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Codeforces Round 949 (Div. 2)
01:22:18
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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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Custom test
Problems
#
Name
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x317
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x323
1396E
Distance Matching
constructive algorithms
,
dfs and similar
,
trees
3200
x323
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x323
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x327
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x329
1252D
Find String in a Grid
data structures
,
dp
,
strings
,
trees
3000
x329
1019E
Raining season
data structures
,
divide and conquer
,
trees
3200
x329
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x329
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x335
1168D
Anagram Paths
dp
,
implementation
,
trees
3000
x337
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x346
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x347
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x355
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x355
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x358
1654G
Snowy Mountain
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
2900
x358
1403B
Spring cleaning
*special problem
,
data structures
,
dfs and similar
,
graphs
,
trees
2300
x358
955F
Heaps
dp
,
trees
2600
x359
1725J
Journey
dp
,
trees
2500
x362
925E
May Holidays
data structures
,
trees
2900
x362
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x365
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x367
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x371
856D
Masha and Cactus
dp
,
trees
2400
x372
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x373
536E
Tavas on the Path
data structures
,
divide and conquer
,
trees
3100
x374
533A
Berland Miners
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
3000
x375
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x376
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x377
1214H
Tiles Placement
constructive algorithms
,
dfs and similar
,
trees
2800
x378
1389G
Directing Edges
dfs and similar
,
dp
,
graphs
,
trees
2800
x382
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x386
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x386
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x387
1379E
Inverse Genealogy
constructive algorithms
,
divide and conquer
,
dp
,
math
,
trees
2800
x391
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x392
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x395
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x398
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x400
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x403
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x404
1710D
Recover the Tree
constructive algorithms
,
trees
3400
x410
1082F
Speed Dial
dp
,
strings
,
trees
2800
x411
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x414
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x414
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x415
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x416
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x420
1228F
One Node is Gone
constructive algorithms
,
implementation
,
trees
2500
x420
1193B
Magic Tree
*special problem
,
data structures
,
dp
,
trees
x420
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x421
1299D
Around the World
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
graphs
,
graphs
,
math
,
trees
3000
x421
1067E
Random Forest Rank
dp
,
graph matchings
,
math
,
trees
2800
x425
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x425
997D
Cycles in product
combinatorics
,
divide and conquer
,
trees
2900
x426
348E
Pilgrims
dfs and similar
,
dp
,
trees
2800
x427
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x432
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x435
1725E
Electrical Efficiency
combinatorics
,
data structures
,
dp
,
math
,
number theory
,
trees
2500
x437
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x439
840E
In a Trap
trees
3200
x440
226E
Noble Knight's Path
data structures
,
trees
2900
x444
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x445
1662G
Gastronomic Event
dp
,
greedy
,
trees
x448
1517F
Reunion
combinatorics
,
dp
,
trees
3200
x448
1055F
Tree and XOR
strings
,
trees
2900
x448
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x451
1452G
Game On Tree
data structures
,
dfs and similar
,
greedy
,
trees
2700
x459
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x462
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x463
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x466
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x466
418D
Big Problems for Organizers
data structures
,
graphs
,
trees
2800
x469
855D
Rowena Ravenclaw's Diadem
trees
2500
x476
1481F
AB Tree
dp
,
greedy
,
trees
3100
x477
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x477
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x478
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x479
70E
Information Reform
dp
,
implementation
,
trees
2700
x481
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x482
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x482
1260F
Colored Tree
data structures
,
trees
2700
x486
1276D
Tree Elimination
dp
,
trees
2900
x489
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x490
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x491
1088F
Ehab and a weird weight formula
data structures
,
trees
2800
x492
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x492
1184E3
Daleks' Invasion (hard)
data structures
,
dsu
,
graphs
,
trees
2400
x495
1252B
Cleaning Robots
dp
,
trees
2300
x503
1528E
Mashtali and Hagh Trees
combinatorics
,
dp
,
trees
2900
x513
494D
Birthday
data structures
,
dfs and similar
,
dp
,
trees
2700
x515
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x516
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x517
1606F
Tree Queries
brute force
,
dp
,
trees
2800
x521
482D
Random Function and Tree
combinatorics
,
dp
,
trees
2700
x521
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x522
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x523
1854D
Michael and Hotel
binary search
,
interactive
,
trees
3000
x527
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x530
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