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Codeforces Round 937 (Div. 4)
05:59:24
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Difficulty:
—
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
916E
Jamie and Tree
data structures
,
trees
2400
x1496
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x481
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2279
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x225
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1352
913B
Christmas Spruce
implementation
,
trees
1200
x15269
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1490
901A
Hashing Trees
constructive algorithms
,
trees
1500
x4991
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1095
893F
Subtree Minimum Query
data structures
,
trees
2300
x1622
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x164
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5419
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4185
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x144
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x970
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x439
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x571
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x15485
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x416
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1625
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x846
856D
Masha and Cactus
dp
,
trees
2400
x360
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x474
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x197
855D
Rowena Ravenclaw's Diadem
trees
2500
x472
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x1959
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x547
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x313
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x846
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x343
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x392
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3386
840E
In a Trap
trees
3200
x429
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x15678
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x684
835F
Roads in the Kingdom
dfs and similar
,
dp
,
graphs
,
trees
2500
x980
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x361
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3519
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x265
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x789
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1045
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3429
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1124
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x285
821C
Okabe and Boxes
data structures
,
greedy
,
trees
1500
x6550
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2369
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2656
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2426
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2118
812E
Sagheer and Apple Tree
games
,
trees
2300
x1011
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x324
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x706
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1248
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x275
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x574
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x3968
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5032
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x2956
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x237
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2874
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x592
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x124
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x8789
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x844
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x406
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x121
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x2768
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x3922
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2768
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x1242
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x506
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10021
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x344
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x1886
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x437
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x469
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x11292
754E
Dasha and cyclic table
bitmasks
,
brute force
,
fft
,
strings
,
trees
2600
x476
750F
New Year and Finding Roots
constructive algorithms
,
implementation
,
interactive
,
trees
2800
x460
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x629
746G
New Roads
constructive algorithms
,
graphs
,
trees
2100
x1298
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4229
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2387
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4373
735E
Ostap and Tree
dp
,
trees
2500
x837
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x3702
733F
Drivers Dissatisfaction
data structures
,
dsu
,
graphs
,
trees
2200
x1082
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x985
724F
Uniformly Branched Trees
combinatorics
,
dp
,
trees
2700
x385
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3059
718D
Andrew and Chemistry
dp
,
hashing
,
trees
2900
x380
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x1859
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x2943
706D
Vasiliy's Multiset
binary search
,
bitmasks
,
data structures
,
trees
1800
x9140
704E
Iron Man
data structures
,
geometry
,
trees
3300
x265
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x3737
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5579
696E
...Wait for it...
data structures
,
dsu
,
trees
3000
x454
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3369
696A
Lorenzo Von Matterhorn
brute force
,
data structures
,
implementation
,
trees
1500
x5961
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