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Before contest
Codeforces Round (Div. 1)
5 days
Before contest
Codeforces Round (Div. 2)
5 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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Custom test
Problems
#
Name
641D
Little Artem and Random Variable
dp
,
implementation
,
math
,
probabilities
2400
x1234
641C
Little Artem and Dance
brute force
,
constructive algorithms
,
implementation
1800
x3034
641B
Little Artem and Matrix
implementation
1400
x3977
641A
Little Artem and Grasshopper
implementation
1000
x5887
639C
Bear and Polynomials
hashing
,
implementation
,
math
2200
x1194
639A
Bear and Displayed Friends
implementation
1200
x6133
637C
Promocodes with Mistakes
*special problem
,
brute force
,
constructive algorithms
,
implementation
1400
x2417
637A
Voting for Photos
*special problem
,
constructive algorithms
,
implementation
1000
x5369
635A
Orchestra
brute force
,
implementation
1100
x2878
634A
Island Puzzle
constructive algorithms
,
implementation
1300
x3299
633H
Fibonacci-ish II
data structures
,
implementation
3100
x590
633D
Fibonacci-ish
brute force
,
dp
,
hashing
,
implementation
,
math
2000
x2775
633C
Spy Syndrome 2
data structures
,
dp
,
hashing
,
implementation
,
sortings
,
string suffix structures
,
strings
1900
x2734
631D
Messenger
data structures
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2065
631B
Print Check
constructive algorithms
,
implementation
1200
x7323
631A
Interview
brute force
,
implementation
900
x9231
630L
Cracking the Code
implementation
,
math
1400
x3544
629A
Far Relative’s Birthday Cake
brute force
,
combinatorics
,
constructive algorithms
,
implementation
800
x13320
628E
Zbazi in Zeydabad
data structures
,
implementation
2300
x878
628A
Tennis Tournament
implementation
,
math
1000
x6279
626A
Robot Sequence
brute force
,
implementation
1000
x6183
625D
Finals in arithmetic
constructive algorithms
,
implementation
,
math
2400
x628
625C
K-special Tables
constructive algorithms
,
implementation
1300
x6798
625A
Guest From the Past
implementation
,
math
1700
x5377
622C
Not Equal on a Segment
data structures
,
implementation
1700
x6388
622B
The Time
implementation
900
x9272
622A
Infinite Sequence
implementation
,
math
1000
x9221
621B
Wet Shark and Bishops
combinatorics
,
implementation
1300
x10925
621A
Wet Shark and Odd and Even
implementation
900
x20108
620B
Grandfather Dovlet’s calculator
implementation
1000
x9356
620A
Professor GukiZ's Robot
implementation
,
math
800
x13035
618C
Constellation
geometry
,
implementation
1600
x4217
618A
Slime Combining
implementation
800
x8317
617D
Polyline
constructive algorithms
,
implementation
1700
x4189
617C
Watering Flowers
implementation
1600
x4844
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x2841
616A
Comparing Two Long Integers
implementation
,
strings
900
x9740
615E
Hexagons
binary search
,
implementation
,
math
2100
x972
615A
Bulbs
implementation
800
x17107
614B
Gena's Code
implementation
,
math
1400
x6866
614A
Link/Cut Tree
brute force
,
implementation
1500
x7438
612B
HDD is Outdated Technology
implementation
,
math
1200
x6935
612A
The Text Splitting
brute force
,
implementation
,
strings
1300
x7151
611F
New Year and Cleaning
binary search
,
implementation
2500
x473
611C
New Year and Domino
dp
,
implementation
1500
x8428
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x10008
611A
New Year and Days
implementation
900
x11623
610B
Vika and Squares
constructive algorithms
,
implementation
1300
x7210
609C
Load Balancing
implementation
,
math
1500
x6510
609B
The Best Gift
constructive algorithms
,
implementation
1100
x8965
609A
USB Flash Drives
greedy
,
implementation
,
sortings
800
x17098
608A
Saitama Destroys Hotel
implementation
,
math
1000
x9284
606B
Testing Robots
implementation
1600
x2739
606A
Magic Spheres
implementation
1200
x7952
604A
Uncowed Forces
implementation
1000
x8936
602B
Approximating a Constant Range
dp
,
implementation
,
two pointers
1400
x10707
602A
Two Bases
brute force
,
implementation
1100
x8434
600A
Extract Numbers
implementation
,
strings
1600
x5176
599B
Spongebob and Joke
implementation
1500
x4358
599A
Patrick and Shopping
implementation
800
x28422
598B
Queries on a String
implementation
,
strings
1300
x10824
596B
Wilbur and Array
greedy
,
implementation
1100
x10296
596A
Wilbur and Swimming Pool
geometry
,
implementation
1100
x7687
595A
Vitaly and Night
constructive algorithms
,
implementation
800
x14480
594C
Edo and Magnets
brute force
,
greedy
,
implementation
,
two pointers
2300
x682
593A
2Char
brute force
,
implementation
1200
x5716
592A
PawnChess
implementation
1200
x6329
591B
Rebranding
implementation
,
strings
1200
x8201
591A
Wizards' Duel
implementation
,
math
900
x14122
590A
Median Smoothing
implementation
1700
x3915
586B
Laurenty and Shop
implementation
1300
x5138
586A
Alena's Schedule
implementation
900
x9972
585F
Digits of Number Pi
dp
,
implementation
,
strings
3200
x668
585A
Gennady the Dentist
brute force
,
implementation
1800
x4314
583B
Robot's Task
greedy
,
implementation
1200
x8702
583A
Asphalting Roads
implementation
1000
x11348
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3592
581C
Developing Skills
implementation
,
math
,
sortings
1400
x7293
581B
Luxurious Houses
implementation
,
math
1100
x13006
581A
Vasya the Hipster
implementation
,
math
800
x69741
580A
Kefa and First Steps
brute force
,
dp
,
implementation
900
x86935
579B
Finding Team Member
brute force
,
implementation
,
sortings
1300
x5243
577A
Multiplication Table
implementation
,
number theory
1000
x39290
575D
Tablecity
constructive algorithms
,
implementation
1700
x1819
574A
Bear and Elections
greedy
,
implementation
1200
x9050
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16460
572B
Order Book
data structures
,
greedy
,
implementation
,
sortings
1300
x6844
571A
Lengthening Sticks
combinatorics
,
implementation
,
math
2100
x2303
570C
Replacement
constructive algorithms
,
data structures
,
implementation
1600
x9098
570B
Simple Game
constructive algorithms
,
games
,
greedy
,
implementation
,
math
1300
x16045
570A
Elections
implementation
1100
x13834
569A
Music
implementation
,
math
1500
x4785
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5033
567B
Berland National Library
implementation
1300
x8387
567A
Lineland Mail
greedy
,
implementation
900
x31697
560B
Gerald is into Art
constructive algorithms
,
implementation
1200
x7884
560A
Currency System in Geraldion
implementation
,
sortings
1000
x16984
558D
Guess Your Way Out! II
data structures
,
implementation
,
sortings
2300
x1120
558B
Amr and The Large Array
implementation
1300
x7812
558A
Lala Land and Apple Trees
brute force
,
implementation
,
sortings
1100
x10291
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