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Before contest
Codeforces Round 941 (Div. 1)
20:51:07
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Before contest
Codeforces Round 941 (Div. 2)
20:51:08
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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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Problems
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Custom test
Problems
#
Name
691A
Fashion in Berland
implementation
1000
x9873
435A
Queue on Bus Stop
implementation
1000
x9962
831A
Unimodal Array
implementation
1000
x10022
1100A
Roman and Browser
implementation
1000
x10026
777A
Shell Game
constructive algorithms
,
implementation
,
math
1000
x10032
465B
Inbox (100500)
implementation
1000
x10207
939B
Hamster Farm
implementation
1000
x10210
991A
If at first you don't succeed...
implementation
1000
x10343
844A
Diversity
greedy
,
implementation
,
strings
1000
x10354
1073B
Vasya and Books
implementation
,
math
1000
x10401
990A
Commentary Boxes
implementation
,
math
1000
x10435
887A
Div. 64
implementation
1000
x10926
893B
Beautiful Divisors
brute force
,
implementation
1000
x10928
670B
Game of Robots
implementation
1000
x10954
757A
Gotta Catch Em' All!
implementation
1000
x11076
1215A
Yellow Cards
greedy
,
implementation
,
math
1000
x11246
583A
Asphalting Roads
implementation
1000
x11252
864A
Fair Game
implementation
,
sortings
1000
x11514
1225B1
TV Subscriptions (Easy Version)
implementation
1000
x11590
535A
Tavas and Nafas
brute force
,
implementation
1000
x11811
122B
Lucky Substring
brute force
,
implementation
1000
x11985
1140A
Detective Book
implementation
1000
x12059
1088B
Ehab and subtraction
implementation
,
sortings
1000
x12342
1059A
Cashier
implementation
1000
x12420
1802B
Settlement of Guinea Pigs
greedy
,
implementation
,
math
1000
x12875
1033A
King Escape
dfs and similar
,
graphs
,
implementation
1000
x12909
1277A
Happy Birthday, Polycarp!
implementation
1000
x12941
1761B
Elimination of a Ring
constructive algorithms
,
greedy
,
implementation
1000
x12983
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x13417
1197B
Pillars
greedy
,
implementation
1000
x13488
499A
Watching a movie
greedy
,
implementation
1000
x13700
1804B
Vaccination
greedy
,
implementation
1000
x13749
1199A
City Day
implementation
1000
x13973
761A
Dasha and Stairs
brute force
,
constructive algorithms
,
implementation
,
math
1000
x14326
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14384
221A
Little Elephant and Function
implementation
,
math
1000
x14637
1073A
Diverse Substring
implementation
,
strings
1000
x14848
1244B
Rooms and Staircases
brute force
,
implementation
1000
x15094
699A
Launch of Collider
implementation
1000
x15139
659A
Round House
implementation
,
math
1000
x15343
1027A
Palindromic Twist
implementation
,
strings
1000
x15518
1139B
Chocolates
greedy
,
implementation
1000
x15614
1278A
Shuffle Hashing
brute force
,
implementation
,
strings
1000
x15680
1598B
Groups
brute force
,
implementation
1000
x15773
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15846
733A
Grasshopper And the String
implementation
1000
x15880
1796B
Asterisk-Minor Template
implementation
,
strings
1000
x15988
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x16206
1704B
Luke is a Foodie
brute force
,
greedy
,
implementation
1000
x16267
1203A
Circle of Students
implementation
1000
x16365
1133A
Middle of the Contest
implementation
1000
x16378
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x16521
462A
Appleman and Easy Task
brute force
,
implementation
1000
x16535
1111A
Superhero Transformation
implementation
,
strings
1000
x16560
560A
Currency System in Geraldion
implementation
,
sortings
1000
x16808
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x16867
1659A
Red Versus Blue
constructive algorithms
,
greedy
,
implementation
,
math
1000
x16875
507A
Amr and Music
greedy
,
implementation
,
sortings
1000
x16958
672B
Different is Good
constructive algorithms
,
implementation
,
strings
1000
x17040
1253A
Single Push
implementation
1000
x17638
334A
Candy Bags
implementation
1000
x18011
441A
Valera and Antique Items
implementation
1000
x18182
1230B
Ania and Minimizing
greedy
,
implementation
1000
x18284
1234B1
Social Network (easy version)
implementation
1000
x18307
1237A
Balanced Rating Changes
implementation
,
math
1000
x18518
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19150
1811B
Conveyor Belts
implementation
,
math
1000
x19681
447B
DZY Loves Strings
greedy
,
implementation
1000
x19920
1766B
Notepad#
implementation
1000
x20044
1499B
Binary Removals
brute force
,
dp
,
greedy
,
implementation
1000
x20221
1841B
Keep it Beautiful
implementation
1000
x20444
1405B
Array Cancellation
constructive algorithms
,
implementation
1000
x20942
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21134
1691B
Shoe Shuffling
constructive algorithms
,
greedy
,
implementation
,
two pointers
1000
x21160
1721B
Deadly Laser
implementation
1000
x21511
1300B
Assigning to Classes
greedy
,
implementation
,
sortings
1000
x22182
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x22254
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22266
1362A
Johnny and Ancient Computer
implementation
1000
x22415
165A
Supercentral Point
implementation
1000
x22532
404A
Valera and X
implementation
1000
x22804
1674C
Infinite Replacement
combinatorics
,
implementation
,
strings
1000
x22850
1790C
Premutation
brute force
,
implementation
,
math
1000
x22867
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x23031
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x23273
1506C
Double-ended Strings
brute force
,
implementation
,
strings
1000
x23281
680B
Bear and Finding Criminals
constructive algorithms
,
implementation
1000
x23325
272A
Dima and Friends
implementation
,
math
1000
x23445
1676D
X-Sum
brute force
,
greedy
,
implementation
1000
x23901
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24052
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24052
978C
Letters
binary search
,
implementation
,
two pointers
1000
x24293
102B
Sum of Digits
implementation
1000
x24495
352A
Jeff and Digits
brute force
,
implementation
,
math
1000
x24568
75A
Life Without Zeros
implementation
1000
x24922
237A
Free Cash
implementation
1000
x25730
1373A
Donut Shops
greedy
,
implementation
,
math
1000
x25754
219A
k-String
implementation
,
strings
1000
x25922
1690D
Black and White Stripe
implementation
,
two pointers
1000
x26628
1359B
New Theatre Square
brute force
,
dp
,
greedy
,
implementation
,
two pointers
1000
x27034
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