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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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Difficulty:
—
implementation
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
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7583
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32727
1839A
The Good Array
greedy
,
implementation
,
math
800
x17116
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2078
1836A
Destroyer
implementation
,
sortings
800
x19811
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x144
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7470
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2075
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4367
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4965
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6755
1833A
Musical Puzzle
implementation
,
strings
800
x31667
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1801
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2805
1832C
Contrast Value
greedy
,
implementation
1200
x18402
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9479
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18343
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24371
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27236
1829B
Blank Space
implementation
800
x41157
1829A
Love Story
implementation
,
strings
800
x46249
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1510
1826A
Trust Nobody
brute force
,
greedy
,
implementation
,
sortings
1200
x14554
1824A
LuoTianyi and the Show
greedy
,
implementation
1400
x10848
1822A
TubeTube Feed
brute force
,
implementation
800
x23677
1821C
Tear It Apart
brute force
,
implementation
,
math
,
strings
1300
x13641
1820A
Yura's New Name
implementation
,
strings
800
x16379
1819C
The Fox and the Complete Tree Traversal
constructive algorithms
,
dp
,
implementation
,
math
,
trees
2400
x1399
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3441
1818A
Politics
greedy
,
implementation
800
x12717
1817D
Toy Machine
constructive algorithms
,
games
,
implementation
2700
x673
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2871
1814A
Coins
implementation
,
math
800
x25890
1812G
Colour Vision
*special problem
,
implementation
x528
1812B
Was it Rated?
*special problem
,
*special problem
,
*special problem
,
brute force
,
implementation
x5585
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1737
1811D
Umka and a Long Flight
constructive algorithms
,
implementation
,
math
1600
x7071
1811B
Conveyor Belts
implementation
,
math
1000
x19772
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x711
1809E
Two Tanks
binary search
,
dp
,
implementation
,
math
2400
x793
1809A
Garland
implementation
800
x23461
1808C
Unlucky Numbers
brute force
,
dp
,
greedy
,
implementation
1900
x3597
1808A
Lucky Numbers
brute force
,
implementation
900
x17370
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17794
1807G1
Subsequence Addition (Easy Version)
brute force
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
1100
x17913
1807F
Bouncy Ball
brute force
,
dfs and similar
,
implementation
1700
x5920
1807E
Interview
binary search
,
implementation
,
interactive
1300
x11946
1807D
Odd Queries
data structures
,
implementation
900
x28946
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29284
1807A
Plus or Minus
implementation
800
x56329
1805F1
Survival of the Weakest (easy version)
binary search
,
brute force
,
implementation
,
math
,
sortings
2600
x825
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4434
1804B
Vaccination
greedy
,
implementation
1000
x13811
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12930
1802A
Likes
greedy
,
implementation
800
x15531
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x1937
1800A
Is It a Cat?
implementation
,
strings
800
x30082
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1157
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11369
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15930
1798A
Showstopper
greedy
,
implementation
,
sortings
800
x19363
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3710
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16968
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x16065
1796A
Typical Interview Problem
brute force
,
implementation
,
strings
800
x18582
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11506
1795A
Two Towers
brute force
,
implementation
,
strings
800
x23268
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1017
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1292
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5792
1791C
Prepend and Append
implementation
,
two pointers
800
x40906
1791B
Following Directions
geometry
,
implementation
800
x42047
1791A
Codeforces Checking
implementation
,
strings
800
x55474
1790C
Premutation
brute force
,
implementation
,
math
1000
x23022
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x35743
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x521
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x768
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1580
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8115
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15821
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x796
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19303
1788A
One and Two
brute force
,
implementation
,
math
800
x27806
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x632
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3274
1786A2
Alternating Deck (hard version)
implementation
800
x11247
1786A1
Non-alternating Deck (easy version)
implementation
800
x13632
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x411
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4199
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1269
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7090
1778A
Flip Flop Sum
greedy
,
implementation
800
x23796
1775E
The Human Equation
greedy
,
implementation
2100
x3043
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19336
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x644
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1023
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7458
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x458
1773B
BinCoin
binary search
,
divide and conquer
,
hashing
,
implementation
,
probabilities
,
trees
2200
x737
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