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Codeforces Round 950 (Div. 3)
15:03:23
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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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#
Name
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x371
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x740
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1695
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11728
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x14994
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x17588
1844A
Subtraction Game
constructive algorithms
,
games
800
x24000
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1488
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x5030
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11223
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x17181
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31398
1843B
Long Long
greedy
,
math
,
two pointers
800
x28193
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33169
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x109
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x569
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x943
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1253
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1551
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3942
1842C
Tenzing and Balls
dp
1500
x11860
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15912
1842A
Tenzing and Tsondu
games
,
math
800
x19540
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x478
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x1904
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4181
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7375
1841B
Keep it Beautiful
implementation
1000
x20744
1841A
Game with Board
constructive algorithms
,
games
800
x24329
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x906
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2250
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1721
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7618
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x12989
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x25063
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21653
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32875
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1167
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2195
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11457
1839B
Lamps
greedy
,
sortings
1100
x14559
1839A
The Good Array
greedy
,
implementation
,
math
800
x17136
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x303
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1382
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3099
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13609
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x15901
1838A
Blackboard List
constructive algorithms
,
math
800
x21129
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2090
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2119
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13636
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21247
1837B
Comparison String
greedy
900
x27009
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x29631
1836B
Astrophysicists
greedy
,
math
1100
x12319
1836A
Destroyer
implementation
,
sortings
800
x19900
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x152
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x204
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x454
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x946
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x909
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7500
1834F
Typewriter
brute force
,
math
2500
x492
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2087
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4385
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12733
1834B
Maximum Strength
greedy
,
math
1000
x14635
1834A
Unit Array
greedy
,
math
800
x21774
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4993
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6830
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10610
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12803
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25610
1833B
Restore the Weather
greedy
,
sortings
900
x25555
1833A
Musical Puzzle
implementation
,
strings
800
x31748
1832F
Zombies
binary search
,
dp
3200
x254
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2071
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1811
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2815
1832C
Contrast Value
greedy
,
implementation
1200
x18651
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19993
1832A
New Palindrome
strings
800
x25005
1831B
Array merging
constructive algorithms
,
greedy
1000
x18828
1831A
Twin Permutations
constructive algorithms
800
x24609
1830F
The Third Grace
data structures
,
dp
3200
x228
1830E
Bully Sort
data structures
,
math
3500
x232
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x608
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1543
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4631
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12598
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7172
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9558
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16360
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18605
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24495
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27353
1829B
Blank Space
implementation
800
x41532
1829A
Love Story
implementation
,
strings
800
x46745
1828B
Permutation Swap
math
,
number theory
900
x21009
1828A
Divisible Array
constructive algorithms
,
math
800
x23107
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