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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
25:23:21
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Difficulty:
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combinatorics
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
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x885
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x1574
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x430
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x999
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x6736
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x799
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2309
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6539
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15003
1930I
Counting Is Fun
combinatorics
3500
x37
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x919
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1538
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x3916
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x195
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3083
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x376
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x718
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x18500
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2248
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x743
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1599
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x18618
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x485
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x567
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1154
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1595
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x1824
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x853
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x38
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x67
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x791
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1578
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x8400
1906J
Count BFS Graph
combinatorics
,
dp
2100
x600
1906H
Twin Friends
combinatorics
,
dp
2200
x574
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x803
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x604
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x159
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3235
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6357
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x14403
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x790
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7262
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1051
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x660
1866H
Happy Sets
combinatorics
2100
x1489
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7078
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x238
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x512
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x15700
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1583
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x3969
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x22986
1854C
Expected Destruction
combinatorics
,
dp
,
math
,
probabilities
2500
x1376
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x10932
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1419
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x310
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x122
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x16678
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30457
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x819
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x23693
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21221
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1333
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2060
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x195
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6504
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2015
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1486
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x6844
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17070
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2451
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4260
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15722
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x684
1821A
Matching
combinatorics
,
math
800
x19220
1817C
Similar Polynomials
combinatorics
,
math
2400
x902
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x991
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1579
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1874
1810H
Last Number
combinatorics
,
math
2900
x128
1809G
Prediction
combinatorics
,
dp
,
math
2800
x402
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x396
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x627
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1221
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x827
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x685
1795D
Triangle Coloring
combinatorics
,
math
1600
x8273
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3285
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x369
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x657
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x7929
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3649
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3224
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x287
1784D
Wooden Spoon
combinatorics
,
dp
2400
x936
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x710
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1353
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2494
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3145
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