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Before contest
Codeforces Round 987 (Div. 2)
08:39:23
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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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Custom test
Problems
#
Name
186B
Growing Mushrooms
greedy
,
sortings
1200
x5609
186A
Comparing Strings
implementation
,
strings
1100
x17123
185E
Soap Time! - 2
binary search
,
data structures
3000
x143
185D
Visit of the Great
math
,
number theory
2600
x430
185C
Clever Fat Rat
dp
2500
x138
185B
Mushroom Scientists
math
,
ternary search
1800
x1641
185A
Plant
math
1300
x5948
183E
Candy Shop
greedy
2900
x138
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x403
183C
Cyclic Coloring
dfs and similar
2200
x621
183B
Zoo
brute force
,
geometry
1700
x698
183A
Headquarters
constructive algorithms
,
math
1700
x549
182E
Wooden Fence
dp
1800
x1463
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x8096
182C
Optimal Sum
data structures
,
greedy
2000
x742
182B
Vasya's Calendar
implementation
1000
x6945
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x287
181B
Number of Triplets
binary search
,
brute force
1300
x3046
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x7148
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2529
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1785
180D
Name
greedy
,
strings
1900
x731
180C
Letter
dp
1400
x7462
180B
Divisibility Rules
math
,
number theory
2300
x347
180A
Defragmentation
implementation
1800
x541
178F3
Representative Sampling
2500
x434
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x351
178F1
Representative Sampling
1800
x404
178E3
The Beaver's Problem - 2
2300
x201
178E2
The Beaver's Problem - 2
2000
x230
178E1
The Beaver's Problem - 2
1900
x289
178D3
Magic Squares
2100
x250
178D2
Magic Squares
1900
x273
178D1
Magic Squares
1500
x643
178C3
Smart Beaver and Resolving Collisions
2000
x324
178C2
Smart Beaver and Resolving Collisions
1900
x307
178C1
Smart Beaver and Resolving Collisions
1600
x492
178B3
Greedy Merchants
1800
x1221
178B2
Greedy Merchants
1600
x682
178B1
Greedy Merchants
1600
x764
178A3
Educational Game
greedy
1100
x1455
178A2
Educational Game
greedy
1000
x1636
178A1
Educational Game
1000
x1617
177G2
Fibonacci Strings
matrices
,
strings
2600
x193
177G1
Fibonacci Strings
strings
2400
x185
177F2
Script Generation
2300
x210
177F1
Script Generation
1800
x305
177E2
Space Voyage
binary search
1900
x432
177E1
Space Voyage
binary search
1700
x616
177D2
Encrypting Messages
data structures
1500
x2001
177D1
Encrypting Messages
brute force
1200
x2180
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2576
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2580
177B2
Rectangular Game
number theory
1200
x3026
177B1
Rectangular Game
number theory
1000
x4187
177A2
Good Matrix Elements
implementation
800
x7368
177A1
Good Matrix Elements
implementation
800
x8730
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1189
176D
Hyper String
dp
2500
x326
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x482
176B
Word Cut
dp
1700
x1833
176A
Trading Business
greedy
,
sortings
1200
x1514
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x66
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x265
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x297
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1319
175B
Plane of Tanks: Pro
implementation
1400
x1425
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2401
174C
Range Increments
data structures
,
greedy
1800
x1100
174B
File List
dp
,
greedy
,
implementation
1400
x2244
174A
Problem About Equation
math
1100
x2899
173E
Camping Groups
data structures
,
sortings
2600
x564
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x250
173C
Spiral Maximum
brute force
,
dp
1900
x988
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x3161
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2298
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x271
172D
Calendar Reform
*special problem
,
number theory
1500
x1401
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1146
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2785
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6156
171H
A polyline
*special problem
,
implementation
1700
x282
171G
Mysterious numbers - 2
*special problem
1600
x932
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1284
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1466
171D
Broken checker
*special problem
,
brute force
1300
x2580
171C
A Piece of Cake
*special problem
,
implementation
2000
x1095
171B
Star
*special problem
,
combinatorics
1300
x4071
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4483
169B
Replacing Digits
greedy
1100
x3304
169A
Chores
sortings
800
x6973
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1222
168A
Wizards and Demonstration
implementation
,
math
900
x10611
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x580
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x197
167C
Wizards and Numbers
games
,
math
2300
x672
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2168
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2044
166E
Tetrahedron
dp
,
math
,
matrices
1500
x21274
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x361
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