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Before contest
Codeforces Round 983 (Div. 2)
15:13:02
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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
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2291
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12705
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3379
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1500
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3289
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8604
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1401
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x540
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x5989
1111E
Tree
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2500
x939
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x14835
1105D
Kilani and the Game
dfs and similar
,
graphs
,
implementation
,
shortest paths
1900
x4132
1103C
Johnny Solving
constructive algorithms
,
dfs and similar
,
graphs
,
math
2700
x850
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4689
1100E
Andrew and Taxi
binary search
,
dfs and similar
,
graphs
2200
x2379
1099F
Cookies
binary search
,
data structures
,
dfs and similar
,
dp
,
games
,
trees
2400
x952
1098C
Construct a tree
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1086
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8779
1093D
Beautiful Graph
dfs and similar
,
graphs
1700
x9213
1092F
Tree with Maximum Cost
dfs and similar
,
dp
,
trees
1900
x8178
1092E
Minimal Diameter Forest
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2000
x1743
1089H
Harder Satisfiability
2-sat
,
dfs and similar
,
graphs
3400
x112
1073F
Choosing Two Paths
dfs and similar
,
dp
,
greedy
,
trees
2500
x546
1067B
Multihedgehog
dfs and similar
,
graphs
,
shortest paths
1800
x2675
1065F
Up and Down the Tree
dfs and similar
,
dp
,
trees
2500
x1185
1065D
Three Pieces
dfs and similar
,
dp
,
shortest paths
2200
x1322
1062F
Upgrading Cities
dfs and similar
,
graphs
2900
x650
1062E
Company
binary search
,
data structures
,
dfs and similar
,
greedy
,
trees
2300
x1795
1062D
Fun with Integers
dfs and similar
,
graphs
,
implementation
,
math
1800
x3959
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x3159
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x6134
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x5917
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x704
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1575
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1311
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1363
1038E
Maximum Matching
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x987
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x14917
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x381
1033E
Hidden Bipartite Graph
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2800
x650
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x13720
1027F
Session in BSU
binary search
,
dfs and similar
,
dsu
,
graph matchings
,
graphs
2400
x1557
1027D
Mouse Hunt
dfs and similar
,
graphs
1700
x7503
1023F
Mobile Phone Network
dfs and similar
,
dsu
,
graphs
,
trees
2600
x885
1020B
Badge
brute force
,
dfs and similar
,
graphs
1000
x21282
1016F
Road Projects
dfs and similar
,
dp
,
trees
2600
x813
1012B
Chemical table
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
matrices
1900
x3977
1010D
Mars rover
dfs and similar
,
graphs
,
implementation
,
trees
2000
x2386
1006E
Military Problem
dfs and similar
,
graphs
,
trees
1600
x9930
1005F
Berland and the Shortest Paths
brute force
,
dfs and similar
,
graphs
,
shortest paths
2100
x1749
1000E
We Need More Bosses
dfs and similar
,
graphs
,
trees
2100
x4676
999E
Reachability from the Capital
dfs and similar
,
graphs
,
greedy
2000
x6683
990F
Flow Control
dfs and similar
,
dp
,
greedy
,
trees
2400
x905
986C
AND Graph
bitmasks
,
dfs and similar
,
dsu
,
graphs
2500
x2460
982F
The Meeting Place Cannot Be Changed
dfs and similar
,
graphs
2700
x193
982C
Cut 'em all!
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1500
x11622
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6293
977E
Cyclic Components
dfs and similar
,
dsu
,
graphs
1500
x20784
977D
Divide by three, multiply by two
dfs and similar
,
math
,
sortings
1400
x18419
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2815
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1340
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1944
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x674
954D
Fight Against Traffic
dfs and similar
,
graphs
,
shortest paths
1600
x6664
949C
Data Center Maintenance
dfs and similar
,
graphs
1900
x2058
948A
Protect Sheep
brute force
,
dfs and similar
,
graphs
,
implementation
900
x13830
939D
Love Rescue
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1600
x7347
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x188
936B
Sleepy Game
dfs and similar
,
dp
,
games
,
graphs
2100
x3268
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x894
932B
Recursive Queries
binary search
,
data structures
,
dfs and similar
1300
x8155
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x7196
920E
Connected Components?
data structures
,
dfs and similar
,
dsu
,
graphs
2100
x6418
920C
Swap Adjacent Elements
dfs and similar
,
greedy
,
math
,
sortings
,
two pointers
1400
x9224
919D
Substring
dfs and similar
,
dp
,
graphs
1700
x10095
917B
MADMAX
dfs and similar
,
dp
,
games
,
graphs
1700
x3538
915D
Almost Acyclic Graph
dfs and similar
,
graphs
2200
x3451
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1596
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1737
910A
The Way to Home
dfs and similar
,
dp
,
greedy
,
implementation
800
x11947
909E
Coprocessor
dfs and similar
,
dp
,
graphs
,
greedy
1900
x2102
902B
Coloring a Tree
dfs and similar
,
dsu
,
greedy
1200
x10840
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x505
901C
Bipartite Segments
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2300
x1184
896A
Nephren gives a riddle
binary search
,
dfs and similar
1700
x3467
893C
Rumor
dfs and similar
,
graphs
,
greedy
1300
x23361
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x194
884C
Bertown Subway
dfs and similar
,
greedy
,
math
1500
x4738
883G
Orientation of Edges
dfs and similar
,
graphs
1900
x1420
877D
Olya and Energy Drinks
data structures
,
dfs and similar
,
graphs
,
shortest paths
2100
x4365
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x2132
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1236
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x250
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x620
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x18068
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x438
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1866
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1612
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x221
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x580
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