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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
43:51:14
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Difficulty:
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constructive algorithms
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
910C
Minimum Sum
constructive algorithms
,
greedy
,
math
1700
x1812
909F
AND-permutations
constructive algorithms
2500
x581
909B
Segments
constructive algorithms
,
math
1300
x6424
906B
Seating of Students
brute force
,
constructive algorithms
,
math
2200
x1143
901D
Weighting a Tree
constructive algorithms
,
dfs and similar
,
graphs
2700
x513
901B
GCD of Polynomials
constructive algorithms
,
math
2200
x1585
901A
Hashing Trees
constructive algorithms
,
trees
1500
x5130
899D
Shovel Sale
constructive algorithms
,
math
1800
x2769
899C
Dividing the numbers
constructive algorithms
,
graphs
,
math
1300
x8505
899A
Splitting in Teams
constructive algorithms
,
greedy
,
math
800
x10265
898E
Squares and not squares
constructive algorithms
,
greedy
1600
x4604
896B
Ithea Plays With Chtholly
binary search
,
constructive algorithms
,
games
,
greedy
,
interactive
2000
x2131
894C
Marco and GCD Sequence
constructive algorithms
,
math
1900
x4379
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4483
891B
Gluttony
constructive algorithms
,
greedy
2000
x3013
888G
Xor-MST
bitmasks
,
constructive algorithms
,
data structures
2300
x4592
886D
Restoration of string
constructive algorithms
,
graphs
,
implementation
2000
x1803
883K
Road Widening
constructive algorithms
,
greedy
,
implementation
1800
x1102
883J
Renovation
constructive algorithms
,
greedy
,
sortings
2400
x581
883B
Berland Army
constructive algorithms
,
graphs
,
greedy
2600
x378
878A
Short Program
bitmasks
,
constructive algorithms
1600
x5539
877C
Slava and tanks
constructive algorithms
1600
x5731
873D
Merge Sort
constructive algorithms
,
divide and conquer
1800
x3188
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4635
865D
Buy Low Sell High
constructive algorithms
,
data structures
,
greedy
2400
x5755
865A
Save the problem!
constructive algorithms
1400
x4333
862C
Mahmoud and Ehab and the xor
constructive algorithms
1900
x4098
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1635
856A
Set Theory
brute force
,
constructive algorithms
1600
x1444
854B
Maxim Buys an Apartment
constructive algorithms
,
math
1200
x8200
854A
Fraction
brute force
,
constructive algorithms
,
math
800
x13678
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x393
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1905
848A
From Y to Y
constructive algorithms
1600
x5132
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x321
847D
Dog Show
constructive algorithms
,
data structures
,
greedy
2200
x1217
847C
Sum of Nestings
constructive algorithms
1800
x2380
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x361
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2483
835E
The penguin's game
binary search
,
constructive algorithms
,
interactive
2400
x1176
831C
Jury Marks
brute force
,
constructive algorithms
1700
x4593
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x282
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3541
822F
Madness
constructive algorithms
,
dfs and similar
,
trees
2500
x349
820B
Mister B and Angle in Polygon
constructive algorithms
,
geometry
,
math
1300
x5269
819E
Mister B and Flight to the Moon
constructive algorithms
,
graphs
2800
x528
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x224
815B
Karen and Test
brute force
,
combinatorics
,
constructive algorithms
,
math
2200
x1382
814B
An express train to reveries
constructive algorithms
1300
x5639
814A
An abandoned sentiment from past
constructive algorithms
,
greedy
,
implementation
,
sortings
900
x10445
811D
Vladik and Favorite Game
constructive algorithms
,
dfs and similar
,
graphs
,
interactive
2100
x1773
808C
Tea Party
constructive algorithms
,
greedy
,
sortings
1400
x6206
805B
3-palindrome
constructive algorithms
1000
x17018
804E
The same permutation
constructive algorithms
3100
x432
804C
Ice cream coloring
constructive algorithms
,
dfs and similar
,
greedy
2200
x1845
804A
Find Amir
constructive algorithms
,
greedy
,
math
1000
x15518
803C
Maximal GCD
constructive algorithms
,
greedy
,
math
1900
x5143
803B
Distances to Zero
constructive algorithms
1200
x6599
803A
Maximal Binary Matrix
constructive algorithms
1400
x4946
802H
Fake News (medium)
constructive algorithms
,
strings
2200
x467
801B
Valued Keys
constructive algorithms
,
greedy
,
strings
900
x10393
798E
Mike and code of a permutation
constructive algorithms
,
data structures
,
graphs
,
sortings
3000
x492
798D
Mike and distribution
constructive algorithms
,
sortings
2400
x1928
798A
Mike and palindrome
brute force
,
constructive algorithms
,
strings
1000
x21875
796D
Police Stations
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
2100
x5789
796C
Bank Hacking
constructive algorithms
,
data structures
,
dp
,
trees
1900
x3059
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x254
788D
Finding lines
constructive algorithms
,
divide and conquer
,
interactive
3000
x373
788B
Weird journey
combinatorics
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2100
x2598
780E
Underground Lab
constructive algorithms
,
dfs and similar
,
graphs
2100
x2596
779C
Dishonest Sellers
constructive algorithms
,
greedy
,
sortings
1200
x11900
779A
Pupils Redistribution
constructive algorithms
,
math
1000
x9336
778D
Parquet Re-laying
constructive algorithms
2700
x533
777A
Shell Game
constructive algorithms
,
implementation
,
math
1000
x10310
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x448
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x21153
774H
Repairing Of String
*special problem
,
constructive algorithms
2200
x261
774D
Lie or Truth
*special problem
,
constructive algorithms
,
implementation
,
sortings
1500
x1955
774C
Maximum Number
*special problem
,
constructive algorithms
,
greedy
,
implementation
1200
x4095
773C
Prairie Partition
binary search
,
constructive algorithms
,
greedy
,
math
2200
x961
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1389
771B
Bear and Different Names
constructive algorithms
,
greedy
1500
x6928
768B
Code For 1
constructive algorithms
,
dfs and similar
,
divide and conquer
1600
x6001
768A
Oath of the Night's Watch
constructive algorithms
,
sortings
900
x27748
766E
Mahmoud and a xor trip
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
math
,
trees
2100
x3038
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x33211
766A
Mahmoud and Longest Uncommon Subsequence
constructive algorithms
,
strings
1000
x30738
765D
Artsem and Saunders
constructive algorithms
,
dsu
,
math
1700
x2486
764B
Timofey and cubes
constructive algorithms
,
implementation
900
x11896
763B
Timofey and rectangles
constructive algorithms
,
geometry
2100
x2825
761E
Dasha and Puzzle
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
2000
x2183
761D
Dasha and Very Difficult Problem
binary search
,
brute force
,
constructive algorithms
,
greedy
,
sortings
1700
x4066
761A
Dasha and Stairs
brute force
,
constructive algorithms
,
implementation
,
math
1000
x14547
758D
Ability To Convert
constructive algorithms
,
dp
,
greedy
,
math
,
strings
2000
x2735
758C
Unfair Poll
binary search
,
constructive algorithms
,
implementation
,
math
1700
x3885
756A
Pavel and barbecue
constructive algorithms
,
dfs and similar
1700
x3072
755E
PolandBall and White-Red graph
constructive algorithms
,
graphs
,
shortest paths
2400
x855
754C
Vladik and chat
brute force
,
constructive algorithms
,
dp
,
implementation
,
strings
2200
x943
754A
Lesha and array splitting
constructive algorithms
,
greedy
,
implementation
1200
x8725
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x308
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