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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
34:21:05
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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
1144C
Two Shuffled Sequences
constructive algorithms
,
sortings
1000
x15518
1144B
Parity Alternated Deletions
greedy
,
implementation
,
sortings
900
x17213
1144A
Diverse Strings
implementation
,
strings
800
x19479
1143C
Queen
dfs and similar
,
trees
1400
x12866
1143B
Nirvana
brute force
,
math
,
number theory
1200
x10640
1143A
The Doors
implementation
800
x13312
1142E
Pink Floyd
graphs
,
interactive
3200
x523
1142D
Foreigner
dp
2800
x535
1142C
U2
geometry
2400
x1396
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x3103
1142A
The Beatles
brute force
,
math
1700
x3466
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2314
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4248
1141F1
Same Sum Blocks (Easy)
greedy
1900
x3907
1141E
Superhero Battle
math
1700
x6809
1141D
Colored Boots
greedy
,
implementation
1500
x8604
1141C
Polycarp Restores Permutation
math
1500
x11572
1141B
Maximal Continuous Rest
implementation
900
x21540
1141A
Game 23
implementation
,
math
1000
x32621
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x508
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1256
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1960
1140D
Minimum Triangulation
dp
,
greedy
,
math
1200
x12704
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9672
1140B
Good String
implementation
,
strings
1200
x11390
1140A
Detective Book
implementation
1000
x12377
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x441
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1863
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x2388
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12887
1139B
Chocolates
greedy
,
implementation
1000
x16645
1139A
Even Substrings
implementation
,
strings
800
x16863
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x4045
1138A
Sushi for Two
binary search
,
greedy
,
implementation
900
x18790
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x472
1137E
Train Car Selection
data structures
,
greedy
2700
x524
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1668
1137C
Museums Tour
dp
,
graphs
,
implementation
2500
x1218
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6220
1137A
Skyscrapers
implementation
,
sortings
1600
x4499
1136E
Nastya Hasn't Written a Legend
binary search
,
data structures
2200
x1090
1136D
Nastya Is Buying Lunch
greedy
1800
x3836
1136C
Nastya Is Transposing Matrices
constructive algorithms
,
sortings
1500
x7744
1136B
Nastya Is Playing Computer Games
constructive algorithms
,
math
1000
x11784
1136A
Nastya Is Reading a Book
implementation
800
x16488
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3428
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7953
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5598
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x12304
1133C
Balanced Team
sortings
,
two pointers
1200
x23713
1133B
Preparation for International Women's Day
math
,
number theory
1200
x13022
1133A
Middle of the Contest
implementation
1000
x17794
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x1048
1132F
Clear the String
dp
2000
x8466
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1524
1132D
Stressful Training
binary search
,
greedy
2300
x1948
1132C
Painting the Fence
brute force
1700
x5459
1132B
Discounts
greedy
,
sortings
900
x13126
1132A
Regular Bracket Sequence
greedy
,
implementation
1100
x9654
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x450
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6780
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1159
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3339
1131C
Birthday
binary search
,
greedy
,
sortings
1200
x14963
1131B
Draw!
greedy
,
implementation
1400
x9774
1131A
Sea Battle
math
800
x12489
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8711
1130B
Two Cakes
greedy
1200
x7950
1130A
Be Positive
implementation
800
x11720
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x444
1129D
Isolation
data structures
,
dp
2900
x1106
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x931
1129B
Wrong Answer
constructive algorithms
2000
x2219
1129A2
Toy Train
brute force
,
greedy
1800
x4114
1129A1
Toy Train (Simplified)
brute force
,
greedy
1700
x3834
1121C
System Testing
implementation
1600
x2014
1121B
Mike and Children
brute force
,
implementation
1200
x9148
1121A
Technogoblet of Fire
implementation
,
sortings
1100
x7218
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x261
1120E
The very same Munchhausen
brute force
2600
x129
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1444
1120C
Compress String
dp
,
strings
2100
x2125
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x434
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1648
1119H
Triple
fft
,
math
3200
x582
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x507
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x734
1119E
Pavel and Triangles
brute force
,
dp
,
fft
,
greedy
,
ternary search
1900
x5086
1119D
Frets On Fire
binary search
,
sortings
1800
x4885
1119C
Ramesses and Corner Inversion
constructive algorithms
,
greedy
,
implementation
,
math
1500
x6884
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x11386
1119A
Ilya and a Colorful Walk
greedy
,
implementation
1100
x10897
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x548
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x6033
1118E
Yet Another Ball Problem
constructive algorithms
,
implementation
1700
x4239
1118D2
Coffee and Coursework (Hard Version)
binary search
,
greedy
1700
x6368
1118D1
Coffee and Coursework (Easy version)
brute force
,
greedy
1700
x5723
1118C
Palindromic Matrix
constructive algorithms
,
implementation
1700
x5811
1118B
Tanya and Candies
implementation
1200
x12315
1118A
Water Buying
math
800
x20269
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