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Before contest
Codeforces Round 946 (Div. 3)
38:09:10
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Difficulty:
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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
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3735
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x16507
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19295
1788A
One and Two
brute force
,
implementation
,
math
800
x27752
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x201
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x396
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x632
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2185
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3271
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x6736
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x12734
1787A
Exponential Equation
constructive algorithms
,
math
800
x18762
1786B
Cake Assembly Line
brute force
,
sortings
1300
x8640
1786A2
Alternating Deck (hard version)
implementation
800
x11244
1786A1
Non-alternating Deck (easy version)
implementation
800
x13627
1784F
Minimums or Medians
3400
x170
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x303
1784D
Wooden Spoon
combinatorics
,
dp
2400
x955
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1531
1784B
Letter Exchange
constructive algorithms
1900
x3220
1784A
Monsters (easy version)
brute force
,
greedy
1000
x14535
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x411
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x967
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2034
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4195
1783C
Yet Another Tournament
binary search
,
greedy
,
sortings
1700
x8845
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x17194
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x27416
1781H2
Window Signals (hard version)
3500
x87
1781H1
Window Signals (easy version)
3200
x113
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x215
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x737
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1266
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5264
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7083
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13246
1781A
Parallel Projection
geometry
,
math
800
x14864
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x671
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1381
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1310
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4657
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x16644
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21091
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x131
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x302
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1222
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1692
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7531
1779C
Least Prefix Sum
data structures
,
greedy
1600
x11858
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x23042
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x22904
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x599
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x823
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2566
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7694
1778B
The Forbidden Permutation
greedy
,
math
1300
x12920
1778A
Flip Flop Sum
greedy
,
implementation
800
x23790
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x823
1777E
Edge Reverse
binary search
,
dfs and similar
,
graphs
,
trees
2200
x1700
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3230
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7862
1777B
Emordnilap
combinatorics
,
greedy
,
math
900
x16615
1777A
Everybody Likes Good Arrays!
greedy
,
math
800
x21405
1776N
Count Permutations
math
3500
x71
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x352
1776L
Controllers
binary search
,
math
1500
x5247
1776K
Uniform Chemistry
dp
,
math
3200
x64
1776J
Italian Data Centers
graphs
,
shortest paths
2500
x609
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x641
1776H
Beppa and SwerChat
two pointers
1300
x6038
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x1956
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3247
1776E
Crossing the Railways
data structures
,
dp
3500
x62
1776D
Teamwork
constructive algorithms
,
greedy
,
math
2800
x339
1776C
Library game
games
,
greedy
,
interactive
,
sortings
2500
x759
1776B
Vittorio Plays with LEGO Bricks
dp
,
geometry
2200
x1245
1776A
Walking Boy
greedy
800
x6774
1775F
Laboratory on Pluto
constructive algorithms
,
dp
,
greedy
,
math
2500
x743
1775E
The Human Equation
greedy
,
implementation
2100
x3042
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5798
1775C
Interesting Sequence
bitmasks
,
math
1600
x9700
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12620
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x18301
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19331
1774H
Maximum Permutation
constructive algorithms
3500
x129
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x367
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x643
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1023
1774E
Two Chess Pieces
dfs and similar
,
dp
,
greedy
,
trees
1900
x3319
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7447
1774C
Ice and Fire
constructive algorithms
,
dp
,
greedy
1300
x11583
1774B
Coloring
constructive algorithms
,
greedy
,
math
1500
x11620
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x21963
1773L
Lisa's Sequences
dp
3500
x28
1773K
King's Puzzle
constructive algorithms
1900
x1383
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x102
1773I
Interactive Factorial Guessing
brute force
,
games
,
implementation
,
interactive
2500
x458
1773H
Hot and Cold
binary search
,
interactive
2600
x343
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x321
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