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Before contest
Codeforces Round 941 (Div. 1)
29:17:34
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Before contest
Codeforces Round 941 (Div. 2)
29:17:34
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→ Filter Problems
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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
883C
Downloading B++
binary search
,
implementation
2300
x614
883A
Automatic Door
implementation
2200
x573
879B
Table Tennis
data structures
,
implementation
1200
x11846
879A
Borya's Diagnosis
implementation
900
x8946
878B
Teams Formation
data structures
,
implementation
2300
x1027
877A
Alex and broken contest
implementation
,
strings
1100
x10686
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x8677
875C
National Property
2-sat
,
dfs and similar
,
graphs
,
implementation
2100
x1904
875B
Sorting the Coins
dsu
,
implementation
,
sortings
,
two pointers
1500
x5113
873B
Balanced Substring
dp
,
implementation
1500
x7393
873A
Chores
implementation
800
x7979
870A
Search for Pretty Integers
brute force
,
implementation
900
x9937
869A
The Artful Expedient
brute force
,
implementation
1100
x9350
868D
Huge Strings
bitmasks
,
brute force
,
dp
,
implementation
,
strings
2200
x890
868B
Race Against Time
implementation
1400
x3628
868A
Bark to Unlock
brute force
,
implementation
,
strings
900
x8508
867A
Between the Offices
implementation
800
x18721
864D
Make a Permutation!
greedy
,
implementation
,
math
1500
x5953
864C
Bus
greedy
,
implementation
,
math
1500
x5824
864B
Polycarp and Letters
brute force
,
implementation
,
strings
1000
x8868
864A
Fair Game
implementation
,
sortings
1000
x11514
863D
Yet Another Array Queries Problem
data structures
,
implementation
1800
x3135
863C
1-2-3
graphs
,
implementation
1800
x2402
863A
Quasi-palindrome
brute force
,
implementation
900
x9956
862A
Mahmoud and Ehab and the MEX
greedy
,
implementation
1000
x9348
859A
Declined Finalists
greedy
,
implementation
800
x7607
858E
Tests Renumeration
greedy
,
implementation
2200
x495
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3709
858C
Did you mean...
dp
,
greedy
,
implementation
1500
x5441
858B
Which floor?
brute force
,
implementation
1500
x3687
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x20045
852G
Bathroom terminal
implementation
1700
x1263
852A
Digits
brute force
,
implementation
,
math
2500
x364
851A
Arpa and a research in Mexican wave
implementation
,
math
800
x9493
850B
Arpa and a list of numbers
implementation
,
number theory
2100
x1973
849A
Odds and Ends
implementation
1000
x8906
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1813
847M
Weather Tomorrow
implementation
,
math
1000
x6172
847K
Travel Cards
greedy
,
implementation
,
sortings
1800
x1482
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1500
847G
University Classes
implementation
900
x6503
847A
Union of Doubly Linked Lists
implementation
1500
x3289
846A
Curriculum Vitae
brute force
,
implementation
1500
x4150
845B
Luba And The Ticket
brute force
,
greedy
,
implementation
1600
x4930
845A
Chess Tourney
implementation
,
sortings
1100
x7626
844A
Diversity
greedy
,
implementation
,
strings
1000
x10354
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5522
841A
Generous Kefa
brute force
,
implementation
900
x12914
839B
Game of the Rows
brute force
,
greedy
,
implementation
1900
x3257
839A
Arya and Bran
implementation
900
x13927
837E
Vasya's Function
binary search
,
implementation
,
math
2100
x1506
837C
Two Seals
brute force
,
implementation
1500
x3918
837B
Flag of Berland
brute force
,
implementation
1600
x3883
837A
Text Volume
implementation
800
x9240
835C
Star sky
dp
,
implementation
1600
x7626
834B
The Festive Evening
data structures
,
implementation
1100
x8506
834A
The Useless Toy
implementation
900
x8487
833D
Red-Black Cobweb
data structures
,
divide and conquer
,
implementation
,
trees
2800
x371
832C
Strange Radiation
binary search
,
implementation
,
math
2500
x427
832B
Petya and Exam
implementation
,
strings
1600
x4326
831B
Keyboard Layouts
implementation
,
strings
800
x14049
831A
Unimodal Array
implementation
1000
x10021
830E
Perpetual Motion Machine
constructive algorithms
,
dp
,
graphs
,
implementation
,
math
,
trees
3100
x272
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1181
830B
Cards Sorting
data structures
,
implementation
,
sortings
1600
x2787
828B
Black Square
implementation
1300
x5650
828A
Restaurant Tables
implementation
1200
x7787
827B
High Load
constructive algorithms
,
greedy
,
implementation
,
trees
1800
x3435
825D
Suitable Replacement
binary search
,
greedy
,
implementation
1500
x3173
825C
Multi-judge Solving
greedy
,
implementation
1600
x4349
825B
Five-In-a-Row
brute force
,
implementation
1600
x4049
825A
Binary Protocol
implementation
1100
x7525
822C
Hacker, pack your bags!
binary search
,
greedy
,
implementation
,
sortings
1600
x4523
822B
Crossword solving
brute force
,
implementation
,
strings
1000
x9314
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31606
821A
Okabe and Future Gadget Laboratory
implementation
800
x7936
820A
Mister B and Book Reading
implementation
900
x8020
819B
Mister B and PR Shifts
data structures
,
implementation
,
math
1900
x1620
818D
Multicolored Cars
data structures
,
implementation
1700
x3381
818C
Sofa Thief
brute force
,
implementation
2000
x1212
818B
Permutation Game
implementation
1600
x2956
818A
Diplomas and Certificates
implementation
,
math
800
x6772
817B
Makes And The Product
combinatorics
,
implementation
,
math
,
sortings
1500
x5539
817A
Treasure Hunt
implementation
,
math
,
number theory
1200
x6051
816B
Karen and Coffee
binary search
,
data structures
,
implementation
1400
x16350
816A
Karen and Morning
brute force
,
implementation
1000
x8883
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x218
815A
Karen and Game
brute force
,
greedy
,
implementation
1700
x5571
814A
An abandoned sentiment from past
constructive algorithms
,
greedy
,
implementation
,
sortings
900
x10238
813A
The Contest
implementation
1100
x5007
812D
Sagheer and Kindergarten
dfs and similar
,
graphs
,
implementation
,
trees
2700
x326
812A
Sagheer and Crossroads
implementation
1200
x6160
811C
Vladik and Memorable Trip
dp
,
implementation
1900
x3202
811B
Vladik and Complicated Book
implementation
,
sortings
1200
x6436
811A
Vladik and Courtesy
brute force
,
implementation
800
x11686
810A
Straight <<A>>
implementation
,
math
900
x8700
809A
Do you want a date?
implementation
,
math
,
sortings
1500
x4649
808D
Array Division
binary search
,
data structures
,
implementation
1900
x6716
808B
Average Sleep Time
data structures
,
implementation
,
math
1300
x6580
808A
Lucky Year
implementation
900
x9050
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