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Educational Codeforces Round 166 (Rated for Div. 2)
30:40:53
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Difficulty:
—
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
#
Name
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x70584
228B
Two Tables
brute force
,
implementation
1400
x3434
228A
Is your horseshoe on the other hoof?
implementation
800
x102887
227B
Effective Approach
implementation
1100
x26627
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x847
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x914
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7176
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2484
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2094
222B
Cosmic Tables
data structures
,
implementation
1300
x5988
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10410
221B
Little Elephant and Numbers
implementation
1300
x4512
221A
Little Elephant and Function
implementation
,
math
1000
x14758
220A
Little Elephant and Problem
implementation
,
sortings
1300
x11825
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x5706
219A
k-String
implementation
,
strings
1000
x26204
218B
Airport
implementation
1100
x15821
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x8951
216B
Forming Teams
dfs and similar
,
implementation
1700
x6117
216A
Tiling with Hexagons
implementation
,
math
1200
x4922
215C
Crosses
brute force
,
implementation
2100
x524
215A
Bicycle Chain
brute force
,
implementation
900
x13981
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x322
208D
Prizes, Prizes, more Prizes
implementation
1200
x7498
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x21646
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1100
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1401
203B
Game on Paper
brute force
,
implementation
1300
x2559
203A
Two Problems
brute force
,
implementation
1200
x4114
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x15947
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x333
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x879
200C
Football Championship
brute force
,
implementation
1800
x1005
200B
Drinks
implementation
,
math
800
x108746
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25252
198A
About Bacteria
implementation
,
math
1700
x3115
195C
Try and Catch
expression parsing
,
implementation
1800
x1113
195B
After Training
data structures
,
implementation
,
math
1300
x5129
194A
Exams
implementation
,
math
900
x9660
192B
Walking in the Rain
brute force
,
implementation
1100
x6153
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10162
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x245
188G
Array Sorting
*special problem
,
implementation
1600
x326
188F
Binary Notation
*special problem
,
implementation
1400
x289
188E
HQ9+
*special problem
,
implementation
1400
x491
188D
Asterisks
*special problem
,
implementation
1100
x659
188C
LCM
*special problem
,
implementation
,
math
1400
x435
188B
A + Reverse B
*special problem
,
implementation
1300
x704
186A
Comparing Strings
implementation
,
strings
1100
x16294
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7839
182B
Vasya's Calendar
implementation
1000
x6809
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x279
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x6730
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2459
180A
Defragmentation
implementation
1800
x523
177A2
Good Matrix Elements
implementation
800
x7073
177A1
Good Matrix Elements
implementation
800
x8203
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x64
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1291
175B
Plane of Tanks: Pro
implementation
1400
x1379
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2350
174B
File List
dp
,
greedy
,
implementation
1400
x2193
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x246
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2233
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1130
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2691
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5912
171H
A polyline
*special problem
,
implementation
1700
x267
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1253
171C
A Piece of Cake
*special problem
,
implementation
2000
x1054
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1200
168A
Wizards and Demonstration
implementation
,
math
900
x10333
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2014
166A
Rank List
binary search
,
implementation
,
sortings
1100
x16868
165B
Burning Midnight Oil
binary search
,
implementation
1500
x16621
165A
Supercentral Point
implementation
1000
x22719
162A
Pentagonal numbers
*special problem
,
implementation
1100
x796
160C
Find Pair
implementation
,
math
,
sortings
1700
x3386
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2457
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x8921
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x82920
158A
Next Round
*special problem
,
implementation
800
x234349
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2192
152B
Steps
binary search
,
implementation
1300
x6362
152A
Marks
implementation
900
x16255
151B
Phone Numbers
implementation
,
strings
1200
x6239
151A
Soft Drinking
implementation
,
math
800
x66601
149B
Martian Clock
implementation
1600
x2228
149A
Business trip
greedy
,
implementation
,
sortings
900
x38021
148B
Escape
implementation
,
math
1500
x5291
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x87766
147A
Punctuation
implementation
,
strings
1300
x3564
146B
Lucky Mask
brute force
,
implementation
1300
x4243
146A
Lucky Ticket
implementation
800
x14668
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x241
145A
Lucky Conversion
greedy
,
implementation
1200
x6964
144C
Anagram Search
implementation
,
strings
1500
x3891
144B
Meeting
implementation
1300
x5061
144A
Arrival of the General
implementation
800
x89779
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4920
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