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Before contest
Codeforces Round (Div. 3)
6 days
→ Filter Problems
Difficulty:
—
implementation
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
611C
New Year and Domino
dp
,
implementation
1500
x8357
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x9845
611A
New Year and Days
implementation
900
x11578
610B
Vika and Squares
constructive algorithms
,
implementation
1300
x7103
609C
Load Balancing
implementation
,
math
1500
x6373
609B
The Best Gift
constructive algorithms
,
implementation
1100
x8870
609A
USB Flash Drives
greedy
,
implementation
,
sortings
800
x16883
608A
Saitama Destroys Hotel
implementation
,
math
1000
x9177
606B
Testing Robots
implementation
1600
x2733
606A
Magic Spheres
implementation
1200
x7753
604A
Uncowed Forces
implementation
1000
x8881
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10508
602A
Two Bases
brute force
,
implementation
1100
x8381
600A
Extract Numbers
implementation
,
strings
1600
x4963
599B
Spongebob and Joke
implementation
1500
x4343
599A
Patrick and Shopping
implementation
800
x28030
598B
Queries on a String
implementation
,
strings
1300
x10663
596B
Wilbur and Array
greedy
,
implementation
1100
x10224
596A
Wilbur and Swimming Pool
geometry
,
implementation
1100
x7638
595A
Vitaly and Night
constructive algorithms
,
implementation
800
x14398
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x675
593A
2Char
brute force
,
implementation
1200
x5688
592A
PawnChess
implementation
1200
x6311
591B
Rebranding
implementation
,
strings
1200
x8151
591A
Wizards' Duel
implementation
,
math
900
x13955
590A
Median Smoothing
implementation
1700
x3896
586B
Laurenty and Shop
implementation
1300
x5126
586A
Alena's Schedule
implementation
900
x9922
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x640
585A
Gennady the Dentist
brute force
,
implementation
1800
x4167
583B
Robot's Task
greedy
,
implementation
1200
x8640
583A
Asphalting Roads
implementation
1000
x11270
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3482
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7267
581B
Luxurious Houses
implementation
,
math
1100
x12933
581A
Vasya the Hipster
implementation
,
math
800
x68091
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x84987
579B
Finding Team Member
brute force
,
implementation
,
sortings
1300
x5230
577A
Multiplication Table
implementation
,
number theory
1000
x38552
575D
Tablecity
constructive algorithms
,
implementation
1700
x1809
574A
Bear and Elections
greedy
,
implementation
1200
x9004
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16352
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x6775
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2068
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x8995
570B
Simple Game
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1300
x15820
570A
Elections
implementation
1100
x13768
569A
Music
implementation
,
math
1500
x4752
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5011
567B
Berland National Library
implementation
1300
x8354
567A
Lineland Mail
greedy
,
implementation
900
x30914
560B
Gerald is into Art
constructive algorithms
,
implementation
1200
x7851
560A
Currency System in Geraldion
implementation
,
sortings
1000
x16876
558D
Guess Your Way Out! II
data structures
,
implementation
,
sortings
2300
x1111
558B
Amr and The Large Array
implementation
1300
x7776
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10212
557B
Pasha and Tea
constructive algorithms
,
implementation
,
math
,
sortings
1500
x7094
557A
Ilya and Diplomas
greedy
,
implementation
,
math
1100
x8211
556B
Case of Fake Numbers
brute force
,
implementation
1100
x7891
555D
Case of a Top Secret
binary search
,
implementation
,
math
2500
x858
555A
Case of Matryoshkas
implementation
1500
x6502
553B
Kyoya and Permutation
binary search
,
combinatorics
,
constructive algorithms
,
greedy
,
implementation
,
math
1900
x2099
552E
Vanya and Brackets
brute force
,
dp
,
expression parsing
,
greedy
,
implementation
,
strings
2100
x1465
552B
Vanya and Books
implementation
,
math
1200
x15261
552A
Vanya and Table
implementation
,
math
1000
x9421
551E
GukiZ and GukiZiana
binary search
,
data structures
,
implementation
2500
x1660
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1809
551B
ZgukistringZ
brute force
,
constructive algorithms
,
implementation
,
strings
1800
x3766
551A
GukiZ and Contest
brute force
,
implementation
,
sortings
800
x16063
550E
Brackets in Implications
constructive algorithms
,
greedy
,
implementation
,
math
2200
x1380
550D
Regular Bridge
constructive algorithms
,
graphs
,
implementation
1900
x3259
550A
Two Substrings
brute force
,
dp
,
greedy
,
implementation
,
strings
1500
x36685
549D
Haar Features
greedy
,
implementation
1900
x2129
549A
Face Detection
implementation
,
strings
900
x9370
548B
Mike and Fun
brute force
,
dp
,
greedy
,
implementation
1400
x8309
548A
Mike and Fax
brute force
,
implementation
,
strings
1100
x9862
547A
Mike and Frog
brute force
,
greedy
,
implementation
,
math
2200
x2320
546B
Soldier and Badges
brute force
,
greedy
,
implementation
,
sortings
1200
x17325
546A
Soldier and Bananas
brute force
,
implementation
,
math
800
x170774
545D
Queue
greedy
,
implementation
,
sortings
1300
x24280
545A
Toy Cars
implementation
900
x11462
544B
Sea and Islands
constructive algorithms
,
implementation
1400
x7856
544A
Set of Strings
implementation
,
strings
1100
x7849
540E
Infinite Inversions
binary search
,
data structures
,
implementation
,
sortings
,
trees
2100
x2020
540B
School Marks
greedy
,
implementation
1700
x4613
540A
Combination Lock
implementation
800
x31798
538D
Weird Chess
brute force
,
constructive algorithms
,
implementation
1800
x2407
538C
Tourist's Notes
binary search
,
brute force
,
greedy
,
implementation
,
math
1600
x5769
538B
Quasi Binary
constructive algorithms
,
dp
,
greedy
,
implementation
1400
x17697
538A
Cutting Banner
brute force
,
implementation
1400
x7084
535B
Tavas and SaDDas
bitmasks
,
brute force
,
combinatorics
,
implementation
1100
x21852
535A
Tavas and Nafas
brute force
,
implementation
1000
x11947
534E
Berland Local Positioning System
constructive algorithms
,
greedy
,
hashing
,
implementation
2400
x344
534A
Exam
constructive algorithms
,
implementation
,
math
1100
x12103
533C
Board Game
games
,
greedy
,
implementation
,
math
1700
x2166
527D
Clique Problem
data structures
,
dp
,
greedy
,
implementation
,
sortings
1800
x4667
527C
Glass Carving
binary search
,
data structures
,
implementation
1500
x6695
527A
Playing with Paper
implementation
,
math
1100
x14206
526E
Transmitting Levels
dp
,
implementation
2400
x1060
526B
Om Nom and Dark Park
dfs and similar
,
greedy
,
implementation
1400
x4474
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