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Codeforces Round 950 (Div. 3)
32:00:37
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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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Problems
#
Name
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x126
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1238
960H
Santa's Gift
data structures
,
trees
3100
x257
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1830
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1736
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5698
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x617
955F
Heaps
dp
,
trees
2600
x359
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x183
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x868
932D
Tree
binary search
,
dp
,
trees
2200
x1648
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x6842
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x803
925E
May Holidays
data structures
,
trees
2900
x363
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x73
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4167
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x123
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x1038
916E
Jamie and Tree
data structures
,
trees
2400
x1594
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x492
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2320
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x233
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1403
913B
Christmas Spruce
implementation
,
trees
1200
x15500
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1570
901A
Hashing Trees
constructive algorithms
,
trees
1500
x5017
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1108
893F
Subtree Minimum Query
data structures
,
trees
2300
x1686
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x170
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5438
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4273
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x148
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x987
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x466
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x581
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x16171
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
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x911
856D
Masha and Cactus
dp
,
trees
2400
x372
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x479
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x200
855D
Rowena Ravenclaw's Diadem
trees
2500
x476
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x1994
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
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x857
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x347
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
x3423
840E
In a Trap
trees
3200
x443
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x16016
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x704
835F
Roads in the Kingdom
dfs and similar
,
dp
,
graphs
,
trees
2500
x1011
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x376
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3630
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x273
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x810
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1072
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3442
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1149
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x289
821C
Okabe and Boxes
data structures
,
greedy
,
trees
1500
x6650
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2426
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2713
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2484
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2126
812E
Sagheer and Apple Tree
games
,
trees
2300
x1020
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x327
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x723
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1259
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x286
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x595
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4321
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5224
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x2983
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x245
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2910
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x607
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x138
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x8870
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x867
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x416
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x123
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x2813
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x4006
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2859
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x1248
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x516
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10168
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x346
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x1910
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x445
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x483
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11755
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x482
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x478
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x634
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1356
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4256
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