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Codeforces Round (Div. 3)
4 days
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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
981C
Useful Decomposition
implementation
,
trees
1400
x5242
980F
Cactus to Tree
dp
,
graphs
,
trees
2900
x194
980E
The Number Games
data structures
,
greedy
,
trees
2200
x1890
979D
Kuro and GCD and XOR and SUM
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
number theory
,
strings
,
trees
2200
x1721
979C
Kuro and Walking Route
dfs and similar
,
trees
1600
x6122
965E
Short Code
data structures
,
dp
,
greedy
,
strings
,
trees
2200
x1349
963B
Destruction of a Tree
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2000
x2723
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x126
962F
Simple Cycles Edges
dfs and similar
,
graphs
,
trees
2400
x1244
960H
Santa's Gift
data structures
,
trees
3100
x260
960E
Alternating Tree
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
probabilities
,
trees
2300
x1852
960D
Full Binary Tree Queries
brute force
,
implementation
,
trees
2100
x1866
959C
Mahmoud and Ehab and the wrong algorithm
constructive algorithms
,
trees
1500
x5721
958B2
Maximum Control (medium)
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
2200
x622
955F
Heaps
dp
,
trees
2600
x366
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x185
935E
Fafa and Ancient Mathematics
dfs and similar
,
dp
,
trees
2300
x869
932D
Tree
binary search
,
dp
,
trees
2200
x1672
930A
Peculiar apple-tree
dfs and similar
,
graphs
,
trees
1500
x6910
928D
Autocompletion
*special problem
,
strings
,
trees
1900
x804
925E
May Holidays
data structures
,
trees
2900
x376
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x74
923C
Perfect Security
data structures
,
greedy
,
strings
,
trees
1800
x4201
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x124
917D
Stranger Trees
dp
,
math
,
matrices
,
trees
2600
x1074
916E
Jamie and Tree
data structures
,
trees
2400
x1610
916D
Jamie and To-do List
data structures
,
interactive
,
trees
2200
x501
915F
Imbalance Value of a Tree
data structures
,
dsu
,
graphs
,
trees
2400
x2353
914H
Ember and Storm's Tree Game
combinatorics
,
dp
,
games
,
trees
3400
x235
914E
Palindromes in a Tree
bitmasks
,
data structures
,
divide and conquer
,
trees
2400
x1433
913B
Christmas Spruce
implementation
,
trees
1200
x15657
911F
Tree Destruction
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2400
x1583
901A
Hashing Trees
constructive algorithms
,
trees
1500
x5028
894D
Ralph And His Tour in Binary Country
brute force
,
data structures
,
trees
2200
x1113
893F
Subtree Minimum Query
data structures
,
trees
2300
x1754
891D
Sloth
dfs and similar
,
dp
,
graph matchings
,
trees
3100
x179
886C
Petya and Catacombs
dsu
,
greedy
,
implementation
,
trees
1300
x5443
877E
Danil and a Part-time Job
bitmasks
,
data structures
,
trees
2000
x4310
871E
Restore the Tree
graphs
,
greedy
,
trees
2900
x148
870E
Points, Lines and Ready-made Titles
dfs and similar
,
dsu
,
graphs
,
trees
2300
x1040
868E
Policeman and a Tree
dp
,
graphs
,
trees
2700
x469
864F
Cities Excursions
dfs and similar
,
graphs
,
trees
2700
x582
862B
Mahmoud and Ehab and the bipartiteness
dfs and similar
,
graphs
,
trees
1300
x16546
860E
Arkady and a Nobody-men
data structures
,
dfs and similar
,
trees
2700
x427
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1703
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x1039
856D
Masha and Cactus
dp
,
trees
2400
x378
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x482
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x205
855D
Rowena Ravenclaw's Diadem
trees
2500
x477
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x2020
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x561
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
x865
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x351
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x400
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3442
840E
In a Trap
trees
3200
x445
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x16235
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x710
835F
Roads in the Kingdom
dfs and similar
,
dp
,
graphs
,
trees
2500
x1022
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x387
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3659
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x273
830D
Singer House
combinatorics
,
dp
,
graphs
,
trees
2800
x812
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1077
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3448
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1162
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x289
821C
Okabe and Boxes
data structures
,
greedy
,
trees
1500
x6716
817F
MEX Queries
binary search
,
data structures
,
trees
2300
x2452
817E
Choosing The Commander
bitmasks
,
data structures
,
trees
2000
x2756
815C
Karen and Supermarket
brute force
,
dp
,
trees
2400
x2530
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2184
812E
Sagheer and Apple Tree
games
,
trees
2300
x1040
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x329
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x724
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1264
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x292
802K
Send the Fool Further! (medium)
dp
,
trees
2100
x608
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4386
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5440
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x2991
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x245
792D
Paths in a Complete Binary Tree
bitmasks
,
trees
1900
x2926
786E
ALT
data structures
,
flows
,
graphs
,
trees
3200
x610
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x139
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x8909
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x870
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x425
772E
Verifying Kingdom
binary search
,
divide and conquer
,
interactive
,
trees
3200
x125
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x2904
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x4021
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x2903
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x1255
763D
Timofey and a flat tree
data structures
,
graphs
,
hashing
,
shortest paths
,
trees
2900
x527
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10244
762F
Tree nesting
combinatorics
,
graphs
,
trees
2800
x357
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x1953
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x447
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