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Before contest
Codeforces Round 946 (Div. 3)
25:10:33
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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
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x56
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x120
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1288
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x146
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1016
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7754
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x210
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x4959
1952E
Sweep Line
combinatorics
,
games
,
math
x210
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x256
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1156
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2123
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x600
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1261
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x373
1942E
Farm Game
combinatorics
,
games
2300
x1457
1935D
Exam in MAC
binary search
,
combinatorics
,
implementation
,
math
1800
x7378
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x875
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2465
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6997
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15983
1930I
Counting Is Fun
combinatorics
3500
x51
1930E
2..3...4.... Wonderful! Wonderful!
combinatorics
,
dp
,
math
2400
x992
1929F
Sasha and the Wedding Binary Search Tree
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
math
,
trees
2300
x1637
1929D
Sasha and a Walk in the City
combinatorics
,
dp
,
math
,
trees
1900
x4198
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x211
1925D
Good Trip
combinatorics
,
dp
,
math
,
probabilities
1900
x3250
1924E
Paper Cutting Again
combinatorics
,
probabilities
3100
x394
1924D
Balanced Subsequences
combinatorics
,
dp
,
math
2700
x778
1922B
Forming Triangles
combinatorics
,
constructive algorithms
,
math
,
sortings
1200
x19107
1920E
Counting Binary Strings
combinatorics
,
dp
,
math
2100
x2379
1919E
Counting Prefixes
combinatorics
,
constructive algorithms
,
dp
,
implementation
,
math
2600
x778
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1666
1917B
Erase First or Second Letter
brute force
,
combinatorics
,
data structures
,
dp
,
strings
1100
x19534
1916H2
Matrix Rank (Hard Version)
combinatorics
,
dp
,
math
,
matrices
,
string suffix structures
2700
x502
1916H1
Matrix Rank (Easy Version)
brute force
,
combinatorics
,
dp
,
math
,
matrices
2700
x584
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1228
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1679
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2061
1912B
Blueprint for Seating
combinatorics
,
divide and conquer
,
math
2100
x933
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x42
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x77
1909F2
Small Permutation Problem (Hard Version)
combinatorics
,
dp
,
math
2500
x835
1909F1
Small Permutation Problem (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2200
x1644
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x8876
1906J
Count BFS Graph
combinatorics
,
dp
2100
x640
1906H
Twin Friends
combinatorics
,
dp
2200
x611
1905E
One-X
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
2400
x857
1895F
Fancy Arrays
combinatorics
,
dp
,
math
,
matrices
2600
x631
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x179
1886D
Monocarp and the Set
combinatorics
,
data structures
,
math
2100
x3337
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6631
1879C
Make it Alternating
combinatorics
,
dp
,
greedy
1300
x15027
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x819
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7551
1868C
Travel Plan
combinatorics
,
dp
,
implementation
,
math
,
trees
2400
x1081
1866M
Mighty Rock Tower
brute force
,
combinatorics
,
dp
,
math
,
probabilities
2400
x693
1866H
Happy Sets
combinatorics
2100
x1536
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7242
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x252
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x569
1862D
Ice Cream Balls
binary search
,
combinatorics
,
constructive algorithms
,
math
1300
x16105
1861E
Non-Intersecting Subpermutations
combinatorics
,
dp
,
implementation
,
math
2300
x1628
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x4099
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23948
1854C
Expected Destruction
combinatorics
,
dp
,
math
,
probabilities
2500
x1407
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x11280
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1452
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x317
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x131
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x17085
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31198
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x929
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24762
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21553
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1376
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2103
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x203
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6745
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2061
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1532
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7126
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17545
1824B2
LuoTianyi and the Floating Islands (Hard Version)
combinatorics
,
dfs and similar
,
math
,
probabilities
,
trees
2300
x2499
1824B1
LuoTianyi and the Floating Islands (Easy Version)
combinatorics
,
math
,
probabilities
,
trees
1800
x4346
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x15827
1821F
Timber
combinatorics
,
dp
,
fft
,
math
2600
x708
1821A
Matching
combinatorics
,
math
800
x19387
1817C
Similar Polynomials
combinatorics
,
math
2400
x927
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1047
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1626
1811G1
Vlad and the Nice Paths (easy version)
combinatorics
,
dp
,
math
2100
x1920
1810H
Last Number
combinatorics
,
math
2900
x130
1809G
Prediction
combinatorics
,
dp
,
math
2800
x416
1808E3
Minibuses on Venus (hard version)
brute force
,
combinatorics
,
dp
,
math
2800
x419
1808E2
Minibuses on Venus (medium version)
combinatorics
,
divide and conquer
,
dp
,
matrices
2500
x650
1808E1
Minibuses on Venus (easy version)
combinatorics
,
divide and conquer
,
dp
2200
x1254
1806D
DSU Master
combinatorics
,
dp
,
dsu
,
math
2500
x851
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x705
1795D
Triangle Coloring
combinatorics
,
math
1600
x8508
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