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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
25:16:32
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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
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1886
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x321
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3625
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x676
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1031
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x992
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3078
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x754
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x389
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x401
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x211
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x710
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1206
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x589
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x783
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x802
1777E
Edge Reverse
binary search
,
dfs and similar
,
graphs
,
trees
2200
x1647
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3145
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x320
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x323
1774E
Two Chess Pieces
dfs and similar
,
dp
,
greedy
,
trees
1900
x3283
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x718
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x936
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2562
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1283
1767F
Two Subtrees
data structures
,
trees
3100
x241
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x815
1764F
Doremy's Experimental Tree
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
sortings
,
trees
2500
x865
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x411
1762E
Tree Sum
combinatorics
,
math
,
trees
2600
x582
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x95
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1701
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x462
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1678
1746D
Paths on the Tree
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1900
x4361
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14191
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x197
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4053
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4785
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1135
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3283
1726D
Edge Split
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
probabilities
,
trees
2000
x3510
1725J
Journey
dp
,
trees
2500
x352
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x177
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x425
1721E
Prefix Function Queries
dfs and similar
,
dp
,
hashing
,
string suffix structures
,
strings
,
trees
2200
x1785
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1708
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5657
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x283
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x6998
1714F
Build a Tree and That Is It
constructive algorithms
,
implementation
,
trees
1900
x3022
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x299
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x403
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x520
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2363
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x550
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1359
1706E
Qpwoeirut and Vertices
binary search
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
greedy
,
trees
2300
x2319
1702G2
Passable Paths (hard version)
data structures
,
dfs and similar
,
trees
2000
x4211
1702G1
Passable Paths (easy version)
dfs and similar
,
trees
1900
x5037
1698E
PermutationForces II
brute force
,
combinatorics
,
greedy
,
sortings
,
trees
,
two pointers
2300
x1558
1696F
Tree Recovery
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x826
1695D2
Tree Queries (Hard Version)
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x1893
1695D1
Tree Queries (Easy Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2200
x2061
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x7978
1691F
K-Set Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2500
x895
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x10320
1682E
Unordered Swaps
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
,
trees
2700
x552
1682D
Circular Spanning Tree
constructive algorithms
,
implementation
,
trees
2000
x3144
1681F
Unique Occurrences
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2300
x1514
1680F
Lenient Vertex Cover
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
trees
2600
x611
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x13725
1675F
Vlad and Unfinished Business
dfs and similar
,
dp
,
greedy
,
trees
1800
x4921
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x12418
1671E
Preorder
combinatorics
,
divide and conquer
,
dp
,
dsu
,
hashing
,
sortings
,
trees
2100
x2618
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1653
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x626
1666J
Job Lookup
constructive algorithms
,
dp
,
shortest paths
,
trees
2100
x1275
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x7964
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10176
1662G
Gastronomic Event
dp
,
greedy
,
trees
x438
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x903
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x176
1657F
Words on Tree
2-sat
,
dfs and similar
,
dsu
,
graphs
,
trees
2600
x535
1656E
Equal Tree Sums
constructive algorithms
,
dfs and similar
,
math
,
trees
2200
x3255
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x349
1654D
Potion Brewing Class
dfs and similar
,
math
,
number theory
,
trees
2100
x2761
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x379
1646D
Weight the Tree
constructive algorithms
,
dfs and similar
,
dp
,
implementation
,
trees
2000
x3492
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1669
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x301
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1453
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x915
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1097
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x814
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x13896
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1501
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x571
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x969
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1946
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