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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
22:47:59
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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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Custom test
Problems
#
Name
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1868
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1635
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x222
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x581
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x321
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1534
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x903
845G
Shortest Path Problem?
dfs and similar
,
graphs
,
math
2300
x1691
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x361
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5682
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x433
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3504
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2484
839C
Journey
dfs and similar
,
dp
,
graphs
,
probabilities
,
trees
1500
x17045
838B
Diverging Directions
data structures
,
dfs and similar
,
trees
2100
x835
835F
Roads in the Kingdom
dfs and similar
,
dp
,
graphs
,
trees
2500
x1078
832D
Misha, Grisha and Underground
dfs and similar
,
graphs
,
trees
1900
x3815
827D
Best Edge Weight
data structures
,
dfs and similar
,
graphs
,
trees
2700
x1178
825G
Tree Queries
dfs and similar
,
graphs
,
trees
2500
x1239
825E
Minimal Labels
data structures
,
dfs and similar
,
graphs
,
greedy
2300
x3492
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x349
821D
Okabe and City
dfs and similar
,
graphs
,
shortest paths
2200
x1433
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2369
813C
The Tag Game
dfs and similar
,
graphs
1700
x6066
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x330
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1773
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x164
804D
Expected diameter of a tree
binary search
,
brute force
,
dfs and similar
,
dp
,
sortings
,
trees
2500
x1334
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1845
802L
Send the Fool Further! (hard)
dfs and similar
,
dp
,
math
,
trees
2400
x314
802J
Send the Fool Further! (easy)
dfs and similar
,
graphs
,
trees
1400
x4767
797D
Broken BST
data structures
,
dfs and similar
2100
x1839
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5789
794D
Labelling Cities
dfs and similar
,
graphs
,
hashing
2400
x822
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x254
793B
Igor and his way to work
dfs and similar
,
graphs
,
implementation
,
shortest paths
1600
x4465
788C
The Great Mixing
dfs and similar
,
graphs
,
shortest paths
2300
x2298
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2598
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x142
786A
Berzerk
dfs and similar
,
dp
,
games
2000
x2562
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2100
x2599
780C
Andryusha and Colored Balloons
dfs and similar
,
graphs
,
greedy
,
trees
1600
x9159
778C
Peterson Polyglot
brute force
,
dfs and similar
,
dsu
,
hashing
,
strings
,
trees
2500
x924
778B
Bitwise Formula
bitmasks
,
brute force
,
dfs and similar
,
expression parsing
,
implementation
1800
x2328
776D
The Door Problem
2-sat
,
dfs and similar
,
dsu
,
graphs
2000
x5133
771C
Bear and Tree Jumps
dfs and similar
,
dp
,
trees
2100
x3153
771A
Bear and Friendship Condition
dfs and similar
,
dsu
,
graphs
1500
x15481
770C
Online Courses In BSU
*special problem
,
dfs and similar
,
graphs
,
implementation
1500
x2659
769C
Cycle In Maze
*special problem
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1700
x2306
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x6001
767C
Garland
dfs and similar
,
graphs
,
greedy
,
trees
2000
x4196
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x3038
766D
Mahmoud and a Dictionary
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
2000
x3429
765E
Tree Folding
dfs and similar
,
dp
,
greedy
,
implementation
,
trees
2200
x1286
763A
Timofey and a tree
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
1600
x10636
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2183
758E
Broken Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2600
x497
756A
Pavel and barbecue
constructive algorithms
,
dfs and similar
1700
x3072
755C
PolandBall and Forest
dfs and similar
,
dsu
,
graphs
,
interactive
,
trees
1300
x12572
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x194
750D
New Year and Fireworks
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
1900
x3084
748F
Santa Clauses and a Soccer Championship
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2300
x661
747E
Comments
dfs and similar
,
expression parsing
,
implementation
,
strings
1700
x1974
744A
Hongcow Builds A Nation
dfs and similar
,
graphs
1500
x8458
743D
Chloe and pleasant prizes
dfs and similar
,
dp
,
graphs
,
trees
1800
x4379
741D
Arpa’s letter-marked tree and Mehrdad’s Dokhtar-kosh paths
data structures
,
dfs and similar
,
trees
2900
x2814
741C
Arpa’s overnight party and Mehrdad’s silent entering
constructive algorithms
,
dfs and similar
,
graphs
2600
x2641
741B
Arpa's weak amphitheater and Mehrdad's valuable Hoses
dfs and similar
,
dp
,
dsu
1600
x5290
741A
Arpa's loud Owf and Mehrdad's evil plan
dfs and similar
,
math
1600
x5441
739B
Alyona and a tree
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
1900
x4670
734E
Anton and Tree
dfs and similar
,
dp
,
trees
2100
x4240
732F
Tourist Reform
dfs and similar
,
graphs
2300
x2613
731C
Socks
dfs and similar
,
dsu
,
graphs
,
greedy
1600
x7039
730C
Bulmart
binary search
,
dfs and similar
2100
x1250
727A
Transformation: from A to B
brute force
,
dfs and similar
,
math
1000
x14061
723E
One-Way Reform
constructive algorithms
,
dfs and similar
,
flows
,
graphs
,
greedy
2200
x2000
723D
Lakes in Berland
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1600
x6975
722D
Generating Sets
binary search
,
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
1900
x3191
720B
Cactusophobia
dfs and similar
,
flows
2400
x407
717E
Paint it really, really dark gray
dfs and similar
1900
x1451
715C
Digit Tree
dfs and similar
,
divide and conquer
,
dsu
,
trees
2700
x2155
711D
Directed Roads
combinatorics
,
dfs and similar
,
graphs
,
math
1900
x4500
710E
Generate a String
dfs and similar
,
dp
2000
x5237
708C
Centroids
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
2300
x3381
707D
Persistent Bookcase
bitmasks
,
data structures
,
dfs and similar
,
implementation
2200
x2713
700C
Break Up
dfs and similar
,
graphs
2600
x1306
700B
Connecting Universities
dfs and similar
,
dp
,
graphs
,
trees
1800
x4020
698B
Fix a Tree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
trees
1700
x5757
696B
Puzzles
dfs and similar
,
math
,
probabilities
,
trees
1700
x3526
691D
Swaps in Permutation
dfs and similar
,
dsu
,
math
1700
x5558
690C2
Brain Network (medium)
dfs and similar
,
graphs
,
trees
1500
x3821
689B
Mike and Shortcuts
dfs and similar
,
graphs
,
greedy
,
shortest paths
1600
x6021
687E
TOF
dfs and similar
,
graphs
2900
x322
687A
NP-Hard Problem
dfs and similar
,
graphs
1500
x14471
685B
Kay and Snowflake
data structures
,
dfs and similar
,
dp
,
trees
1900
x4168
682C
Alyona and the Tree
dfs and similar
,
dp
,
graphs
,
trees
1600
x7288
681D
Gifts by the List
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2000
x1788
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x318
679C
Bear and Square Grid
dfs and similar
,
dsu
,
implementation
2400
x1157
662B
Graph Coloring
dfs and similar
,
graphs
2200
x1510
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