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Codeforces Round 950 (Div. 3)
47:40:32
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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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Custom test
Problems
#
Name
284B
Cows and Poker Game
brute force
,
implementation
1000
x6682
282A
Bit++
implementation
800
x239564
281A
Word Capitalization
implementation
,
strings
800
x198161
278A
Circle Line
implementation
800
x11481
276B
Little Girl and Game
games
,
greedy
1300
x27412
276A
Lunch Rush
implementation
900
x26835
275A
Lights Out
implementation
900
x28808
272A
Dima and Friends
implementation
,
math
1000
x23675
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12495
271A
Beautiful Year
brute force
800
x128998
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x43696
268B
Buttons
implementation
,
math
1000
x31081
268A
Games
brute force
800
x81676
267A
Subtractions
math
,
number theory
900
x7185
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x127891
266A
Stones on the Table
implementation
800
x179708
265B
Roadside Trees (Simplified Edition)
greedy
,
implementation
1000
x16930
265A
Colorful Stones (Simplified Edition)
implementation
800
x34717
264A
Escape from Stones
constructive algorithms
,
data structures
,
implementation
,
two pointers
1200
x10627
263B
Squares
greedy
,
implementation
,
sortings
900
x8740
263A
Beautiful Matrix
implementation
800
x227504
262B
Roma and Changing Signs
greedy
1200
x10969
262A
Roma and Lucky Numbers
implementation
800
x19292
259B
Little Elephant and Magic Square
brute force
,
implementation
1100
x13713
259A
Little Elephant and Chess
brute force
,
strings
1000
x8953
258A
Little Elephant and Bits
greedy
,
math
1100
x22175
257B
Playing Cubes
games
,
greedy
,
implementation
1300
x6883
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6394
255B
Code Parsing
implementation
1200
x4882
255A
Greg's Workout
implementation
800
x27799
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x6871
253A
Boys and Girls
greedy
1100
x10981
252A
Little Xor
brute force
,
implementation
1100
x5179
251A
Points on Line
binary search
,
combinatorics
,
two pointers
1300
x16843
250A
Paper Work
greedy
1000
x4002
248A
Cupboards
implementation
800
x21519
246B
Increase and Decrease
greedy
,
math
1300
x11017
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9073
245B
Internet Address
implementation
,
strings
1100
x5138
245A
System Administrator
implementation
800
x8297
244A
Dividing Orange
implementation
900
x7764
242B
Big Segment
implementation
,
sortings
1100
x15265
242A
Heads or Tails
brute force
,
implementation
1100
x6244
241A
Old Peykan
greedy
1300
x2205
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x18254
238A
Not Wool Sequences
constructive algorithms
,
math
1300
x2010
237A
Free Cash
implementation
1000
x25925
236B
Easy Number Challenge
implementation
,
number theory
1300
x13551
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x195532
234C
Weather
dp
,
implementation
1300
x5346
234B
Reading
sortings
1000
x6998
234A
Lefthanders and Righthanders
implementation
1200
x4382
233A
Perfect Permutation
implementation
,
math
800
x40734
231A
Team
brute force
,
greedy
800
x302591
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x70696
230A
Dragons
greedy
,
sortings
1000
x75011
228A
Is your horseshoe on the other hoof?
implementation
800
x103036
227B
Effective Approach
implementation
1100
x26657
227A
Where do I Turn?
geometry
1300
x4050
225A
Dice Tower
constructive algorithms
,
greedy
1100
x11158
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x25544
222B
Cosmic Tables
data structures
,
implementation
1300
x5990
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10418
221B
Little Elephant and Numbers
implementation
1300
x4512
221A
Little Elephant and Function
implementation
,
math
1000
x14766
220A
Little Elephant and Problem
implementation
,
sortings
1300
x11830
219A
k-String
implementation
,
strings
1000
x26240
218B
Airport
implementation
1100
x15836
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x8959
217A
Ice Skating
brute force
,
dfs and similar
,
dsu
,
graphs
1200
x20500
216A
Tiling with Hexagons
implementation
,
math
1200
x4929
215B
Olympic Medal
greedy
,
math
1300
x5386
215A
Bicycle Chain
brute force
,
implementation
900
x13990
214A
System of Equations
brute force
800
x33880
208D
Prizes, Prizes, more Prizes
implementation
1200
x7499
208A
Dubstep
strings
900
x84321
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x21664
203B
Game on Paper
brute force
,
implementation
1300
x2560
203A
Two Problems
brute force
,
implementation
1200
x4114
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15957
200B
Drinks
implementation
,
math
800
x108862
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25286
196A
Lexicographically Maximum Subsequence
greedy
,
strings
1100
x5312
195B
After Training
data structures
,
implementation
,
math
1300
x5130
195A
Let's Watch Football
binary search
,
brute force
,
math
1000
x8507
194B
Square
math
1200
x3440
194A
Exams
implementation
,
math
900
x9661
192B
Walking in the Rain
brute force
,
implementation
1100
x6153
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10169
190A
Vasya and the Bus
greedy
,
math
1100
x5722
189B
Counting Rhombi
brute force
,
math
1300
x3879
189A
Cut Ribbon
brute force
,
dp
1300
x63264
188D
Asterisks
*special problem
,
implementation
1100
x659
188B
A + Reverse B
*special problem
,
implementation
1300
x705
188A
Hexagonal Numbers
*special problem
1100
x765
186B
Growing Mushrooms
greedy
,
sortings
1200
x5341
186A
Comparing Strings
implementation
,
strings
1100
x16305
185A
Plant
math
1300
x5721
182B
Vasya's Calendar
implementation
1000
x6810
181B
Number of Triplets
binary search
,
brute force
1300
x2903
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