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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
21:53:43
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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
1061F
Lost Root
interactive
,
probabilities
2400
x765
1061E
Politics
flows
,
graphs
2600
x538
1061D
TV Shows
data structures
,
greedy
,
implementation
,
sortings
2000
x2389
1061C
Multiplicity
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9092
1061B
Views Matter
greedy
,
implementation
,
sortings
1400
x7335
1061A
Coins
greedy
,
implementation
,
math
800
x22195
1060H
Sophisticated Device
constructive algorithms
3300
x213
1060G
Balls and Pockets
data structures
3400
x159
1060F
Shrinking Tree
combinatorics
,
dp
2900
x609
1060E
Sergey and Subway
dfs and similar
,
dp
,
trees
2000
x3201
1060D
Social Circles
greedy
,
math
1900
x3650
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4929
1060B
Maximum Sum of Digits
greedy
1100
x8994
1060A
Phone Numbers
brute force
800
x14416
1059E
Split the Tree
binary search
,
data structures
,
dp
,
greedy
,
trees
2400
x1463
1059D
Nature Reserve
binary search
,
geometry
,
ternary search
2200
x2791
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7208
1059B
Forgery
implementation
1300
x7144
1059A
Cashier
implementation
1000
x12974
1057C
Tanya and Colored Candies
*special problem
,
dp
2000
x950
1057B
DDoS
*special problem
,
brute force
1400
x1847
1057A
Bmail Computer Network
*special problem
,
dfs and similar
,
trees
900
x6236
1056H
Detect Robots
data structures
,
strings
3200
x159
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x264
1056F
Write The Contest
binary search
,
dp
,
math
2500
x664
1056E
Check Transcription
brute force
,
data structures
,
hashing
,
strings
2100
x2305
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x6009
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2412
1056B
Divide Candies
math
,
number theory
1600
x4246
1056A
Determine Line
implementation
800
x6774
1055G
Jellyfish Nightmare
3500
x85
1055F
Tree and XOR
strings
,
trees
2900
x484
1055E
Segments on the Line
binary search
,
dp
2500
x740
1055D
Refactoring
greedy
,
implementation
,
strings
2400
x629
1055C
Lucky Days
math
,
number theory
1900
x1942
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x5069
1055A
Metro
graphs
900
x10876
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x182
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x300
1054F
Electric Scheme
flows
,
graph matchings
2700
x321
1054E
Chips Puzzle
constructive algorithms
,
implementation
,
math
2400
x488
1054D
Changing Array
greedy
,
implementation
1900
x2267
1054C
Candies Distribution
constructive algorithms
,
implementation
1500
x4311
1054B
Appending Mex
implementation
1000
x6636
1054A
Elevator or Stairs?
implementation
800
x9118
1053E
Euler tour
constructive algorithms
,
trees
3500
x210
1051G
Distinctification
data structures
,
dsu
,
greedy
2900
x405
1051F
The Shortest Statement
graphs
,
shortest paths
,
trees
2400
x3000
1051E
Vasya and Big Integers
binary search
,
data structures
,
dp
,
hashing
,
strings
2600
x986
1051D
Bicolorings
bitmasks
,
dp
1700
x7470
1051C
Vasya and Multisets
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9334
1051B
Relatively Prime Pairs
greedy
,
math
,
number theory
1000
x17329
1051A
Vasya And Password
greedy
,
implementation
,
strings
1200
x8474
1047B
Cover Points
geometry
,
math
900
x17383
1047A
Little C Loves 3 I
math
800
x20169
1046I
Say Hello
geometry
2300
x524
1046F
Splitting money
implementation
1400
x2808
1046C
Space Formula
greedy
1400
x3133
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x172
1045I
Palindrome Pairs
hashing
,
strings
1600
x4553
1045H
Self-exploration
math
2400
x381
1045G
AI robots
data structures
2200
x1729
1045F
Shady Lady
geometry
,
math
3400
x102
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x234
1045D
Interstellar battle
math
,
probabilities
,
trees
2200
x716
1045C
Hyperspace Highways
dfs and similar
,
graphs
,
trees
2300
x717
1045B
Space Isaac
hashing
,
number theory
2400
x521
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x542
1044F
DFS
data structures
2700
x586
1044E
Grid Sort
implementation
3100
x120
1044D
Deduction Queries
data structures
,
dsu
2400
x1029
1044C
Optimal Polygon Perimeter
dp
,
geometry
2100
x1358
1044B
Intersecting Subtrees
dfs and similar
,
interactive
,
trees
1900
x1584
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2913
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x238
1043F
Make It One
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
,
shortest paths
2500
x2477
1043E
Train Hard, Win Easy
constructive algorithms
,
greedy
,
math
,
sortings
1900
x2792
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4475
1043C
Smallest Word
constructive algorithms
,
greedy
,
implementation
1500
x6922
1043B
Lost Array
implementation
1200
x6319
1043A
Elections
implementation
,
math
800
x10856
1042F
Leaf Sets
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2400
x1327
1042E
Vasya and Magic Matrix
dp
,
math
,
probabilities
2300
x1818
1042D
Petya and Array
data structures
,
divide and conquer
,
two pointers
1800
x6313
1042C
Array Product
constructive algorithms
,
greedy
,
math
1700
x4732
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x16504
1042A
Benches
binary search
,
implementation
1100
x13060
1041F
Ray in the tube
data structures
,
divide and conquer
,
dp
,
math
2500
x1507
1041E
Tree Reconstruction
constructive algorithms
,
data structures
,
graphs
,
greedy
1900
x3620
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x6019
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9541
1041B
Buying a TV Set
math
1000
x14111
1041A
Heist
greedy
,
implementation
,
sortings
800
x25311
1040B
Shashlik Cooking
dp
,
greedy
,
math
1300
x7143
1040A
Palindrome Dance
greedy
1000
x9626
1039E
Summer Oenothera Exhibition
data structures
3400
x274
1039D
You Are Given a Tree
data structures
,
dp
,
trees
2800
x1863
1039C
Network Safety
dfs and similar
,
dsu
,
graphs
,
math
,
sortings
2200
x1371
1039B
Subway Pursuit
binary search
,
interactive
,
probabilities
2100
x2385
1039A
Timetable
constructive algorithms
,
data structures
,
greedy
,
math
2300
x794
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