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Before contest
Codeforces Round 987 (Div. 2)
09:02:52
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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
208D
Prizes, Prizes, more Prizes
implementation
1200
x7599
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1873
208B
Solitaire
dfs and similar
,
dp
1900
x1364
208A
Dubstep
strings
900
x89171
207D9
The Beaver's Problem - 3
1800
x88
207D8
The Beaver's Problem - 3
2300
x95
207D7
The Beaver's Problem - 3
1600
x101
207D6
The Beaver's Problem - 3
2100
x84
207D5
The Beaver's Problem - 3
1600
x142
207D4
The Beaver's Problem - 3
2100
x154
207D3
The Beaver's Problem - 3
2000
x136
207D2
The Beaver's Problem - 3
2000
x110
207D10
The Beaver's Problem - 3
2100
x82
207D1
The Beaver's Problem - 3
1800
x117
207C3
Game with Two Trees
data structures
2700
x132
207C2
Game with Two Trees
2200
x90
207C1
Game with Two Trees
2100
x107
207B3
Military Trainings
1700
x164
207B2
Military Trainings
1900
x189
207B1
Military Trainings
1600
x273
207A3
Beaver's Calculator 1.0
greedy
2000
x216
207A2
Beaver's Calculator 1.0
greedy
1800
x243
207A1
Beaver's Calculator 1.0
greedy
1600
x294
205B
Little Elephant and Sorting
brute force
,
greedy
1400
x6040
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x22525
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1171
204D
Little Elephant and Retro Strings
dp
2400
x584
204C
Little Elephant and Furik and Rubik
math
,
probabilities
2000
x1119
204B
Little Elephant and Cards
binary search
,
data structures
1500
x5266
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x5836
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x281
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1418
203C
Photographer
greedy
,
sortings
1400
x5701
203B
Game on Paper
brute force
,
implementation
1300
x2608
203A
Two Problems
brute force
,
implementation
1200
x4184
202B
Brand New Easy Problem
brute force
1700
x818
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x16998
201E
Thoroughly Bureaucratic Organization
binary search
,
combinatorics
2600
x427
201D
Brand New Problem
bitmasks
,
brute force
,
dp
2600
x418
201C
Fragile Bridges
dp
2000
x1366
201B
Guess That Car!
math
,
ternary search
1800
x1267
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x3011
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x344
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x916
200C
Football Championship
brute force
,
implementation
1800
x1060
200B
Drinks
implementation
,
math
800
x117804
200A
Cinema
brute force
,
data structures
2400
x686
199B
Special Olympics
geometry
1900
x805
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x26716
198E
Gripping Story
binary search
,
data structures
,
sortings
2400
x420
198D
Cube Snake
constructive algorithms
2700
x107
198C
Delivering Carcinogen
binary search
,
geometry
2400
x375
198B
Jumping on Walls
shortest paths
1400
x4349
198A
About Bacteria
implementation
,
math
1700
x3155
197B
Limit
math
1400
x4644
197A
Plate Game
constructive algorithms
,
games
,
math
1600
x6355
196E
Opening Portals
dsu
,
graphs
,
shortest paths
2600
x945
196D
The Next Good String
data structures
,
greedy
,
hashing
,
strings
2800
x533
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x960
196B
Infinite Maze
dfs and similar
,
graphs
2000
x2224
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5408
195E
Building Forest
data structures
,
dsu
,
graphs
2000
x721
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x1042
195C
Try and Catch
expression parsing
,
implementation
1800
x1145
195B
After Training
data structures
,
implementation
,
math
1300
x5209
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x9073
194B
Square
math
1200
x3540
194A
Exams
implementation
,
math
900
x9902
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x342
193D
Two Segments
data structures
2900
x524
193C
Hamming Distance
constructive algorithms
,
greedy
,
math
,
matrices
2400
x516
193B
Xor
brute force
2000
x1013
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x4014
192B
Walking in the Rain
brute force
,
implementation
1100
x6275
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10433
191E
Thwarting Demonstrations
binary search
,
data structures
,
trees
2200
x855
191D
Metro Scheme
graphs
,
greedy
2700
x365
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x7283
191B
Demonstration
greedy
1700
x1013
191A
Dynasty Puzzles
dp
1500
x4027
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1551
190D
Non-Secret Cypher
two pointers
1900
x2341
190C
STL
dfs and similar
1500
x2849
190B
Surrounded
geometry
1800
x2855
190A
Vasya and the Bus
greedy
,
math
1100
x5889
189B
Counting Rhombi
brute force
,
math
1300
x3954
189A
Cut Ribbon
brute force
,
dp
1300
x67594
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x266
188G
Array Sorting
*special problem
,
implementation
1600
x334
188F
Binary Notation
*special problem
,
implementation
1400
x301
188E
HQ9+
*special problem
,
implementation
1400
x500
188D
Asterisks
*special problem
,
implementation
1100
x682
188C
LCM
*special problem
,
implementation
,
math
1400
x454
188B
A + Reverse B
*special problem
,
implementation
1300
x735
188A
Hexagonal Numbers
*special problem
1100
x778
187E
Heaven Tour
data structures
,
greedy
2900
x103
187D
BRT Contract
data structures
2800
x537
187C
Weak Memory
dfs and similar
,
dsu
2000
x1359
187B
AlgoRace
dp
,
shortest paths
1800
x1985
187A
Permutations
greedy
1500
x2812
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