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Before contest
Codeforces Round 941 (Div. 1)
14:09:48
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Before contest
Codeforces Round 941 (Div. 2)
14:09:48
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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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Name
1691F
K-Set Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2500
x904
1661E
Narrow Components
brute force
,
data structures
,
dp
,
dsu
,
math
,
trees
2500
x910
1280D
Miss Punyverse
dp
,
greedy
,
trees
2500
x918
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x958
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x973
1332F
Independent Set
dfs and similar
,
dp
,
trees
2500
x975
835F
Roads in the Kingdom
dfs and similar
,
dp
,
graphs
,
trees
2500
x991
1188A2
Add on a Tree: Revolution
constructive algorithms
,
dfs and similar
,
implementation
,
trees
2500
x1069
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1074
1146F
Leaf Partition
dp
,
trees
2500
x1085
1065F
Up and Down the Tree
dfs and similar
,
dp
,
trees
2500
x1131
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1140
1485E
Move and Swap
dfs and similar
,
dp
,
greedy
,
trees
2500
x1213
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1214
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1237
1824C
LuoTianyi and XOR-Tree
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
trees
2500
x1240
1858E1
Rollbacks (Easy Version)
brute force
,
data structures
,
dfs and similar
,
trees
2500
x1241
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1256
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1258
1467E
Distinctive Roots in a Tree
data structures
,
dfs and similar
,
dp
,
trees
2500
x1330
1508C
Complete the MST
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
2500
x1417
1253F
Cheap Robot
binary search
,
dsu
,
graphs
,
shortest paths
,
trees
2500
x1574
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1690
1521D
Nastia Plays with a Tree
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
2500
x1802
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2523
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x279
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x314
856D
Masha and Cactus
dp
,
trees
2400
x367
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x492
288D
Polo the Penguin and Trees
combinatorics
,
dfs and similar
,
trees
2400
x671
1182D
Complete Mirror
constructive algorithms
,
dfs and similar
,
dp
,
hashing
,
implementation
,
trees
2400
x800
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x814
1263F
Economic Difficulties
data structures
,
dfs and similar
,
dp
,
flows
,
graphs
,
trees
2400
x833
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x840
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x844
1098C
Construct a tree
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x865
1252F
Regular Forestation
hashing
,
trees
2400
x868
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x869
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x886
1032F
Vasya and Maximum Matching
dp
,
trees
2400
x894
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x907
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x951
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1003
1004E
Sonya and Ice Cream
binary search
,
data structures
,
dp
,
greedy
,
shortest paths
,
trees
2400
x1007
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1011
632F
Magic Matrix
brute force
,
divide and conquer
,
graphs
,
matrices
,
trees
2400
x1019
258E
Little Elephant and Tree
data structures
,
dfs and similar
,
trees
2400
x1026
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1042
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1063
601D
Acyclic Organic Compounds
data structures
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2400
x1088
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1107
1738F
Connectivity Addicts
constructive algorithms
,
dsu
,
graphs
,
greedy
,
interactive
,
shortest paths
,
trees
2400
x1146
593D
Happy Tree Party
data structures
,
dfs and similar
,
graphs
,
math
,
trees
2400
x1178
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1179
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1207
277E
Binary Tree on Plane
flows
,
trees
2400
x1232
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1237
1499F
Diameter Cuts
combinatorics
,
dfs and similar
,
dp
,
trees
2400
x1243
1109D
Sasha and Interesting Fact from Graph Theory
brute force
,
combinatorics
,
dp
,
math
,
trees
2400
x1264
1770E
Koxia and Tree
combinatorics
,
dfs and similar
,
dp
,
dsu
,
math
,
probabilities
,
trees
2400
x1291
1059E
Split the Tree
binary search
,
data structures
,
dp
,
greedy
,
trees
2400
x1351
1370F1
The Hidden Pair (Easy Version)
binary search
,
dfs and similar
,
graphs
,
interactive
,
shortest paths
,
trees
2400
x1356
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1376
653E
Bear and Forgotten Tree 2
dfs and similar
,
dsu
,
graphs
,
trees
2400
x1376
1707C
DFS Trees
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1381
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1385
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1394
1088E
Ehab and a component choosing problem
dp
,
greedy
,
math
,
trees
2400
x1395
1174F
Ehab and the Big Finale
constructive algorithms
,
divide and conquer
,
graphs
,
implementation
,
interactive
,
trees
2400
x1434
1463E
Plan of Lectures
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2400
x1436
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1455
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1513
916E
Jamie and Tree
data structures
,
trees
2400
x1551
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1554
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1720
990G
GCD Counting
divide and conquer
,
dp
,
dsu
,
number theory
,
trees
2400
x1720
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1725
1527D
MEX Tree
combinatorics
,
dfs and similar
,
implementation
,
math
,
trees
2400
x1822
1408E
Avoid Rainbow Cycles
data structures
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1874
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2041
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2110
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2299
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2426
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2461
1051F
The Shortest Statement
graphs
,
shortest paths
,
trees
2400
x2653
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6171
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x7593
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
1252B
Cleaning Robots
dp
,
trees
2300
x501
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x554
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x620
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x633
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x671
414D
Mashmokh and Water Tanks
binary search
,
data structures
,
greedy
,
trees
,
two pointers
2300
x673
1575I
Illusions of the Desert
data structures
,
trees
2300
x837
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x845
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x850
509F
Progress Monitoring
dp
,
trees
2300
x861
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x865
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