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Before contest
Codeforces Round 987 (Div. 2)
06:01:48
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→ Filter Problems
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
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6676
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x5827
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1358
216C
Hiring Staff
greedy
1800
x1850
216B
Forming Teams
dfs and similar
,
implementation
1700
x6399
215D
Hot Days
greedy
1900
x1604
215B
Olympic Medal
greedy
,
math
1300
x5598
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4980
213B
Numbers
combinatorics
,
dp
1900
x1784
213A
Game
dfs and similar
,
greedy
1700
x1726
212E
IT Restaurants
dfs and similar
,
dp
,
trees
1500
x1759
209A
Multicolored Marbles
dp
,
math
1600
x2368
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1873
208B
Solitaire
dfs and similar
,
dp
1900
x1364
207D9
The Beaver's Problem - 3
1800
x88
207D7
The Beaver's Problem - 3
1600
x101
207D5
The Beaver's Problem - 3
1600
x142
207D1
The Beaver's Problem - 3
1800
x117
207B3
Military Trainings
1700
x164
207B2
Military Trainings
1900
x189
207B1
Military Trainings
1600
x273
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
204B
Little Elephant and Cards
binary search
,
data structures
1500
x5266
204A
Little Elephant and Interval
binary search
,
combinatorics
,
dp
1500
x5836
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1418
203C
Photographer
greedy
,
sortings
1400
x5701
203B
Game on Paper
brute force
,
implementation
1300
x2608
202B
Brand New Easy Problem
brute force
1700
x818
201B
Guess That Car!
math
,
ternary search
1800
x1267
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x3011
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x916
200C
Football Championship
brute force
,
implementation
1800
x1060
199B
Special Olympics
geometry
1900
x805
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
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
193A
Cutting Figure
constructive algorithms
,
graphs
,
trees
1700
x4014
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10433
191C
Fools and Roads
data structures
,
dfs and similar
,
trees
1900
x7283
191B
Demonstration
greedy
1700
x1013
191A
Dynasty Puzzles
dp
1500
x4027
190D
Non-Secret Cypher
two pointers
1900
x2341
190C
STL
dfs and similar
1500
x2849
190B
Surrounded
geometry
1800
x2855
189B
Counting Rhombi
brute force
,
math
1300
x3954
189A
Cut Ribbon
brute force
,
dp
1300
x67601
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
188C
LCM
*special problem
,
implementation
,
math
1400
x454
188B
A + Reverse B
*special problem
,
implementation
1300
x735
187B
AlgoRace
dp
,
shortest paths
1800
x1985
187A
Permutations
greedy
1500
x2812
185B
Mushroom Scientists
math
,
ternary search
1800
x1641
185A
Plant
math
1300
x5949
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
181B
Number of Triplets
binary search
,
brute force
1300
x3046
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1785
180D
Name
greedy
,
strings
1900
x731
180C
Letter
dp
1400
x7462
180A
Defragmentation
implementation
1800
x541
178F1
Representative Sampling
1800
x404
178E1
The Beaver's Problem - 2
1900
x289
178D2
Magic Squares
1900
x273
178D1
Magic Squares
1500
x643
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
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
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2576
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2580
176B
Word Cut
dp
1700
x1833
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
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
172D
Calendar Reform
*special problem
,
number theory
1500
x1401
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1146
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
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