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Codeforces Round 937 (Div. 4)
00:34:50
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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
580C
Kefa and Park
dfs and similar
,
graphs
,
trees
1500
x39140
115A
Party
dfs and similar
,
graphs
,
trees
900
x32372
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30449
431C
k-Tree
dp
,
implementation
,
trees
1600
x24207
339D
Xenia and Bit Operations
data structures
,
trees
1700
x23303
1511C
Yet Another Card Deck
brute force
,
data structures
,
implementation
,
trees
1100
x21774
1336A
Linova and Kingdom
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
1600
x19037
1363C
Game On Leaves
games
,
trees
1600
x17672
1857D
Strong Vertices
math
,
sortings
,
trees
1300
x17265
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x16673
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x15681
522A
Reposts
*special problem
,
dfs and similar
,
dp
,
graphs
,
trees
1200
x15563
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x15487
913B
Christmas Spruce
implementation
,
trees
1200
x15271
1905B
Begginer's Zelda
greedy
,
trees
1100
x14881
1741D
Masha and a Beautiful Tree
dfs and similar
,
divide and conquer
,
graphs
,
sortings
,
trees
1300
x14188
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x13894
1676G
White-Black Balanced Subtrees
dfs and similar
,
dp
,
graphs
,
trees
1300
x13715
1528A
Parsa's Humongous Tree
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
trees
1600
x13641
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13587
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x13292
1559D1
Mocha and Diana (Easy Version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
trees
1400
x13092
1325C
Ehab and Path-etic MEXs
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1500
x12761
1675D
Vertical Paths
graphs
,
implementation
,
trees
1300
x12416
600E
Lomsat gelral
data structures
,
dfs and similar
,
dsu
,
trees
2300
x12352
1437D
Minimal Height Tree
graphs
,
greedy
,
shortest paths
,
trees
1600
x12222
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12133
1583B
Omkar and Heavenly Tree
constructive algorithms
,
trees
1200
x11870
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x11722
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x11474
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11293
1143C
Queen
dfs and similar
,
trees
1400
x10988
1466D
13th Labour of Heracles
data structures
,
greedy
,
sortings
,
trees
1500
x10676
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x10628
1689C
Infected Tree
dfs and similar
,
dp
,
trees
1600
x10316
1176E
Cover it!
dfs and similar
,
dsu
,
graphs
,
shortest paths
,
trees
1700
x10263
1383A
String Transformation 1
dsu
,
graphs
,
greedy
,
sortings
,
strings
,
trees
,
two pointers
1700
x10184
1663A
Who Tested?
*special problem
,
expression parsing
,
trees
x10162
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10102
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10021
1900C
Anji's Binary Tree
dfs and similar
,
dp
,
trees
1300
x9975
429A
Xor-tree
dfs and similar
,
trees
1300
x9845
61E
Enemy is weak
data structures
,
trees
1900
x9834
1406C
Link Cut Centroids
constructive algorithms
,
dfs and similar
,
graphs
,
trees
1700
x9736
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9405
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9334
369C
Valera and Elections
dfs and similar
,
graphs
,
trees
1600
x9310
1388C
Uncle Bogdan and Country Happiness
dfs and similar
,
greedy
,
math
,
trees
1800
x9293
1861C
Queries for the Array
data structures
,
dfs and similar
,
implementation
,
strings
,
trees
1600
x9252
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9142
1324F
Maximum White Subtree
dfs and similar
,
dp
,
graphs
,
trees
1800
x8859
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8791
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x8790
1328E
Tree Queries
dfs and similar
,
graphs
,
trees
1900
x8670
1523C
Compression and Expansion
brute force
,
data structures
,
greedy
,
implementation
,
trees
1600
x8549
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x8408
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8318
1369D
TediousLee
dp
,
graphs
,
greedy
,
math
,
trees
1900
x8216
1188A1
Add on a Tree
trees
1600
x8115
1338B
Edge Weight Assignment
bitmasks
,
constructive algorithms
,
dfs and similar
,
greedy
,
math
,
trees
1800
x7987
1693B
Fake Plastic Trees
dfs and similar
,
dp
,
greedy
,
trees
1700
x7972
1665C
Tree Infection
binary search
,
greedy
,
sortings
,
trees
1600
x7963
1592C
Bakry and Partitioning
bitmasks
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x7475
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7467
1535D
Playoff Tournament
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1800
x7430
1187E
Tree Painting
dfs and similar
,
dp
,
trees
2100
x7259
1285D
Dr. Evil Underscores
bitmasks
,
brute force
,
dfs and similar
,
divide and conquer
,
dp
,
greedy
,
strings
,
trees
1900
x7225
1244D
Paint the Tree
brute force
,
constructive algorithms
,
dp
,
graphs
,
implementation
,
trees
1800
x7168
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x7139
1404B
Tree Tag
dfs and similar
,
dp
,
games
,
trees
1900
x7027
1714G
Path Prefixes
binary search
,
data structures
,
dfs and similar
,
trees
1700
x6993
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x6955
1092F
Tree with Maximum Cost
dfs and similar
,
dp
,
trees
1900
x6905
1609D
Social Network
dsu
,
graphs
,
greedy
,
implementation
,
trees
1600
x6844
609E
Minimum spanning tree for each edge
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x6808
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x6804
1245D
Shichikuji and Power Grid
dsu
,
graphs
,
greedy
,
shortest paths
,
trees
1900
x6778
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x6689
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x6633
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x6627
821C
Okabe and Boxes
data structures
,
greedy
,
trees
1500
x6550
1213G
Path Queries
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
1800
x6526
570D
Tree Requests
binary search
,
bitmasks
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2200
x6522
1363E
Tree Shuffling
dfs and similar
,
dp
,
greedy
,
trees
2000
x6441
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6412
639B
Bear and Forgotten Tree 3
constructive algorithms
,
graphs
,
trees
1600
x6367
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6351
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6180
519E
A and B and Lecture Rooms
binary search
,
data structures
,
dfs and similar
,
dp
,
trees
2100
x6118
482B
Interesting Array
constructive algorithms
,
data structures
,
trees
1800
x6113
1388D
Captain Flint and Treasure
data structures
,
dfs and similar
,
graphs
,
greedy
,
implementation
,
trees
2000
x6082
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6065
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6028
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6016
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5961
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x5945
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x5905
1436D
Bandit in a City
binary search
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x5800
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x5733
1534D
Lost Tree
constructive algorithms
,
interactive
,
trees
1800
x5710
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