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Codeforces Round 937 (Div. 4)
06:05:53
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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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Problems
#
Name
188B
A + Reverse B
*special problem
,
implementation
1300
x698
188A
Hexagonal Numbers
*special problem
1100
x749
187E
Heaven Tour
data structures
,
greedy
2900
x89
187D
BRT Contract
data structures
2800
x498
187C
Weak Memory
dfs and similar
,
dsu
2000
x1293
187B
AlgoRace
dp
,
shortest paths
1800
x1849
187A
Permutations
greedy
1500
x2708
186B
Growing Mushrooms
greedy
,
sortings
1200
x5249
186A
Comparing Strings
implementation
,
strings
1100
x16114
185E
Soap Time! - 2
binary search
,
data structures
3000
x101
185D
Visit of the Great
math
,
number theory
2600
x367
185C
Clever Fat Rat
dp
2500
x129
185B
Mushroom Scientists
math
,
ternary search
1800
x1593
185A
Plant
math
1300
x5655
183E
Candy Shop
greedy
2900
x127
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x388
183C
Cyclic Coloring
dfs and similar
2200
x588
183B
Zoo
brute force
,
geometry
1700
x671
183A
Headquarters
constructive algorithms
,
math
1700
x521
182E
Wooden Fence
dp
1800
x1407
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7754
182C
Optimal Sum
data structures
,
greedy
2000
x703
182B
Vasya's Calendar
implementation
1000
x6761
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x271
181B
Number of Triplets
binary search
,
brute force
1300
x2845
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x6597
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2439
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1707
180D
Name
greedy
,
strings
1900
x703
180C
Letter
dp
1400
x6971
180B
Divisibility Rules
math
,
number theory
2300
x324
180A
Defragmentation
implementation
1800
x519
178F3
Representative Sampling
2500
x387
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x310
178F1
Representative Sampling
1800
x368
178E3
The Beaver's Problem - 2
2300
x197
178E2
The Beaver's Problem - 2
2000
x225
178E1
The Beaver's Problem - 2
1900
x285
178D3
Magic Squares
2100
x234
178D2
Magic Squares
1900
x256
178D1
Magic Squares
1500
x605
178C3
Smart Beaver and Resolving Collisions
2000
x294
178C2
Smart Beaver and Resolving Collisions
1900
x280
178C1
Smart Beaver and Resolving Collisions
1600
x458
178B3
Greedy Merchants
1800
x1100
178B2
Greedy Merchants
1600
x636
178B1
Greedy Merchants
1600
x718
178A3
Educational Game
greedy
1100
x1377
178A2
Educational Game
greedy
1000
x1549
178A1
Educational Game
1000
x1536
177G2
Fibonacci Strings
matrices
,
strings
2600
x166
177G1
Fibonacci Strings
strings
2400
x160
177F2
Script Generation
2300
x190
177F1
Script Generation
1800
x288
177E2
Space Voyage
binary search
1900
x391
177E1
Space Voyage
binary search
1700
x570
177D2
Encrypting Messages
data structures
1500
x1749
177D1
Encrypting Messages
brute force
1200
x2016
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2399
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2407
177B2
Rectangular Game
number theory
1200
x2810
177B1
Rectangular Game
number theory
1000
x3954
177A2
Good Matrix Elements
implementation
800
x7005
177A1
Good Matrix Elements
implementation
800
x8094
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1007
176D
Hyper String
dp
2500
x295
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x459
176B
Word Cut
dp
1700
x1687
176A
Trading Business
greedy
,
sortings
1200
x1396
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x62
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x259
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x288
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1267
175B
Plane of Tanks: Pro
implementation
1400
x1355
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2331
174C
Range Increments
data structures
,
greedy
1800
x1061
174B
File List
dp
,
greedy
,
implementation
1400
x2177
174A
Problem About Equation
math
1100
x2572
173E
Camping Groups
data structures
,
sortings
2600
x530
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x245
173C
Spiral Maximum
brute force
,
dp
1900
x948
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x2815
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2188
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x263
172D
Calendar Reform
*special problem
,
number theory
1500
x1375
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1126
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2666
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5835
171H
A polyline
*special problem
,
implementation
1700
x262
171G
Mysterious numbers - 2
*special problem
1600
x870
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1212
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1364
171D
Broken checker
*special problem
,
brute force
1300
x2455
171C
A Piece of Cake
*special problem
,
implementation
2000
x1020
171B
Star
*special problem
,
combinatorics
1300
x3819
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4190
169B
Replacing Digits
greedy
1100
x3163
169A
Chores
sortings
800
x6501
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1195
168A
Wizards and Demonstration
implementation
,
math
900
x10232
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