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Before contest
Codeforces Round 951 (Div. 2)
12:33:44
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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
1142E
Pink Floyd
graphs
,
interactive
3200
x488
1142D
Foreigner
dp
2800
x477
1142C
U2
geometry
2400
x1312
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2796
1142A
The Beatles
brute force
,
math
1700
x3397
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2199
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4080
1141F1
Same Sum Blocks (Easy)
greedy
1900
x3755
1141E
Superhero Battle
math
1700
x6615
1141D
Colored Boots
greedy
,
implementation
1500
x8395
1141C
Polycarp Restores Permutation
math
1500
x11278
1141B
Maximal Continuous Rest
implementation
900
x20724
1141A
Game 23
implementation
,
math
1000
x29966
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x468
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1132
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1897
1140D
Minimum Triangulation
dp
,
greedy
,
math
1200
x12410
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9308
1140B
Good String
implementation
,
strings
1200
x11157
1140A
Detective Book
implementation
1000
x12083
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x371
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1683
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x2001
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12117
1139B
Chocolates
greedy
,
implementation
1000
x15760
1139A
Even Substrings
implementation
,
strings
800
x16480
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x3947
1138A
Sushi for Two
binary search
,
greedy
,
implementation
900
x17495
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x463
1137E
Train Car Selection
data structures
,
greedy
2700
x493
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1483
1137C
Museums Tour
dp
,
graphs
,
implementation
2500
x1162
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x5926
1137A
Skyscrapers
implementation
,
sortings
1600
x4435
1136E
Nastya Hasn't Written a Legend
binary search
,
data structures
2200
x1045
1136D
Nastya Is Buying Lunch
greedy
1800
x3752
1136C
Nastya Is Transposing Matrices
constructive algorithms
,
sortings
1500
x7629
1136B
Nastya Is Playing Computer Games
constructive algorithms
,
math
1000
x11550
1136A
Nastya Is Reading a Book
implementation
800
x16154
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3156
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7400
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5240
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x11056
1133C
Balanced Team
sortings
,
two pointers
1200
x21496
1133B
Preparation for International Women's Day
math
,
number theory
1200
x12416
1133A
Middle of the Contest
implementation
1000
x16549
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x963
1132F
Clear the String
dp
2000
x7384
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1417
1132D
Stressful Training
binary search
,
greedy
2300
x1822
1132C
Painting the Fence
brute force
1700
x5350
1132B
Discounts
greedy
,
sortings
900
x12768
1132A
Regular Bracket Sequence
greedy
,
implementation
1100
x9499
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x403
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6420
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1124
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3178
1131C
Birthday
binary search
,
greedy
,
sortings
1200
x14577
1131B
Draw!
greedy
,
implementation
1400
x9628
1131A
Sea Battle
math
800
x12341
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8360
1130B
Two Cakes
greedy
1200
x7709
1130A
Be Positive
implementation
800
x11485
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x416
1129D
Isolation
data structures
,
dp
2900
x957
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x899
1129B
Wrong Answer
constructive algorithms
2000
x2160
1129A2
Toy Train
brute force
,
greedy
1800
x4052
1129A1
Toy Train (Simplified)
brute force
,
greedy
1700
x3779
1121C
System Testing
implementation
1600
x1943
1121B
Mike and Children
brute force
,
implementation
1200
x8666
1121A
Technogoblet of Fire
implementation
,
sortings
1100
x7111
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x251
1120E
The very same Munchhausen
brute force
2600
x113
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1276
1120C
Compress String
dp
,
strings
2100
x1995
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x409
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1623
1119H
Triple
fft
,
math
3200
x521
1119G
Get Ready for the Battle
constructive algorithms
,
implementation
3100
x429
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x679
1119E
Pavel and Triangles
brute force
,
dp
,
fft
,
greedy
,
ternary search
1900
x4906
1119D
Frets On Fire
binary search
,
sortings
1800
x4567
1119C
Ramesses and Corner Inversion
constructive algorithms
,
greedy
,
implementation
,
math
1500
x6614
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x10011
1119A
Ilya and a Colorful Walk
greedy
,
implementation
1100
x10484
1118F2
Tree Cutting (Hard Version)
combinatorics
,
dfs and similar
,
dp
,
trees
2700
x517
1118F1
Tree Cutting (Easy Version)
dfs and similar
,
trees
1800
x5730
1118E
Yet Another Ball Problem
constructive algorithms
,
implementation
1700
x4057
1118D2
Coffee and Coursework (Hard Version)
binary search
,
greedy
1700
x6090
1118D1
Coffee and Coursework (Easy version)
brute force
,
greedy
1700
x5553
1118C
Palindromic Matrix
constructive algorithms
,
implementation
1700
x5678
1118B
Tanya and Candies
implementation
1200
x11861
1118A
Water Buying
math
800
x19773
1117G
Recursive Queries
data structures
2500
x657
1117F
Crisp String
bitmasks
,
dp
2500
x518
1117E
Decypher the String
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
interactive
,
math
2200
x1457
1117D
Magic Gems
dp
,
math
,
matrices
2100
x4040
1117C
Magic Ship
binary search
1900
x6481
1117B
Emotes
greedy
,
math
,
sortings
1000
x13889
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