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Before contest
Codeforces Round (Div. 3)
4 days
→ Filter Problems
Difficulty:
—
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
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Status
Standings
Custom test
Problems
#
Name
394E
Lightbulb for Minister
geometry
x115
394D
Physical Education and Buns
brute force
,
implementation
,
math
x263
394C
Dominoes
constructive algorithms
,
greedy
x513
394B
Very Beautiful Number
math
x569
394A
Counting Sticks
brute force
,
implementation
x2638
393B
Three matrices
x1953
393A
Nineteen
x6543
392E
Deleting Substrings
x174
392D
Three Arrays
data structures
x211
392C
Yet Another Number Sequence
combinatorics
,
math
,
matrices
x583
392B
Tower of Hanoi
dp
x886
392A
Blocked Points
math
x967
391F3
Stock Trading
x106
391F2
Stock Trading
greedy
x105
391F1
Stock Trading
dp
x163
391E2
Three Trees
x151
391E1
Three Trees
x115
391D2
Supercollider
data structures
x190
391D1
Supercollider
brute force
x205
391C3
The Tournament
x165
391C2
The Tournament
greedy
x132
391C1
The Tournament
brute force
x183
391B
Word Folding
brute force
x383
391A
Genetic Engineering
implementation
,
two pointers
x1708
390E
Inna and Large Sweet Matrix
x257
390D
Inna and Sweet Matrix
constructive algorithms
x509
390C
Inna and Candy Boxes
data structures
x625
390B
Inna, Dima and Song
implementation
x1170
390A
Inna and Alarm Clock
implementation
x3480
389B
Fox and Cross
greedy
,
implementation
1100
x6841
389A
Fox and Number Game
greedy
,
math
1000
x13926
388E
Fox and Meteor Shower
geometry
3100
x120
388D
Fox and Perfect Sets
math
2700
x439
388C
Fox and Card Game
games
,
greedy
,
sortings
2000
x3144
388B
Fox and Minimal path
bitmasks
,
constructive algorithms
,
graphs
,
implementation
,
math
1900
x2445
388A
Fox and Box Accumulation
greedy
,
sortings
1400
x11400
387E
George and Cards
binary search
,
data structures
2200
x864
387D
George and Interesting Graph
graph matchings
2200
x967
387C
George and Number
greedy
,
implementation
1700
x2171
387B
George and Round
brute force
,
greedy
,
two pointers
1200
x11997
387A
George and Sleep
implementation
900
x9589
386D
Game with Points
dp
,
graphs
,
implementation
,
shortest paths
2100
x417
386C
Diverse Substrings
dp
,
strings
,
two pointers
2000
x756
386B
Fly, freebies, fly!
binary search
,
brute force
,
implementation
1400
x2129
386A
Second-Price Auction
implementation
800
x6070
385E
Bear in the Field
math
,
matrices
2300
x565
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x801
385C
Bear and Prime Numbers
binary search
,
brute force
,
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9484
385B
Bear and Strings
brute force
,
greedy
,
implementation
,
math
,
strings
1200
x9665
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x16309
384B
Multitasking
greedy
,
implementation
,
sortings
,
two pointers
1500
x3505
384A
Coder
implementation
800
x15993
383E
Vowels
combinatorics
,
divide and conquer
,
dp
2700
x2871
383D
Antimatter
dp
2300
x2926
383C
Propagating tree
data structures
,
dfs and similar
,
trees
2000
x6207
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x659
383A
Milking cows
data structures
,
greedy
1600
x5224
382E
Ksenia and Combinatorics
combinatorics
,
dp
2600
x370
382D
Ksenia and Pawns
dfs and similar
,
graphs
,
implementation
,
trees
2200
x657
382C
Arithmetic Progression
implementation
,
sortings
1700
x8207
382B
Number Busters
binary search
,
math
2000
x1393
382A
Ksenia and Pan Scales
greedy
,
implementation
1100
x11999
381B
Sereja and Stairs
greedy
,
implementation
,
sortings
1100
x6636
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x62451
380E
Sereja and Dividing
data structures
2600
x295
380D
Sereja and Cinema
combinatorics
,
math
2500
x414
380C
Sereja and Brackets
data structures
,
schedules
2000
x14165
380B
Sereja and Tree
graphs
,
implementation
2400
x531
380A
Sereja and Prefixes
binary search
,
brute force
1600
x2661
379G
New Year Cactus
dp
3100
x141
379F
New Year Tree
data structures
,
divide and conquer
,
trees
2400
x2174
379E
New Year Tree Decorations
geometry
,
schedules
,
sortings
2500
x338
379D
New Year Letter
bitmasks
,
brute force
,
dp
2000
x1489
379C
New Year Ratings Change
greedy
,
sortings
1400
x6510
379B
New Year Present
constructive algorithms
,
implementation
1200
x7215
379A
New Year Candles
implementation
1000
x45200
378B
Semifinals
implementation
,
sortings
1300
x5163
378A
Playing with Dice
brute force
800
x23377
377E
Cookie Clicker
dp
,
geometry
2800
x447
377D
Developing Game
data structures
2400
x1107
377C
Captains Mode
bitmasks
,
dp
,
games
2200
x1111
377B
Preparing for the Contest
binary search
,
data structures
,
greedy
,
sortings
1900
x1979
377A
Maze
dfs and similar
1600
x21774
376B
I.O.U.
implementation
1300
x6174
376A
Lever
implementation
,
math
900
x9165
375E
Red and Black Tree
dp
,
implementation
,
math
3000
x404
375D
Tree and Queries
data structures
,
dfs and similar
,
trees
2400
x6347
375C
Circling Round Treasures
bitmasks
,
shortest paths
2600
x474
375B
Maximum Submatrix 2
data structures
,
dp
,
implementation
,
sortings
1600
x4978
375A
Divisible by Seven
math
,
number theory
1600
x4707
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x179
374D
Inna and Sequence
binary search
,
data structures
,
dp
,
trees
2000
x852
374C
Inna and Dima
dfs and similar
,
dp
,
graphs
,
implementation
1900
x2676
374B
Inna and Nine
combinatorics
,
greedy
1500
x3249
374A
Inna and Pink Pony
greedy
,
implementation
2000
x2852
373B
Making Sequences is Fun
binary search
,
implementation
,
math
1600
x2452
373A
Collecting Beats is Fun
implementation
900
x10491
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x170
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x953
372C
Watching Fireworks is Fun
data structures
,
dp
,
math
2100
x3852
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