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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
42:42:23
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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
251E
Tree and Table
dfs and similar
,
dp
,
implementation
,
trees
3000
x168
1659F
Tree and Permutation Game
dfs and similar
,
games
,
graphs
,
trees
3000
x179
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x244
434E
Furukawa Nagisa's Tree
binary search
,
divide and conquer
,
sortings
,
trees
3000
x252
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x324
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x328
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x334
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x343
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x345
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x394
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x394
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x414
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x417
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x446
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x478
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x511
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x522
1442E
Black, White and Grey Tree
binary search
,
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
3000
x551
1707D
Partial Virtual Trees
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
3000
x579
1438F
Olha and Igor
interactive
,
probabilities
,
trees
3000
x609
1320E
Treeland and Viruses
data structures
,
dfs and similar
,
dp
,
shortest paths
,
trees
3000
x617
1361E
James and the Chase
dfs and similar
,
graphs
,
probabilities
,
trees
3000
x625
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1097G
Vladislav and a Great Legend
combinatorics
,
dp
,
trees
3000
x659
566C
Logistical Questions
dfs and similar
,
divide and conquer
,
trees
3000
x690
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x787
504E
Misha and LCP on Tree
binary search
,
dfs and similar
,
hashing
,
string suffix structures
,
trees
3000
x863
603E
Pastoral Oddities
data structures
,
divide and conquer
,
dsu
,
math
,
trees
3000
x1150
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x146
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x190
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x201
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x241
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x306
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x307
925E
May Holidays
data structures
,
trees
2900
x351
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x353
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x382
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x424
226E
Noble Knight's Path
data structures
,
trees
2900
x431
1055F
Tree and XOR
strings
,
trees
2900
x446
1276D
Tree Elimination
dp
,
trees
2900
x485
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x502
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x514
1667D
Edge Elimination
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x641
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x670
1553H
XOR and Distance
bitmasks
,
divide and conquer
,
trees
2900
x671
1580D
Subsequence
brute force
,
divide and conquer
,
dp
,
greedy
,
trees
2900
x757
1083C
Max Mex
data structures
,
trees
2900
x836
512D
Fox And Travelling
dp
,
trees
2900
x929
1479D
Odd Mineral Resource
binary search
,
bitmasks
,
brute force
,
data structures
,
probabilities
,
trees
2900
x957
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2437
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x125
1725I
Imitating the Key Tree
combinatorics
,
dsu
,
trees
2800
x183
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x290
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x303
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x306
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x345
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x369
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x371
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x380
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x384
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x388
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x396
1082F
Speed Dial
dp
,
strings
,
trees
2800
x405
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x406
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x413
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x421
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x426
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x461
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x466
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x467
1088F
Ehab and a weird weight formula
data structures
,
trees
2800
x488
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x513
1810F
M-tree
data structures
,
math
,
sortings
,
trees
2800
x533
51F
Caterpillar
dfs and similar
,
dp
,
graphs
,
trees
2800
x545
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x576
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x597
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x696
986E
Prince's Problem
brute force
,
data structures
,
math
,
number theory
,
trees
2800
x698
1413F
Roads and Ramen
data structures
,
trees
2800
x699
620F
Xors on Segments
data structures
,
strings
,
trees
2800
x700
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x798
1394D
Boboniu and Jianghu
dp
,
greedy
,
sortings
,
trees
2800
x804
983E
NN country
binary search
,
data structures
,
trees
2800
x866
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1222
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1520
1375G
Tree Modification
brute force
,
constructive algorithms
,
dfs and similar
,
graph matchings
,
graphs
,
trees
2800
x1638
1039D
You Are Given a Tree
data structures
,
dp
,
trees
2800
x1643
547E
Mike and Friends
data structures
,
string suffix structures
,
strings
,
trees
2800
x1931
555E
Case of Computer Network
dfs and similar
,
graphs
,
trees
2800
x2185
613D
Kingdom and its Cities
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
sortings
,
trees
2800
x2647
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x78
42E
Baldman and the military
dfs and similar
,
graphs
,
trees
2700
x187
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x254
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x325
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x326
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x388
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x419
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x446
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