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Before contest
Codeforces Round 987 (Div. 2)
19:42:24
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Difficulty:
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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
313A
Ilya and Bank Account
implementation
,
number theory
900
x56746
306A
Candies
implementation
800
x7045
302A
Eugeny and Array
implementation
800
x9098
299B
Ksusha the Squirrel
brute force
,
implementation
900
x5347
299A
Ksusha and Array
brute force
,
number theory
,
sortings
1000
x8119
294A
Shaass and Oskols
implementation
,
math
800
x23778
291A
Spyke Talks
*special problem
,
implementation
,
sortings
800
x6102
284B
Cows and Poker Game
brute force
,
implementation
1000
x6857
282A
Bit++
implementation
800
x266888
281A
Word Capitalization
implementation
,
strings
800
x214581
278A
Circle Line
implementation
800
x11690
276A
Lunch Rush
implementation
900
x27781
275A
Lights Out
implementation
900
x30413
272A
Dima and Friends
implementation
,
math
1000
x24748
271A
Beautiful Year
brute force
800
x140151
268B
Buttons
implementation
,
math
1000
x32615
268A
Games
brute force
800
x87305
267A
Subtractions
math
,
number theory
900
x7557
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x136621
266A
Stones on the Table
implementation
800
x193520
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x17260
265A
Colorful Stones (Simplified Edition)
implementation
800
x37033
263B
Squares
greedy
,
implementation
,
sortings
900
x8935
263A
Beautiful Matrix
implementation
800
x247989
262A
Roma and Lucky Numbers
implementation
800
x20047
259A
Little Elephant and Chess
brute force
,
strings
1000
x9185
255A
Greg's Workout
implementation
800
x28800
250A
Paper Work
greedy
1000
x4138
248A
Cupboards
implementation
800
x22523
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9289
245A
System Administrator
implementation
800
x8480
244A
Dividing Orange
implementation
900
x7962
237A
Free Cash
implementation
1000
x26931
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x213929
234B
Reading
sortings
1000
x7129
233A
Perfect Permutation
implementation
,
math
800
x42862
231A
Team
brute force
,
greedy
800
x331225
230A
Dragons
greedy
,
sortings
1000
x80060
228A
Is your horseshoe on the other hoof?
implementation
800
x111579
221A
Little Elephant and Function
implementation
,
math
1000
x15297
219A
k-String
implementation
,
strings
1000
x28038
215A
Bicycle Chain
brute force
,
implementation
900
x14586
214A
System of Equations
brute force
800
x35731
208A
Dubstep
strings
900
x89164
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x22523
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x16998
200B
Drinks
implementation
,
math
800
x117789
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x26715
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x9072
194A
Exams
implementation
,
math
900
x9902
182B
Vasya's Calendar
implementation
1000
x6945
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x7148
178A2
Educational Game
greedy
1000
x1636
178A1
Educational Game
1000
x1617
177B1
Rectangular Game
number theory
1000
x4186
177A2
Good Matrix Elements
implementation
800
x7368
177A1
Good Matrix Elements
implementation
800
x8728
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6156
169A
Chores
sortings
800
x6973
168A
Wizards and Demonstration
implementation
,
math
900
x10611
165A
Supercentral Point
implementation
1000
x23669
160A
Twins
greedy
,
sortings
900
x119085
158A
Next Round
*special problem
,
implementation
800
x252801
157B
Trace
geometry
,
sortings
1000
x13243
157A
Game Outcome
brute force
800
x7618
155A
I_love_\%username\%
brute force
800
x76420
152A
Marks
implementation
900
x16863
151A
Soft Drinking
implementation
,
math
800
x74452
149A
Business trip
greedy
,
implementation
,
sortings
900
x40075
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x93683
146A
Lucky Ticket
implementation
800
x15160
144A
Arrival of the General
implementation
800
x97177
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13928
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x84025
139A
Petr and Book
implementation
1000
x31485
137B
Permutation
greedy
1000
x13752
137A
Postcards and photos
implementation
900
x7211
136A
Presents
implementation
800
x119082
133A
HQ9+
implementation
900
x106395
131A
cAPS lOCK
implementation
,
strings
1000
x86379
130A
Hexagonal numbers
*special problem
,
implementation
900
x1630
129A
Cookies
implementation
900
x22845
127B
Canvas Frames
implementation
1000
x8878
127A
Wasted Time
geometry
900
x11291
125B
Simple XML
implementation
1000
x2945
124A
The number of positions
math
1000
x38710
122B
Lucky Substring
brute force
,
implementation
1000
x12372
122A
Lucky Division
brute force
,
number theory
1000
x124951
120A
Elevator
brute force
,
implementation
,
math
1000
x4838
119A
Epic Game
implementation
800
x27502
118B
Present from Lena
constructive algorithms
,
implementation
1000
x30194
118A
String Task
implementation
,
strings
1000
x194643
116A
Tram
implementation
800
x143879
115A
Party
dfs and similar
,
graphs
,
trees
900
x34905
114A
Cifera
math
1000
x14188
112A
Petya and Strings
implementation
,
strings
800
x228142
110A
Nearly Lucky Number
implementation
800
x157439
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x17739
108A
Palindromic Times
implementation
,
strings
1000
x9394
106B
Choosing Laptop
brute force
,
implementation
1000
x6119
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