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Before contest
Codeforces Round (Div. 3)
7 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
385A
Bear and Raspberry
brute force
,
greedy
,
implementation
1000
x16280
384A
Coder
implementation
800
x15940
381A
Sereja and Dima
greedy
,
implementation
,
two pointers
800
x61502
379A
New Year Candles
implementation
1000
x44915
378A
Playing with Dice
brute force
800
x23251
376A
Lever
implementation
,
math
900
x9063
373A
Collecting Beats is Fun
implementation
900
x10429
371A
K-Periodic Array
greedy
,
implementation
,
math
1000
x5966
369A
Valera and Plates
greedy
,
implementation
900
x10842
368A
Sereja and Coat Rack
implementation
1000
x7400
363A
Soroban
implementation
800
x10540
361A
Levko and Table
constructive algorithms
,
implementation
800
x16323
359A
Table
constructive algorithms
,
greedy
,
implementation
1000
x8417
357A
Group of Students
brute force
,
greedy
,
implementation
1000
x6734
352A
Jeff and Digits
brute force
,
implementation
,
math
1000
x24851
344A
Magnets
implementation
800
x113645
339B
Xenia and Ringroad
implementation
1000
x67282
339A
Helpful Maths
greedy
,
implementation
,
sortings
,
strings
800
x201803
337A
Puzzles
greedy
900
x76444
336A
Vasily the Bear and Triangle
implementation
,
math
1000
x9919
334A
Candy Bags
implementation
1000
x18161
330A
Cakeminator
brute force
,
implementation
800
x27642
322A
Ciel and Dancing
greedy
1000
x8110
320A
Magic Numbers
brute force
,
greedy
900
x34212
318A
Even Odds
math
900
x107933
313A
Ilya and Bank Account
implementation
,
number theory
900
x54201
306A
Candies
implementation
800
x6623
302A
Eugeny and Array
implementation
800
x8956
299B
Ksusha the Squirrel
brute force
,
implementation
900
x5173
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x7799
294A
Shaass and Oskols
implementation
,
math
800
x22466
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x6010
284B
Cows and Poker Game
brute force
,
implementation
1000
x6691
282A
Bit++
implementation
800
x241846
281A
Word Capitalization
implementation
,
strings
800
x199495
278A
Circle Line
implementation
800
x11492
276A
Lunch Rush
implementation
900
x26920
275A
Lights Out
implementation
900
x28964
272A
Dima and Friends
implementation
,
math
1000
x23787
271A
Beautiful Year
brute force
800
x129850
268B
Buttons
implementation
,
math
1000
x31261
268A
Games
brute force
800
x82196
267A
Subtractions
math
,
number theory
900
x7238
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x128686
266A
Stones on the Table
implementation
800
x180714
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x16971
265A
Colorful Stones (Simplified Edition)
implementation
800
x34866
263B
Squares
greedy
,
implementation
,
sortings
900
x8757
263A
Beautiful Matrix
implementation
800
x229272
262A
Roma and Lucky Numbers
implementation
800
x19343
259A
Little Elephant and Chess
brute force
,
strings
1000
x8973
255A
Greg's Workout
implementation
800
x27869
250A
Paper Work
greedy
1000
x4010
248A
Cupboards
implementation
800
x21605
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9098
245A
System Administrator
implementation
800
x8307
244A
Dividing Orange
implementation
900
x7776
237A
Free Cash
implementation
1000
x26034
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x196971
234B
Reading
sortings
1000
x7020
233A
Perfect Permutation
implementation
,
math
800
x40933
231A
Team
brute force
,
greedy
800
x304765
230A
Dragons
greedy
,
sortings
1000
x75451
228A
Is your horseshoe on the other hoof?
implementation
800
x103761
221A
Little Elephant and Function
implementation
,
math
1000
x14815
219A
k-String
implementation
,
strings
1000
x26460
215A
Bicycle Chain
brute force
,
implementation
900
x14050
214A
System of Equations
brute force
800
x34036
208A
Dubstep
strings
900
x84813
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x21748
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x16030
200B
Drinks
implementation
,
math
800
x109643
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25454
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x8527
194A
Exams
implementation
,
math
900
x9687
182B
Vasya's Calendar
implementation
1000
x6821
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x6767
178A2
Educational Game
greedy
1000
x1584
178A1
Educational Game
1000
x1560
177B1
Rectangular Game
number theory
1000
x4008
177A2
Good Matrix Elements
implementation
800
x7102
177A1
Good Matrix Elements
implementation
800
x8300
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5943
169A
Chores
sortings
800
x6603
168A
Wizards and Demonstration
implementation
,
math
900
x10370
165A
Supercentral Point
implementation
1000
x22868
160A
Twins
greedy
,
sortings
900
x112406
158A
Next Round
*special problem
,
implementation
800
x236077
157B
Trace
geometry
,
sortings
1000
x12933
157A
Game Outcome
brute force
800
x7448
155A
I_love_\%username\%
brute force
800
x71669
152A
Marks
implementation
900
x16324
151A
Soft Drinking
implementation
,
math
800
x67442
149A
Business trip
greedy
,
implementation
,
sortings
900
x38231
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x88393
146A
Lucky Ticket
implementation
800
x14737
144A
Arrival of the General
implementation
800
x90571
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13221
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x79039
139A
Petr and Book
implementation
1000
x29328
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