x574
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3434
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x393
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2837
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x396
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3716
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1763
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x318
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1519
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x973
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1154
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x880
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x14456
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1564
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x594
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x1038
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x2045
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1096
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x178
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x864
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1467
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1884
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3807
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7246
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9822
1610I
Mashtali vs AtCoder
games
,
trees
3100
x283
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x492
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x7275
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x157
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x557
1605D
Treelabeling
bitmasks
,
constructive algorithms
,
dfs and similar
,
games
,
greedy
,
implementation
,
trees
2100
x2922
1594E2
Rubik's Cube Coloring (hard version)
brute force
,
dp
,
implementation
,
math
,
trees
2300
x1478
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x12326
1592D
Hemose in ICPC ?
binary search
,
dfs and similar
,
implementation
,
interactive
,
math
,
number theory
,
trees
2300
x2221
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7935
1585G
Poachers
dp
,
games
,
graphs
,
trees
2500
x181
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1050
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x323
1583E
Moment of Bloom
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
greedy
,
trees
2200
x2210
1583B
Omkar and Heavenly Tree
constructive algorithms
,
trees
1200
x12190
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x872
1580B
Mathematics Curriculum
brute force
,
combinatorics
,
dp
,
trees
2600
x1034
1575I
Illusions of the Desert
data structures
,
trees
2300
x884
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x329
1566E
Buds Re-hanging
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x4110
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2630
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13751
1555F
Good Graph
data structures
,
dsu
,
graphs
,
trees
2700
x851
1555E
Boring Segments
data structures
,
sortings
,
trees
,
two pointers
2100
x4022
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x700
1551F
Equidistant Vertices
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2200
x1831
1547G
How Many Paths?
dfs and similar
,
dp
,
graphs
,
trees
2100
x2986
1540B
Tree Array
brute force
,
combinatorics
,
dp
,
graphs
,
math
,
probabilities
,
trees
2300
x2586
1535E
Gold Transfer
binary search
,
data structures
,
dp
,
greedy
,
interactive
,
trees
2200
x2743
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7701
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x149
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x6012
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x522
1528C
Trees of Tranquillity
data structures
,
dfs and similar
,
greedy
,
trees
2300
x2632
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x14624
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1901
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8731
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1934
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x819
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x459
1515F
Phoenix and Earthquake
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2600
x1768
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x23593
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x346
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1485
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1320
1498F
Christmas Game
bitmasks
,
data structures
,
dfs and similar
,
dp
,
games
,
math
,
trees
2500
x911
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x294
1495D
BFS Trees
combinatorics
,
dfs and similar
,
graphs
,
math
,
shortest paths
,
trees
2600
x1315
1494D
Dogeforces
constructive algorithms
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
sortings
,
trees
2300
x2559
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x807
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2147
1486F
Pairs of Paths
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2600
x653
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1289
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