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Codeforces Round 950 (Div. 3)
3 days
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Difficulty:
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dfs and similar
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
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1313
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x957
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x13961
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x362
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x586
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x13026
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1510
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x7088
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x865
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x20286
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x783
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3663
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2356
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9475
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1623
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x3995
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6390
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x873
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2197
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x186
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x10896
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6102
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x19417
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x17702
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2705
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1237
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1830
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x617
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6327
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x1987
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13425
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7156
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x183
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3036
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x868
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x7816
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x6840
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x5906
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9017
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x9428
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3494
915D
Almost Acyclic Graph
dfs and similar
,
graphs
2200
x3295
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1494
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1570
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x11430
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x1997
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10502
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x430
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1134
896A
Nephren gives a riddle
binary search
,
dfs and similar
1700
x3342
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x21856
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x170
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4625
883G
Orientation of Edges
dfs and similar
,
graphs
1900
x1387
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x3966
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x1924
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x980
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x237
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x581
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x16162
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x425
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1649
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1485
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x200
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x558
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x316
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1505
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x856
845G
Shortest Path Problem?
dfs and similar
,
graphs
,
math
2300
x1508
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x347
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5563
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x398
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3422
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2279
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x16005
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x704
835F
Roads in the Kingdom
dfs and similar
,
dp
,
graphs
,
trees
2500
x1011
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3630
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1072
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1149
825E
Minimal Labels
data structures
,
dfs and similar
,
graphs
,
greedy
2300
x3007
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x289
821D
Okabe and City
dfs and similar
,
graphs
,
shortest paths
2200
x1351
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2126
813C
The Tag Game
dfs and similar
,
graphs
1700
x5712
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x327
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1567
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x138
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1259
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1613
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x286
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4316
797D
Broken BST
data structures
,
dfs and similar
2100
x1758
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5203
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x765
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x244
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4348
788C
The Great Mixing
dfs and similar
,
graphs
,
shortest paths
2300
x2015
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2299
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x138
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