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Rayan
→ Pay attention
Before contest
Educational Codeforces Round 174 (Rated for Div. 2)
37:28:23
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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
186A
Comparing Strings
implementation
,
strings
1100
x17362
185E
Soap Time! - 2
binary search
,
data structures
3000
x147
185D
Visit of the Great
math
,
number theory
2600
x458
185C
Clever Fat Rat
dp
2500
x142
185B
Mushroom Scientists
math
,
ternary search
1800
x1682
185A
Plant
math
1300
x6020
183E
Candy Shop
greedy
2900
x140
183D
T-shirt
dp
,
greedy
,
probabilities
2700
x410
183C
Cyclic Coloring
dfs and similar
2200
x649
183B
Zoo
brute force
,
geometry
1700
x703
183A
Headquarters
constructive algorithms
,
math
1700
x564
182E
Wooden Fence
dp
1800
x1497
182D
Common Divisors
brute force
,
hashing
,
implementation
,
math
,
strings
1400
x8218
182C
Optimal Sum
data structures
,
greedy
2000
x758
182B
Vasya's Calendar
implementation
1000
x7003
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x292
181B
Number of Triplets
binary search
,
brute force
1300
x3094
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x7475
180F
Mathematical Analysis Rocks!
constructive algorithms
,
implementation
,
math
1200
x2559
180E
Cubes
binary search
,
dp
,
two pointers
1800
x1834
180D
Name
greedy
,
strings
1900
x739
180C
Letter
dp
1400
x7651
180B
Divisibility Rules
math
,
number theory
2300
x368
180A
Defragmentation
implementation
1800
x554
178F3
Representative Sampling
2500
x451
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x362
178F1
Representative Sampling
1800
x415
178E3
The Beaver's Problem - 2
2300
x203
178E2
The Beaver's Problem - 2
2000
x234
178E1
The Beaver's Problem - 2
1900
x293
178D3
Magic Squares
2100
x251
178D2
Magic Squares
1900
x274
178D1
Magic Squares
1500
x656
178C3
Smart Beaver and Resolving Collisions
2000
x329
178C2
Smart Beaver and Resolving Collisions
1900
x311
178C1
Smart Beaver and Resolving Collisions
1600
x501
178B3
Greedy Merchants
1800
x1269
178B2
Greedy Merchants
1600
x688
178B1
Greedy Merchants
1600
x776
178A3
Educational Game
greedy
1100
x1470
178A2
Educational Game
greedy
1000
x1669
178A1
Educational Game
1000
x1652
177G2
Fibonacci Strings
matrices
,
strings
2600
x207
177G1
Fibonacci Strings
strings
2400
x192
177F2
Script Generation
2300
x212
177F1
Script Generation
1800
x306
177E2
Space Voyage
binary search
1900
x440
177E1
Space Voyage
binary search
1700
x632
177D2
Encrypting Messages
data structures
1500
x2107
177D1
Encrypting Messages
brute force
1200
x2261
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2645
177C1
Party
dfs and similar
,
dsu
,
graphs
1500
x2647
177B2
Rectangular Game
number theory
1200
x3097
177B1
Rectangular Game
number theory
1000
x4369
177A2
Good Matrix Elements
implementation
800
x7746
177A1
Good Matrix Elements
implementation
800
x9639
176E
Archaeology
data structures
,
dfs and similar
,
trees
3100
x1257
176D
Hyper String
dp
2500
x333
176C
Playing with Superglue
combinatorics
,
constructive algorithms
2000
x490
176B
Word Cut
dp
1700
x1907
176A
Trading Business
greedy
,
sortings
1200
x1533
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x67
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x268
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x301
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1362
175B
Plane of Tanks: Pro
implementation
1400
x1441
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2431
174C
Range Increments
data structures
,
greedy
1800
x1172
174B
File List
dp
,
greedy
,
implementation
1400
x2317
174A
Problem About Equation
math
1100
x3009
173E
Camping Groups
data structures
,
sortings
2600
x579
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x256
173C
Spiral Maximum
brute force
,
dp
1900
x1010
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x3309
173A
Rock-Paper-Scissors
implementation
,
math
1300
x2342
172E
BHTML+BCSS
*special problem
,
dfs and similar
,
expression parsing
2200
x273
172D
Calendar Reform
*special problem
,
number theory
1500
x1414
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1155
172B
Pseudorandom Sequence Period
*special problem
,
implementation
,
number theory
1200
x2804
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6451
171H
A polyline
*special problem
,
implementation
1700
x288
171G
Mysterious numbers - 2
*special problem
1600
x951
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1308
171E
MYSTERIOUS LANGUAGE
*special problem
2000
x1485
171D
Broken checker
*special problem
,
brute force
1300
x2613
171C
A Piece of Cake
*special problem
,
implementation
2000
x1109
171B
Star
*special problem
,
combinatorics
1300
x4123
171A
Mysterious numbers - 1
*special problem
,
constructive algorithms
1200
x4558
169B
Replacing Digits
greedy
1100
x3387
169A
Chores
sortings
800
x7131
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1226
168A
Wizards and Demonstration
implementation
,
math
900
x10749
167E
Wizards and Bets
dfs and similar
,
graphs
,
math
,
matrices
2900
x585
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x201
167C
Wizards and Numbers
games
,
math
2300
x686
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2213
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2053
166E
Tetrahedron
dp
,
math
,
matrices
1500
x21947
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x369
166C
Median
greedy
,
math
,
sortings
1500
x6603
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