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Before contest
Codeforces Round 987 (Div. 2)
10:41:59
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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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Status
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Custom test
Problems
#
Name
1714B
Remove Prefix
data structures
,
greedy
,
implementation
800
x30567
1714A
Everyone Loves to Sleep
implementation
,
math
900
x29875
1713C
Build Permutation
constructive algorithms
,
dp
,
math
1200
x17466
1713B
Optimal Reduction
constructive algorithms
,
sortings
1000
x21397
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x22035
1712C
Sort Zero
greedy
,
sortings
1100
x19929
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21651
1712A
Wonderful Permutation
greedy
,
implementation
800
x24151
1711A
Perfect Permutation
constructive algorithms
800
x25244
1709B
Also Try Minecraft
data structures
,
dp
,
implementation
900
x22913
1709A
Three Doors
brute force
,
greedy
,
implementation
,
math
800
x29733
1708B
Difference of GCDs
constructive algorithms
,
math
1100
x20978
1708A
Difference Operations
greedy
,
math
800
x21828
1706B
Making Towers
dp
,
greedy
,
math
1100
x16612
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x23011
1705B
Mark the Dust Sweeper
constructive algorithms
,
greedy
,
implementation
900
x23108
1705A
Mark the Photographer
greedy
,
sortings
800
x25331
1704C
Virus
greedy
,
implementation
,
sortings
1200
x16121
1704B
Luke is a Foodie
brute force
,
greedy
,
implementation
1000
x18465
1704A
Two 0-1 Sequences
constructive algorithms
,
greedy
800
x16042
1703E
Mirror Grid
implementation
1200
x18713
1703D
Double Strings
brute force
,
data structures
,
strings
1100
x25897
1703C
Cypher
brute force
,
implementation
,
strings
800
x35947
1703B
ICPC Balloons
data structures
,
implementation
800
x50154
1703A
YES or YES?
brute force
,
implementation
,
strings
800
x71266
1702D
Not a Cheap String
greedy
1000
x23836
1702C
Train and Queries
data structures
,
greedy
1100
x22606
1702B
Polycarp Writes a String from Memory
greedy
800
x27769
1702A
Round Down the Price
constructive algorithms
800
x35057
1701B
Permutation
greedy
800
x20238
1701A
Grass Field
implementation
800
x26421
1700B
Palindromic Numbers
constructive algorithms
,
implementation
,
math
1100
x18838
1700A
Optimal Path
constructive algorithms
,
greedy
,
math
800
x22943
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19885
1699A
The Third Three Number Problem
constructive algorithms
,
math
800
x24072
1698B
Rising Sand
constructive algorithms
,
greedy
,
implementation
800
x20977
1698A
XOR Mixup
bitmasks
,
brute force
800
x29368
1697B
Promo
greedy
,
sortings
900
x26905
1697A
Parkway Walk
greedy
,
implementation
800
x25794
1696B
NIT Destroys the Universe
greedy
900
x21842
1696A
NIT orz!
bitmasks
,
greedy
800
x18875
1695B
Circle Game
games
,
greedy
1000
x18568
1695A
Subrectangle Guess
games
800
x16368
1694B
Paranoid String
constructive algorithms
,
greedy
1200
x19239
1694A
Creep
greedy
,
implementation
800
x22713
1692E
Binary Deque
binary search
,
implementation
,
two pointers
1200
x22422
1692D
The Clock
brute force
,
implementation
1100
x19559
1692C
Where's the Bishop?
implementation
800
x34518
1692B
All Distinct
greedy
,
sortings
800
x34495
1692A
Marathon
implementation
800
x66499
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x23480
1691A
Beat The Odds
brute force
,
greedy
,
math
800
x30650
1690D
Black and White Stripe
implementation
,
two pointers
1000
x30361
1690C
Restoring the Duration of Tasks
data structures
,
greedy
,
implementation
800
x26295
1690B
Array Decrements
greedy
,
implementation
800
x25534
1690A
Print a Pedestal (Codeforces logo?)
constructive algorithms
,
greedy
800
x33694
1689B
Mystic Permutation
data structures
,
greedy
900
x17599
1689A
Lex String
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
800
x16823
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x18331
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x21759
1686B
Odd Subarrays
dp
,
greedy
800
x18327
1686A
Everything Everywhere All But One
greedy
800
x20520
1685A
Circular Local MiniMax
constructive algorithms
,
greedy
,
sortings
1100
x17202
1684B
Z mod X = C
constructive algorithms
,
math
800
x21036
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x23942
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x18865
1682A
Palindromic Indices
greedy
,
strings
800
x19328
1681C
Double Sort
implementation
,
sortings
1200
x17462
1681B
Card Trick
implementation
,
math
800
x20162
1681A
Game with Cards
games
,
greedy
800
x21031
1680B
Robots
implementation
800
x18421
1680A
Minimums and Maximums
brute force
,
math
800
x21622
1679B
Stone Age Problem
data structures
,
implementation
1200
x18869
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x24751
1678B1
Tokitsukaze and Good 01-String (easy version)
implementation
800
x15975
1678A
Tokitsukaze and All Zero Sequence
implementation
800
x18224
1676E
Eating Queries
binary search
,
greedy
,
sortings
1100
x26899
1676D
X-Sum
brute force
,
greedy
,
implementation
1000
x25404
1676C
Most Similar Words
brute force
,
greedy
,
implementation
,
implementation
,
math
,
strings
800
x30382
1676B
Equal Candies
greedy
,
math
,
sortings
800
x49169
1676A
Lucky?
implementation
800
x65301
1675C
Detective Task
implementation
1100
x18328
1675B
Make It Increasing
greedy
,
implementation
900
x27649
1675A
Food for Animals
greedy
,
math
800
x33452
1674D
A-B-C Sort
constructive algorithms
,
implementation
,
sortings
1200
x16469
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x23780
1674B
Dictionary
combinatorics
,
math
800
x26525
1674A
Number Transformation
constructive algorithms
,
math
800
x26405
1673B
A Perfectly Balanced String?
brute force
,
greedy
,
strings
1100
x15401
1673A
Subtle Substring Subtraction
games
,
greedy
,
strings
800
x18469
1672C
Unequal Array
constructive algorithms
,
greedy
,
implementation
1100
x13279
1672B
I love AAAB
constructive algorithms
,
implementation
800
x15885
1672A
Log Chopping
games
,
implementation
,
math
800
x16134
1671C
Dolce Vita
binary search
,
brute force
,
greedy
,
math
1200
x17475
1671B
Consecutive Points Segment
brute force
,
math
,
sortings
1000
x18614
1671A
String Building
implementation
800
x20548
1670B
Dorms War
brute force
,
implementation
,
strings
1100
x12790
1670A
Prof. Slim
greedy
,
implementation
,
sortings
800
x15458
1669G
Fall Down
dfs and similar
,
implementation
1200
x18544
1669F
Eating Candies
binary search
,
data structures
,
greedy
,
two pointers
1100
x26518
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