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Rayan
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Before contest
Codeforces Round 998 (Div. 3)
03:07:24
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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
153A
A + B
*special problem
1600
x828
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x490
152D
Frames
brute force
2600
x245
152C
Pocket Book
combinatorics
1400
x10759
152B
Steps
binary search
,
implementation
1300
x6833
152A
Marks
implementation
900
x17061
151B
Phone Numbers
implementation
,
strings
1200
x6438
151A
Soft Drinking
implementation
,
math
800
x77050
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x879
150D
Mission Impassable
dp
,
strings
2600
x628
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x647
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4309
150A
Win or Freeze
games
,
math
,
number theory
1400
x7979
149E
Martian Strings
string suffix structures
,
strings
2300
x2309
149D
Coloring Brackets
dp
1900
x3959
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5430
149B
Martian Clock
implementation
1600
x2288
149A
Business trip
greedy
,
implementation
,
sortings
900
x40759
148E
Porcelain
dp
1900
x4143
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7445
148C
Terse princess
constructive algorithms
,
greedy
1700
x3165
148B
Escape
implementation
,
math
1500
x5568
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x96000
147B
Smile House
binary search
,
graphs
,
matrices
2500
x812
147A
Punctuation
implementation
,
strings
1300
x3698
146B
Lucky Mask
brute force
,
implementation
1300
x4448
146A
Lucky Ticket
implementation
800
x15344
145E
Lucky Queries
data structures
2400
x3311
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x248
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1925
145B
Lucky Number 2
constructive algorithms
1800
x2238
145A
Lucky Conversion
greedy
,
implementation
1200
x7203
144E
Competition
data structures
,
greedy
2200
x606
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4097
144C
Anagram Search
implementation
,
strings
1500
x4044
144B
Meeting
implementation
1300
x5331
144A
Arrival of the General
implementation
800
x99850
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x5015
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x14119
142E
Help Greg the Dwarf 2
geometry
3000
x81
142D
Help Shrek and Donkey 2
games
2600
x352
142C
Help Caretaker
brute force
,
dp
2300
x934
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2256
142A
Help Farmer
brute force
,
math
1600
x2652
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x1140
141D
Take-off Ramps
graphs
,
shortest paths
2300
x914
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2489
141B
Hopscotch
geometry
,
math
1400
x5441
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x86290
140F
New Year Snowflake
geometry
,
sortings
2600
x377
140E
New Year Garland
combinatorics
,
dp
2600
x962
140D
New Year Contest
greedy
,
sortings
1800
x2220
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4416
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1688
140A
New Year Table
geometry
,
math
1700
x4179
139B
Wallpaper
implementation
,
math
1600
x1328
139A
Petr and Book
implementation
1000
x32315
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x175
138D
World of Darkraft
dp
,
games
2500
x501
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x879
138B
Digits Permutations
greedy
1900
x1041
138A
Literature Lesson
implementation
1600
x2408
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1256
137D
Palindromes
dp
,
strings
1900
x1531
137C
History
sortings
1500
x7284
137B
Permutation
greedy
1000
x13853
137A
Postcards and photos
implementation
900
x7294
136B
Ternary Logic
implementation
,
math
1100
x4993
136A
Presents
implementation
800
x122656
135E
Weak Subsequence
combinatorics
3000
x310
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x304
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1356
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2392
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7690
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x477
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2104
134A
Average Numbers
brute force
,
implementation
1200
x4091
133B
Unary
implementation
1200
x8874
133A
HQ9+
implementation
900
x108775
132E
Bits of merry old England
flows
,
graphs
2700
x536
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x621
132C
Logo Turtle
dp
1800
x2371
132B
Piet
implementation
2100
x666
132A
Turing Tape
implementation
1300
x2801
131F
Present to Mom
binary search
,
two pointers
2000
x655
131E
Yet Another Task with Queens
sortings
1700
x1871
131D
Subway
dfs and similar
,
graphs
1600
x4764
131C
The World is a Theatre
combinatorics
,
math
1400
x11447
131B
Opposites Attract
implementation
,
math
1200
x7094
131A
cAPS lOCK
implementation
,
strings
1000
x88206
130J
Date calculation
*special problem
1800
x343
130I
Array sorting
*special problem
,
sortings
2300
x170
130H
Balanced brackets
*special problem
1600
x618
130G
CAPS LOCK ON
*special problem
1700
x289
130F
Prime factorization
*special problem
1600
x281
130E
Tribonacci numbers
*special problem
1600
x299
130D
Exponentiation
*special problem
1500
x399
130C
Decimal sum
*special problem
1500
x509
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x540
130A
Hexagonal numbers
*special problem
,
implementation
900
x1670
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