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Codeforces Round 973 (Div. 2)
10:07:37
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Difficulty:
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graphs
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
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x276
1029E
Tree with Small Distances
dp
,
graphs
,
greedy
2100
x2914
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1543
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x7419
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x880
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x20980
1019C
Sergey's problem
constructive algorithms
,
graphs
3000
x1108
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3932
1010F
Tree
fft
,
graphs
,
trees
3400
x218
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2375
1009G
Allowed Letters
bitmasks
,
flows
,
graph matchings
,
graphs
,
greedy
2400
x820
1009D
Relatively Prime Graph
brute force
,
constructive algorithms
,
graphs
,
greedy
,
math
1700
x6231
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9809
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1681
1003E
Tree Constructing
constructive algorithms
,
graphs
2100
x2700
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x4589
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6609
995E
Number Clicker
divide and conquer
,
graphs
,
meet-in-the-middle
,
number theory
2700
x659
990D
Graph And Its Complement
constructive algorithms
,
graphs
,
implementation
1700
x3795
989C
A Mist of Florescence
constructive algorithms
,
graphs
1800
x3790
986F
Oppa Funcan Style Remastered
graphs
,
math
,
number theory
,
shortest paths
3300
x609
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2439
986A
Fair
graphs
,
greedy
,
number theory
,
shortest paths
1600
x6856
983C
Elevator
dp
,
graphs
,
shortest paths
2400
x826
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x190
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x11433
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x196
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x20459
976F
Minimal k-covering
flows
,
graphs
2500
x577
976D
Degree Set
constructive algorithms
,
graphs
,
implementation
2500
x679
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1326
960F
Pathwalks
data structures
,
dp
,
graphs
2100
x2956
959E
Mahmoud and Ehab and the xor-MST
bitmasks
,
dp
,
graphs
,
implementation
,
math
1900
x3389
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x637
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6578
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x2041
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13690
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7291
939A
Love Triangle
graphs
800
x25051
938G
Shortest Path Queries
bitmasks
,
data structures
,
dsu
,
graphs
2900
x901
938D
Buy a Ticket
data structures
,
graphs
,
shortest paths
2000
x5617
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3250
933C
A Colourful Prospect
geometry
,
graphs
2700
x573
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x7084
928C
Dependency management
*special problem
,
graphs
,
implementation
1900
x885
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x75
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x6283
919F
A Game With Numbers
games
,
graphs
,
shortest paths
2600
x335
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x9862
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3525
916C
Jamie and Interesting Graph
constructive algorithms
,
graphs
,
shortest paths
1600
x5085
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2450
915D
Almost Acyclic Graph
dfs and similar
,
graphs
2200
x3414
913F
Strongly Connected Tournament
dp
,
graphs
,
math
,
probabilities
2800
x651
912D
Fishes
data structures
,
graphs
,
greedy
,
probabilities
,
shortest paths
2100
x2005
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1676
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x2063
908F
New Year and Rainbow Roads
graphs
,
greedy
,
implementation
2400
x1389
906C
Party
bitmasks
,
brute force
,
dp
,
graphs
2400
x1332
903G
Yet Another Maxflow Problem
data structures
,
flows
,
graphs
2700
x529
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x497
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1168
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8438
894E
Ralph and Mushrooms
dp
,
graphs
2100
x2305
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x22877
891C
Envy
data structures
,
dsu
,
graphs
2300
x2358
888F
Connecting Vertices
dp
,
graphs
2500
x800
886D
Restoration of string
constructive algorithms
,
graphs
,
implementation
2000
x1776
884F
Anti-Palindromize
flows
,
graphs
,
greedy
2500
x1056
883G
Orientation of Edges
dfs and similar
,
graphs
1900
x1409
883B
Berland Army
constructive algorithms
,
graphs
,
greedy
2600
x343
878C
Tournament
data structures
,
graphs
2700
x920
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x4314
875F
Royal Questions
dsu
,
graphs
,
greedy
2500
x1328
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x2115
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x148
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1225
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x250
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x489
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x124
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x616
863C
1-2-3
graphs
,
implementation
1800
x2488
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x17353
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1848
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1565
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x207
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x573
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x386
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x382
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x320
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x628
845G
Shortest Path Problem?
dfs and similar
,
graphs
,
math
2300
x1604
843E
Maximum Flow
flows
,
graphs
3000
x318
843D
Dynamic Shortest Path
graphs
,
shortest paths
3400
x834
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x360
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x417
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3475
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2465
839E
Mother of Dragons
brute force
,
graphs
,
math
,
meet-in-the-middle
2700
x905
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x16692
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