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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
27:11:58
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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
#
Name
859F
Ordering T-Shirts
greedy
2800
x187
859E
Desk Disorder
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
trees
2100
x1877
859D
Third Month Insanity
dp
,
probabilities
,
trees
2100
x1054
859C
Pie Rules
dp
,
games
1500
x5476
859B
Lazy Security Guard
brute force
,
geometry
,
math
1000
x7089
859A
Declined Finalists
greedy
,
implementation
800
x7805
858F
Wizard's Tour
constructive algorithms
,
dfs and similar
,
graphs
2300
x1654
858E
Tests Renumeration
greedy
,
implementation
2200
x510
858D
Polycarp's phone book
data structures
,
implementation
,
sortings
1600
x3862
858C
Did you mean...
dp
,
greedy
,
implementation
1500
x5639
858B
Which floor?
brute force
,
implementation
1500
x3758
858A
k-rounding
brute force
,
math
,
number theory
1100
x8113
856F
To Play or not to Play
greedy
3000
x105
856E
Satellites
3100
x72
856D
Masha and Cactus
dp
,
trees
2400
x414
856C
Eleventh Birthday
combinatorics
,
dp
,
math
2400
x629
856B
Similar Words
dp
,
hashing
,
strings
,
trees
2300
x519
856A
Set Theory
brute force
,
constructive algorithms
1600
x1449
855G
Harry Vs Voldemort
dfs and similar
,
dp
,
graphs
,
trees
3300
x222
855F
Nagini
binary search
,
data structures
3100
x460
855E
Salazar Slytherin's Locket
bitmasks
,
dp
2200
x1819
855D
Rowena Ravenclaw's Diadem
trees
2500
x531
855C
Helga Hufflepuff's Cup
dp
,
trees
2000
x2106
855B
Marvolo Gaunt's Ring
brute force
,
data structures
,
dp
1500
x8786
855A
Tom Riddle's Diary
brute force
,
implementation
,
strings
800
x22268
854B
Maxim Buys an Apartment
constructive algorithms
,
math
1200
x8217
854A
Fraction
brute force
,
constructive algorithms
,
math
800
x13699
853E
Lada Malina
data structures
,
geometry
3400
x68
853D
Michael and Charging Stations
binary search
,
dp
,
greedy
2400
x678
853C
Boredom
data structures
2100
x1515
853B
Jury Meeting
greedy
,
sortings
,
two pointers
1800
x2535
853A
Planning
greedy
1500
x5905
852I
Dating
brute force
,
dfs and similar
,
graphs
,
trees
2300
x585
852H
Bob and stages
dp
,
geometry
3000
x152
852G
Bathroom terminal
implementation
1700
x1295
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x580
852E
Casinos and travel
dp
2100
x1067
852D
Exploration plan
binary search
,
flows
,
graph matchings
,
shortest paths
2100
x1057
852C
Property
greedy
,
sortings
2100
x601
852B
Neural Network country
dp
,
matrices
2000
x1487
852A
Digits
brute force
,
implementation
,
math
2500
x393
851B
Arpa and an exam about geometry
geometry
,
math
1400
x5585
851A
Arpa and a research in Mexican wave
implementation
,
math
800
x9826
850F
Rainbow Balls
math
2800
x671
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x406
850D
Tournament Construction
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
2800
x394
850C
Arpa and a game with Mojtaba
bitmasks
,
dp
,
games
2200
x1522
850B
Arpa and a list of numbers
implementation
,
number theory
2100
x2036
850A
Five Dimensional Points
brute force
,
geometry
,
math
1700
x3216
849B
Tell Your World
brute force
,
geometry
1600
x3679
849A
Odds and Ends
implementation
1000
x9175
848E
Days of Floral Colours
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
3400
x216
848D
Shake It!
combinatorics
,
dp
,
flows
,
graphs
2900
x386
848C
Goodbye Souvenir
data structures
,
divide and conquer
2600
x1395
848B
Rooter's Song
constructive algorithms
,
data structures
,
geometry
,
implementation
,
sortings
,
two pointers
1900
x1910
848A
From Y to Y
constructive algorithms
1600
x5178
847M
Weather Tomorrow
implementation
,
math
1000
x6327
847L
Berland SU Computer Network
constructive algorithms
,
dfs and similar
,
graphs
,
hashing
,
trees
2400
x321
847K
Travel Cards
greedy
,
implementation
,
sortings
1800
x1706
847J
Students Initiation
binary search
,
flows
,
graphs
2400
x643
847I
Noise Level
dfs and similar
,
implementation
,
math
1900
x1535
847H
Load Testing
greedy
1600
x2463
847G
University Classes
implementation
900
x6885
847F
Berland Elections
greedy
,
sortings
2100
x869
847E
Packmen
binary search
,
dp
1800
x3118
847D
Dog Show
constructive algorithms
,
data structures
,
greedy
2200
x1225
847C
Sum of Nestings
constructive algorithms
1800
x2386
847B
Preparing for Merge Sort
binary search
,
data structures
1600
x5093
847A
Union of Doubly Linked Lists
implementation
1500
x3452
846F
Random Query
data structures
,
math
,
probabilities
,
two pointers
1800
x2310
846E
Chemistry in Berland
dfs and similar
,
greedy
,
trees
2300
x911
846D
Monitor
binary search
,
data structures
1900
x2544
846C
Four Segments
brute force
,
data structures
,
dp
1800
x2733
846B
Math Show
brute force
,
greedy
1800
x2535
846A
Curriculum Vitae
brute force
,
implementation
1500
x4304
845G
Shortest Path Problem?
dfs and similar
,
graphs
,
math
2300
x1716
845F
Guards In The Storehouse
bitmasks
,
dp
2500
x462
845E
Fire in the City
binary search
,
data structures
2400
x610
845D
Driving Test
data structures
,
dp
,
greedy
1800
x2401
845C
Two TVs
data structures
,
greedy
,
sortings
1500
x8939
845B
Luba And The Ticket
brute force
,
greedy
,
implementation
1600
x5058
845A
Chess Tourney
implementation
,
sortings
1100
x7831
844B
Rectangles
combinatorics
,
math
1300
x7570
844A
Diversity
greedy
,
implementation
,
strings
1000
x11095
843E
Maximum Flow
flows
,
graphs
3000
x329
843D
Dynamic Shortest Path
graphs
,
shortest paths
3400
x932
843C
Upgrading Tree
constructive algorithms
,
dfs and similar
,
graphs
,
math
,
trees
2600
x364
843B
Interactive LowerBound
brute force
,
interactive
,
probabilities
2000
x2325
843A
Sorting by Subsequences
dfs and similar
,
dsu
,
implementation
,
math
,
sortings
1400
x5697
842E
Nikita and game
binary search
,
dfs and similar
,
divide and conquer
,
graphs
,
trees
2800
x433
842D
Vitya and Strange Lesson
binary search
,
data structures
2000
x3723
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3521
842B
Gleb And Pizza
geometry
1100
x10412
842A
Kirill And The Game
brute force
,
two pointers
1200
x10279
841B
Godsend
games
,
math
1100
x12344
841A
Generous Kefa
brute force
,
implementation
900
x13290
840E
In a Trap
trees
3200
x501
840D
Destiny
data structures
,
probabilities
2500
x3108
840C
On the Bench
combinatorics
,
dp
2500
x1804
840B
Leha and another game about graph
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
graphs
2100
x2500
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