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Codeforces Round (Div. 2)
3 days
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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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Custom test
Problems
#
Name
245F
Log Stream Analysis
binary search
,
brute force
,
implementation
,
strings
2000
x871
245E
Mishap in Club
greedy
,
implementation
1400
x3247
245B
Internet Address
implementation
,
strings
1100
x5154
245A
System Administrator
implementation
800
x8323
244A
Dividing Orange
implementation
900
x7795
243C
Colorado Potato Beetle
dfs and similar
,
implementation
2200
x524
242B
Big Segment
implementation
,
sortings
1100
x15388
242A
Heads or Tails
brute force
,
implementation
1100
x6297
241F
Race
brute force
,
implementation
2300
x261
241C
Mirror Box
geometry
,
implementation
2000
x509
239B
Easy Tape Programming
brute force
,
implementation
1500
x1364
239A
Two Bags of Potatoes
greedy
,
implementation
,
math
1200
x18382
238D
Tape Programming
data structures
,
implementation
2900
x246
237B
Young Table
implementation
,
sortings
1500
x2223
237A
Free Cash
implementation
1000
x26183
236B
Easy Number Challenge
implementation
,
number theory
1300
x13710
236A
Boy or Girl
brute force
,
implementation
,
strings
800
x198833
235E
Number Challenge
combinatorics
,
dp
,
implementation
,
math
,
number theory
2600
x761
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1463
234E
Champions' League
implementation
1600
x992
234D
Cinema
implementation
1600
x1518
234C
Weather
dp
,
implementation
1300
x5386
234A
Lefthanders and Righthanders
implementation
1200
x4396
233A
Perfect Permutation
implementation
,
math
800
x41177
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x71942
228B
Two Tables
brute force
,
implementation
1400
x3442
228A
Is your horseshoe on the other hoof?
implementation
800
x104721
227B
Effective Approach
implementation
1100
x27048
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x850
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x917
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7217
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2491
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2120
222B
Cosmic Tables
data structures
,
implementation
1300
x6017
222A
Shooshuns and Sequence
brute force
,
implementation
1200
x10498
221B
Little Elephant and Numbers
implementation
1300
x4525
221A
Little Elephant and Function
implementation
,
math
1000
x14888
220A
Little Elephant and Problem
implementation
,
sortings
1300
x11874
219B
Special Offer! Super Price 999 Bourles!
implementation
1400
x5746
219A
k-String
implementation
,
strings
1000
x26698
218B
Airport
implementation
1100
x16003
218A
Mountain Scenery
brute force
,
constructive algorithms
,
implementation
1100
x9090
216B
Forming Teams
dfs and similar
,
implementation
1700
x6189
216A
Tiling with Hexagons
implementation
,
math
1200
x4946
215C
Crosses
brute force
,
implementation
2100
x660
215A
Bicycle Chain
brute force
,
implementation
900
x14172
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x329
208D
Prizes, Prizes, more Prizes
implementation
1200
x7517
205A
Little Elephant and Rozdil
brute force
,
implementation
900
x21874
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1124
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1405
203B
Game on Paper
brute force
,
implementation
1300
x2563
203A
Two Problems
brute force
,
implementation
1200
x4122
202A
LLPS
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
strings
800
x16220
200E
Tractor College
implementation
,
math
,
number theory
,
ternary search
2400
x339
200D
Programming Language
binary search
,
brute force
,
expression parsing
,
implementation
1800
x899
200C
Football Championship
brute force
,
implementation
1800
x1035
200B
Drinks
implementation
,
math
800
x110630
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25628
198A
About Bacteria
implementation
,
math
1700
x3125
195C
Try and Catch
expression parsing
,
implementation
1800
x1128
195B
After Training
data structures
,
implementation
,
math
1300
x5145
194A
Exams
implementation
,
math
900
x9725
192B
Walking in the Rain
brute force
,
implementation
1100
x6187
192A
Funky Numbers
binary search
,
brute force
,
implementation
1300
x10216
188H
Stack
*special problem
,
expression parsing
,
implementation
1800
x246
188G
Array Sorting
*special problem
,
implementation
1600
x329
188F
Binary Notation
*special problem
,
implementation
1400
x292
188E
HQ9+
*special problem
,
implementation
1400
x494
188D
Asterisks
*special problem
,
implementation
1100
x662
188C
LCM
*special problem
,
implementation
,
math
1400
x443
188B
A + Reverse B
*special problem
,
implementation
1300
x721
186A
Comparing Strings
implementation
,
strings
1100
x16440
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x7881
182B
Vasya's Calendar
implementation
1000
x6835
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x280
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x6810
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2475
180A
Defragmentation
implementation
1800
x526
177A2
Good Matrix Elements
implementation
800
x7131
177A1
Good Matrix Elements
implementation
800
x8333
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x65
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1301
175B
Plane of Tanks: Pro
implementation
1400
x1384
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2359
174B
File List
dp
,
greedy
,
implementation
1400
x2209
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x247
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2246
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1132
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2697
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x5979
171H
A polyline
*special problem
,
implementation
1700
x272
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1260
171C
A Piece of Cake
*special problem
,
implementation
2000
x1067
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1206
168A
Wizards and Demonstration
implementation
,
math
900
x10404
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2017
166A
Rank List
binary search
,
implementation
,
sortings
1100
x17131
165B
Burning Midnight Oil
binary search
,
implementation
1500
x16986
165A
Supercentral Point
implementation
1000
x22996
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