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Before contest
Codeforces Round 941 (Div. 1)
33:34:55
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Before contest
Codeforces Round 941 (Div. 2)
33:34:55
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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
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30945
115A
Party
dfs and similar
,
graphs
,
trees
900
x32725
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x5743
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x22052
1905B
Begginer's Zelda
greedy
,
trees
1100
x15160
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x16953
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15691
913B
Christmas Spruce
implementation
,
trees
1200
x15357
1583B
Omkar and Heavenly Tree
constructive algorithms
,
trees
1200
x11920
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17561
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x15885
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14399
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x14081
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x12518
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11396
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x10341
429A
Xor-tree
dfs and similar
,
trees
1300
x9970
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5425
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x14009
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13169
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12347
1143C
Queen
dfs and similar
,
trees
1400
x11144
981C
Useful Decomposition
implementation
,
trees
1400
x5115
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4264
120F
Spiders
dp
,
greedy
,
trees
1400
x3502
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x39596
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x15845
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x12857
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x11951
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x10760
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x10760
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9471
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x6739
821C
Okabe and Boxes
data structures
,
greedy
,
trees
1500
x6570
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5972
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5670
501C
Misha and Forest
constructive algorithms
,
data structures
,
greedy
,
sortings
,
trees
1500
x5506
901A
Hashing Trees
constructive algorithms
,
trees
1500
x5005
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3570
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1655
431C
k-Tree
dp
,
implementation
,
trees
1600
x24455
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19247
1363C
Game On Leaves
games
,
trees
1600
x17779
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x13802
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12281
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x11615
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x10445
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10080
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9407
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9394
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9371
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x8837
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x8782
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8574
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8352
1188A1
Add on a Tree
trees
1600
x8143
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x8026
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x6983
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x6898
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6583
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6389
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6070
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5614
339D
Xenia and Bit Operations
data structures
,
trees
1700
x23542
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13749
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10404
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10225
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9792
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8523
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x8037
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7582
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7135
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x7079
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6914
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6512
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5942
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5601
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5525
1085D
Minimum Diameter Tree
constructive algorithms
,
implementation
,
trees
1700
x5283
507C
Guess Your Way Out!
implementation
,
math
,
trees
1700
x4273
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x3825
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3377
290C
WTF?
*special problem
,
graph matchings
,
implementation
,
trees
1700
x1515
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13509
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9330
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9232
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x8983
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8844
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x8039
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7467
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7214
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6585
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6232
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6148
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x6012
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5754
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5707
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x5561
371D
Vessels
data structures
,
dsu
,
implementation
,
trees
1800
x5302
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5265
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