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Before contest
Codeforces Round 973 (Div. 2)
00:56:24
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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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Custom test
Problems
#
Name
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1098
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3677
1146B
Hate "A"
implementation
,
strings
1100
x8551
1146A
Love "A"
implementation
,
strings
800
x21824
1145G
AI Takeover
interactive
x169
1145F
Neat Words
x507
1145E
Fourier Doodles
x423
1145D
Pigeon d'Or
implementation
x1156
1145C
Mystery Circuit
bitmasks
,
brute force
x798
1145B
Kanban Numbers
brute force
x1448
1145A
Thanos Sort
implementation
x8588
1144G
Two Merged Sequences
dp
,
greedy
2400
x1967
1144F
Graph Without Long Directed Paths
dfs and similar
,
graphs
1700
x11551
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4144
1144D
Equalize Them All
constructive algorithms
,
greedy
1400
x10245
1144C
Two Shuffled Sequences
constructive algorithms
,
sortings
1000
x15301
1144B
Parity Alternated Deletions
greedy
,
implementation
,
sortings
900
x17044
1144A
Diverse Strings
implementation
,
strings
800
x19197
1143C
Queen
dfs and similar
,
trees
1400
x12288
1143B
Nirvana
brute force
,
math
,
number theory
1200
x10478
1143A
The Doors
implementation
800
x13252
1142E
Pink Floyd
graphs
,
interactive
3200
x509
1142D
Foreigner
dp
2800
x500
1142C
U2
geometry
2400
x1347
1142B
Lynyrd Skynyrd
data structures
,
dfs and similar
,
dp
,
math
,
trees
2000
x2933
1142A
The Beatles
brute force
,
math
1700
x3416
1141G
Privatization of Roads in Treeland
binary search
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x2264
1141F2
Same Sum Blocks (Hard)
data structures
,
greedy
1900
x4182
1141F1
Same Sum Blocks (Easy)
greedy
1900
x3845
1141E
Superhero Battle
math
1700
x6727
1141D
Colored Boots
greedy
,
implementation
1500
x8510
1141C
Polycarp Restores Permutation
math
1500
x11420
1141B
Maximal Continuous Rest
implementation
900
x21190
1141A
Game 23
implementation
,
math
1000
x31542
1140G
Double Tree
data structures
,
divide and conquer
,
shortest paths
,
trees
2700
x493
1140F
Extending Set of Points
data structures
,
divide and conquer
,
dsu
2600
x1204
1140E
Palindrome-less Arrays
combinatorics
,
divide and conquer
,
dp
2200
x1928
1140D
Minimum Triangulation
dp
,
greedy
,
math
1200
x12553
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9535
1140B
Good String
implementation
,
strings
1200
x11293
1140A
Detective Book
implementation
1000
x12282
1139F
Dish Shopping
data structures
,
divide and conquer
2500
x432
1139E
Maximize Mex
flows
,
graph matchings
,
graphs
2400
x1804
1139D
Steps to One
dp
,
math
,
number theory
,
probabilities
2300
x2293
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12542
1139B
Chocolates
greedy
,
implementation
1000
x16300
1139A
Even Substrings
implementation
,
strings
800
x16758
1138B
Circus
brute force
,
greedy
,
math
,
strings
1800
x4019
1138A
Sushi for Two
binary search
,
greedy
,
implementation
900
x18092
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x466
1137E
Train Car Selection
data structures
,
greedy
2700
x509
1137D
Cooperative Game
constructive algorithms
,
interactive
,
number theory
2400
x1581
1137C
Museums Tour
dp
,
graphs
,
implementation
2500
x1200
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6125
1137A
Skyscrapers
implementation
,
sortings
1600
x4464
1136E
Nastya Hasn't Written a Legend
binary search
,
data structures
2200
x1061
1136D
Nastya Is Buying Lunch
greedy
1800
x3806
1136C
Nastya Is Transposing Matrices
constructive algorithms
,
sortings
1500
x7699
1136B
Nastya Is Playing Computer Games
constructive algorithms
,
math
1000
x11677
1136A
Nastya Is Reading a Book
implementation
800
x16361
1133F2
Spanning Tree with One Fixed Degree
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x3334
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7763
1133E
K Balanced Teams
dp
,
sortings
,
two pointers
1800
x5451
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x11715
1133C
Balanced Team
sortings
,
two pointers
1200
x22678
1133B
Preparation for International Women's Day
math
,
number theory
1200
x12720
1133A
Middle of the Contest
implementation
1000
x17242
1132G
Greedy Subsequences
data structures
,
dp
,
trees
2400
x1013
1132F
Clear the String
dp
2000
x8131
1132E
Knapsack
dfs and similar
,
dp
,
greedy
2300
x1459
1132D
Stressful Training
binary search
,
greedy
2300
x1914
1132C
Painting the Fence
brute force
1700
x5423
1132B
Discounts
greedy
,
sortings
900
x12905
1132A
Regular Bracket Sequence
greedy
,
implementation
1100
x9570
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x430
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6650
1131E
String Multiplication
dp
,
greedy
,
strings
2300
x1142
1131D
Gourmet choice
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
2000
x3249
1131C
Birthday
binary search
,
greedy
,
sortings
1200
x14792
1131B
Draw!
greedy
,
implementation
1400
x9715
1131A
Sea Battle
math
800
x12395
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8559
1130B
Two Cakes
greedy
1200
x7907
1130A
Be Positive
implementation
800
x11607
1129E
Legendary Tree
binary search
,
interactive
,
trees
3100
x432
1129D
Isolation
data structures
,
dp
2900
x1053
1129C
Morse Code
binary search
,
data structures
,
dp
,
hashing
,
sortings
,
string suffix structures
,
strings
2400
x918
1129B
Wrong Answer
constructive algorithms
2000
x2197
1129A2
Toy Train
brute force
,
greedy
1800
x4094
1129A1
Toy Train (Simplified)
brute force
,
greedy
1700
x3816
1121C
System Testing
implementation
1600
x1991
1121B
Mike and Children
brute force
,
implementation
1200
x8929
1121A
Technogoblet of Fire
implementation
,
sortings
1100
x7173
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x256
1120E
The very same Munchhausen
brute force
2600
x122
1120D
Power Tree
dfs and similar
,
dp
,
dsu
,
graphs
,
greedy
,
trees
2500
x1354
1120C
Compress String
dp
,
strings
2100
x2097
1120B
Once in a casino
constructive algorithms
,
greedy
,
implementation
,
math
2700
x420
1120A
Diana and Liana
greedy
,
implementation
,
two pointers
1900
x1634
1119H
Triple
fft
,
math
3200
x559
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