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Educational Codeforces Round 165 (Rated for Div. 2)
29:55:57
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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
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x479
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x478
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x478
70E
Information Reform
dp
,
implementation
,
trees
2700
x476
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x475
855D
Rowena Ravenclaw's Diadem
trees
2500
x474
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x467
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x466
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x461
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x459
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x457
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x456
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x452
1481F
AB Tree
dp
,
greedy
,
trees
3100
x451
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x446
1055F
Tree and XOR
strings
,
trees
2900
x446
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x446
1662G
Gastronomic Event
dp
,
greedy
,
trees
x443
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x439
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x435
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x432
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x432
840E
In a Trap
trees
3200
x432
226E
Noble Knight's Path
data structures
,
trees
2900
x431
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x426
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x424
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x422
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x421
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x419
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x417
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x417
1193B
Magic Tree
*special problem
,
data structures
,
dp
,
trees
x416
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x414
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x414
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x406
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x405
1082F
Speed Dial
dp
,
strings
,
trees
2800
x405
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x404
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x396
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x396
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x395
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
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x394
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x388
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x388
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x384
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x384
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x382
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x380
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x371
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x371
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x370
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x370
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x369
856D
Masha and Cactus
dp
,
trees
2400
x367
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x365
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x363
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x357
1725J
Journey
dp
,
trees
2500
x356
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x353
925E
May Holidays
data structures
,
trees
2900
x351
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x346
955F
Heaps
dp
,
trees
2600
x345
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x345
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x345
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x343
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x334
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x328
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x326
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x326
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x326
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x325
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x324
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x319
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x318
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x314
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x313
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x307
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x306
1361D
Johnny and James
greedy
,
implementation
,
math
,
trees
2900
x306
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x306
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x305
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x304
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x303
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x302
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x302
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x290
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x288
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x287
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x280
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x279
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x279
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
x274
1464F
My Beautiful Madness
data structures
,
trees
3500
x273
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x272
704E
Iron Man
data structures
,
geometry
,
trees
3300
x272
1344E
Train Tracks
data structures
,
trees
3100
x267
1254E
Send Tree to Charlie
combinatorics
,
dfs and similar
,
dsu
,
trees
3300
x259
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