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Problems
#
Name
2219C
Coloring a Red Black Tree
dfs and similar
,
dp
,
greedy
,
math
,
probabilities
,
trees
,
trees
x1112
2217H
Closer
dfs and similar
,
dp
,
trees
2800
x176
2208D2
Tree Orientation (Hard Version)
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2200
x1785
2208D1
Tree Orientation (Easy Version)
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
1800
x4111
2207G
Toothless
constructive algorithms
,
dfs and similar
,
dsu
3300
x148
2207D
Boxed Like a Fish
dfs and similar
,
dp
,
games
,
shortest paths
,
trees
2200
x2076
2206C
Upside Down Dijkstra
dfs and similar
2200
x599
2204D
Alternating Path
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
graphs
,
graphs
,
graphs
1400
x8687
2196C2
Interactive Graph (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
graphs
,
interactive
2000
x2490
2196C1
Interactive Graph (Simple Version)
binary search
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
interactive
1800
x3558
2195E
Idiot First Search
dfs and similar
,
dp
,
trees
1500
x8421
2194F2
Again Trees... (hard version)
bitmasks
,
data structures
,
dfs and similar
,
dp
,
fft
,
trees
3000
x166
2194F1
Again Trees... (Easy Version)
bitmasks
,
dfs and similar
,
dp
,
trees
2300
x879
2193H
Remove the Grail Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
implementation
,
trees
2400
x1034
2193G
Paths in a Tree
dfs and similar
,
interactive
,
sortings
,
trees
2100
x2213
2192E
Swap to Rearrange
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
graphs
,
graphs
,
greedy
,
strings
2100
x2035
2189F
Zhora the Vacuum Cleaner
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
,
trees
2800
x222
2187C
Jerry and Tom
data structures
,
dfs and similar
,
dsu
,
games
,
graphs
,
greedy
,
trees
2300
x1351
2184F
Cherry Tree
dfs and similar
,
dp
,
graphs
,
trees
1900
x3842
2184C
Huge Pile
binary search
,
dfs and similar
,
dp
,
graphs
,
math
1100
x21702
2183F
Jumping Man
brute force
,
combinatorics
,
dfs and similar
,
dp
,
trees
2500
x1112
2183D2
Tree Coloring (Hard Version)
combinatorics
,
constructive algorithms
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
2100
x2489
2183D1
Tree Coloring (Easy Version)
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x8784
2182G
Short Garland
combinatorics
,
data structures
,
dfs and similar
,
dp
,
trees
2800
x347
2176E
Remove at the lowest cost
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2400
x1255
2174E2
Game of Scientists (Version 2)
binary search
,
chinese remainder theorem
,
dfs and similar
,
interactive
,
math
3200
x95
2167F
Tree, TREE!!!
dfs and similar
,
dp
,
math
,
trees
1600
x7087
2164F2
Chain Prefix Rank (Hard Version)
binary search
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
math
,
trees
2900
x420
2164F1
Chain Prefix Rank (Easy Version)
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2600
x647
2164E
Journey
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2300
x1571
2157H
Keygen 3
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
3200
x115
2157G
Isaac's Queries
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
interactive
,
math
,
probabilities
2800
x406
2155F
Juan's Colorful Tree
data structures
,
dfs and similar
,
dfs and similar
,
dsu
,
graphs
,
graphs
,
meet-in-the-middle
,
trees
2800
x634
2154D
Catshock
constructive algorithms
,
dfs and similar
,
graphs
,
trees
,
two pointers
1900
x4746
2152H1
Victorious Coloring (Easy Version)
dfs and similar
,
dp
,
greedy
2900
x592
2145F
Long Journey
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
greedy
,
math
,
matrices
,
number theory
2500
x979
2145D
Inversion Value of a Permutation
constructive algorithms
,
dfs and similar
,
dp
1800
x6651
2143C
Max Tree
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
1300
x14051
2141H
Merging Vertices in a Graph
*special problem
,
dfs and similar
,
dsu
,
graphs
2700
x83
2138C2
Maple and Tree Beauty (Hard Version)
bitmasks
,
brute force
,
dfs and similar
,
dp
,
fft
,
trees
2000
x3352
2138C1
Maple and Tree Beauty (Easy Version)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1800
x5405
2137G
Cry Me a River
dfs and similar
,
dp
,
games
,
graphs
2200
x1924
2135C
By the Assignment
binary search
,
bitmasks
,
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
math
2000
x3867
2134D
Sliding Tree
constructive algorithms
,
dfs and similar
,
greedy
,
implementation
,
trees
2300
x3630
2133E
I Yearned For The Mines
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1676
2132F
Rada and the Chamomile Valley
dfs and similar
,
graphs
,
shortest paths
2100
x2755
2131G
Wafu!
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dp
,
math
2000
x3751
2127H
23 Rises Again
brute force
,
dfs and similar
,
dp
,
flows
,
graph matchings
,
graphs
,
greedy
,
implementation
,
probabilities
,
trees
3100
x567
2127E
Ancient Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2100
x2727
2127D
Root was Built by Love, Broken by Destiny
combinatorics
,
dfs and similar
,
graphs
,
trees
1800
x6169
2126F
1-1-1, Free Tree!
brute force
,
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2000
x4277
2119F
Volcanic Eruptions
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
3300
x171
2118D2
Red Light, Green Light (Hard version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
implementation
,
math
,
number theory
2200
x2488
2118D1
Red Light, Green Light (Easy version)
brute force
,
dfs and similar
,
dp
,
graphs
,
implementation
,
number theory
1700
x8412
2117F
Wildflower
combinatorics
,
dfs and similar
,
trees
1800
x5917
2115B
Gellyfish and Camellia Japonica
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2100
x3951
2114F
Small Operations
binary search
,
brute force
,
dfs and similar
,
dp
,
math
,
number theory
,
sortings
2000
x5487
2114E
Kirei Attacks the Estate
dfs and similar
,
dp
,
greedy
,
trees
1400
x13958
2113F
Two Arrays
constructive algorithms
,
dfs and similar
,
graphs
,
math
2500
x948
2113E
From Kazan with Love
dfs and similar
,
graphs
,
implementation
,
trees
2800
x405
2112E
Tree Colorings
combinatorics
,
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2200
x3333
2112D
Reachability and Tree
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9404
2110E
Melody
dfs and similar
,
graphs
,
implementation
2300
x2674
2110D
Fewer Batteries
binary search
,
dfs and similar
,
dp
,
graphs
,
greedy
,
hashing
1700
x8558
2109F
Penguin Steps
binary search
,
dfs and similar
,
flows
,
graphs
,
shortest paths
3000
x272
2109D
D/D/D
dfs and similar
,
graphs
,
greedy
,
shortest paths
1900
x5584
2108E
Spruce Dispute
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
shortest paths
,
trees
2600
x879
2107D
Apple Tree Traversing
brute force
,
dfs and similar
,
greedy
,
implementation
,
trees
2100
x3534
2106G2
Baudelaire (hard version)
binary search
,
dfs and similar
,
divide and conquer
,
implementation
,
interactive
,
trees
2500
x607
2106F
Goblin
dfs and similar
,
dp
,
dsu
,
greedy
,
math
1900
x4414
2104F
Numbers and Strings
binary search
,
brute force
,
dfs and similar
,
dp
,
implementation
,
math
2600
x711
2103D
Local Construction
constructive algorithms
,
dfs and similar
,
implementation
,
two pointers
2000
x3970
2097E
Clearing the Snowdrift
data structures
,
dfs and similar
,
dp
,
greedy
3100
x275
2097B
Baggage Claim
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
math
,
trees
2300
x1902
2093G
Shorten the Array
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
,
two pointers
1900
x3785
2086E
Zebra-like Numbers
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
math
2400
x1659
2086C
Disappearing Permutation
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
implementation
1300
x16084
2077G
RGB Walking
bitmasks
,
chinese remainder theorem
,
dfs and similar
,
graphs
,
number theory
3500
x133
2071C
Trapmigiano Reggiano
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1700
x9639
2070D
Tree Jumps
dfs and similar
,
dp
,
trees
1600
x11021
2069F
Graph Inclusion
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
2800
x758
2068E
Porto Vs. Benfica
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2800
x365
2067C
Devyatkino
brute force
,
dfs and similar
,
greedy
,
math
1500
x12663
2065F
Skibidus and Slay
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1700
x7070
2063F2
Counting Is Not Fun (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
trees
2700
x924
2063F1
Counting Is Not Fun (Easy Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
hashing
,
implementation
,
math
,
trees
2400
x1521
2063E
Triangle Tree
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
2300
x2348
2063C
Remove Exactly Two
brute force
,
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x14559
2062E2
The Game (Hard Version)
data structures
,
dfs and similar
,
games
,
graphs
,
implementation
,
trees
3000
x445
2062E1
The Game (Easy Version)
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
trees
2000
x4316
2062D
Balanced Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2200
x3535
2060E
Graph Composition
dfs and similar
,
dsu
,
graphs
,
greedy
1500
x12200
2057G
Secret Message
constructive algorithms
,
dfs and similar
,
math
3000
x721
2057E2
Another Exercise on Graphs (hard version)
binary search
,
dfs and similar
,
dp
,
dsu
,
graphs
,
shortest paths
,
sortings
2500
x1907
2056E
Nested Segments
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
2500
x1016
2056B
Find the Permutation
brute force
,
dfs and similar
,
graphs
,
implementation
,
sortings
1300
x17813
2053E
Resourceful Caterpillar Sequence
dfs and similar
,
dp
,
games
,
graphs
,
greedy
,
trees
1900
x4509
2050G
Tree Destruction
dfs and similar
,
dp
,
trees
1900
x5368
2045M
Mirror Maze
brute force
,
dfs and similar
,
graphs
,
implementation
1800
x2215
2044G2
Medium Demon Problem (hard version)
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1900
x3807
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binary search
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dfs and similar
divide and conquer
dp
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graphs
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