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Rayan
→ Pay attention
Before contest
Ethflow Round 1 (Codeforces Round, Div. 1 + Div. 2)
36:31:23
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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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Custom test
Problems
#
Name
1119C
Ramesses and Corner Inversion
constructive algorithms
,
greedy
,
implementation
,
math
1500
x6898
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x11631
1118E
Yet Another Ball Problem
constructive algorithms
,
implementation
1700
x4248
1118D2
Coffee and Coursework (Hard Version)
binary search
,
greedy
1700
x6400
1118D1
Coffee and Coursework (Easy version)
brute force
,
greedy
1700
x5739
1118C
Palindromic Matrix
constructive algorithms
,
implementation
1700
x5832
1115U3
Block unitary
*special problem
1700
x198
1115U2
Chessboard unitary
*special problem
1600
x236
1115U1
Anti-diagonal unitary
*special problem
1500
x258
1115G3
Palindrome checker oracle
*special problem
1600
x233
1115G2
OR oracle
*special problem
1600
x313
1114C
Trailing Loves (or L'oeufs?)
brute force
,
implementation
,
math
,
number theory
1700
x7464
1114B
Yet Another Array Partitioning Task
constructive algorithms
,
greedy
,
sortings
1500
x9047
1113B
Sasha and Magnetic Machines
greedy
,
number theory
1300
x7812
1111C
Creative Snap
binary search
,
brute force
,
divide and conquer
,
math
1700
x6364
1111B
Average Superhero Gang Power
brute force
,
implementation
,
math
1700
x6324
1110C
Meaningless Operations
constructive algorithms
,
math
,
number theory
1500
x9506
1110B
Tape
greedy
,
sortings
1400
x12136
1109A
Sasha and a Bit of Relax
dp
,
implementation
1600
x8589
1108D
Diverse Garland
constructive algorithms
,
dp
,
greedy
1400
x15470
1108C
Nice Garland
brute force
,
greedy
,
math
1300
x12074
1107C
Brutality
greedy
,
sortings
,
two pointers
1300
x10065
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x15296
1106B
Lunar New Year and Food Ordering
data structures
,
implementation
1500
x6810
1105C
Ayoub and Lost Array
combinatorics
,
dp
,
math
1500
x10531
1103A
Grid game
constructive algorithms
,
implementation
1400
x9929
1102E
Monotonic Renumeration
combinatorics
,
sortings
1700
x6156
1102D
Balanced Ternary String
greedy
,
strings
1500
x8113
1102B
Array K-Coloring
greedy
,
sortings
1400
x10529
1101E
Polycarp's New Job
implementation
1500
x7968
1101C
Division and Union
sortings
1500
x8444
1101B
Accordion
greedy
,
implementation
1300
x10668
1100B
Build a Contest
data structures
,
implementation
1300
x11242
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8916
1097C
Yuhao and a Parenthesis
greedy
,
implementation
1400
x8485
1096C
Polygon for the Angle
brute force
,
geometry
1600
x6886
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x10741
1095D
Circular Dance
implementation
1600
x7650
1095C
Powers Of Two
bitmasks
,
greedy
1400
x17373
1093D
Beautiful Graph
dfs and similar
,
graphs
1700
x9559
1093C
Mishka and the Last Exam
greedy
1300
x9469
1092C
Prefixes and Suffixes
strings
1700
x5985
1091D
New Year and the Permutation Concatenation
combinatorics
,
dp
,
math
1700
x6867
1091C
New Year and the Sphere Transmission
math
,
number theory
1400
x10138
1090A
Company Merging
greedy
1300
x4341
1089G
Guest Student
math
1500
x3011
1089E
Easy Chess
constructive algorithms
1700
x2046
1088C
Ehab and a 2-operation task
constructive algorithms
,
greedy
,
math
1400
x8174
1085D
Minimum Diameter Tree
constructive algorithms
,
implementation
,
trees
1700
x5571
1085C
Connect Three
implementation
,
math
1600
x5480
1084C
The Fair Nut and String
combinatorics
,
dp
,
implementation
1500
x8489
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5830
1082B
Vova and Trophies
greedy
1600
x7641
1081C
Colorful Bricks
combinatorics
,
dp
,
math
1500
x7419
1081B
Farewell Party
constructive algorithms
,
implementation
1500
x4506
1080C
Masha and two friends
implementation
1500
x4079
1077D
Cutting Out
binary search
,
sortings
1600
x9196
1077C
Good Array
1300
x18406
1076C
Meme Problem
binary search
,
math
1300
x12628
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6479
1070H
BerOS File Suggestion
brute force
,
implementation
1500
x3684
1070F
Debate
greedy
1500
x3691
1070D
Garbage Disposal
greedy
1300
x4959
1068C
Colored Rooks
constructive algorithms
,
graphs
1700
x3210
1068A
Birthday
math
1400
x6888
1066E
Binary Numbers AND Sum
data structures
,
implementation
,
math
1700
x6223
1066C
Books Queries
implementation
1400
x9772
1066B
Heaters
greedy
,
two pointers
1500
x8459
1065C
Make It Equal
greedy
1600
x7940
1065B
Vasya and Isolated Vertices
constructive algorithms
,
graphs
1300
x11021
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10502
1062C
Banh-mi
greedy
,
implementation
,
math
1600
x5539
1062B
Math
greedy
,
math
,
number theory
1500
x9018
1062A
A Prank
greedy
,
implementation
1300
x8890
1061C
Multiplicity
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x9194
1061B
Views Matter
greedy
,
implementation
,
sortings
1400
x7360
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4950
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7228
1059B
Forgery
implementation
1300
x7175
1057B
DDoS
*special problem
,
brute force
1400
x1851
1056D
Decorate Apple Tree
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
1600
x6056
1056C
Pick Heroes
greedy
,
implementation
,
interactive
,
sortings
1700
x2421
1056B
Divide Candies
math
,
number theory
1600
x4267
1055B
Alice and Hairdresser
dsu
,
implementation
1300
x5082
1054C
Candies Distribution
constructive algorithms
,
implementation
1500
x4326
1051D
Bicolorings
bitmasks
,
dp
1700
x7520
1051C
Vasya and Multisets
brute force
,
dp
,
greedy
,
implementation
,
math
1500
x9366
1046F
Splitting money
implementation
1400
x2813
1046C
Space Formula
greedy
1400
x3160
1045I
Palindrome Pairs
hashing
,
strings
1600
x4598
1044A
The Tower is Going Home
binary search
,
two pointers
1700
x2957
1043D
Mysterious Crime
brute force
,
combinatorics
,
math
,
meet-in-the-middle
,
two pointers
1700
x4510
1043C
Smallest Word
constructive algorithms
,
greedy
,
implementation
1500
x6965
1042C
Array Product
constructive algorithms
,
greedy
,
math
1700
x4770
1041D
Glider
binary search
,
data structures
,
two pointers
1700
x6048
1041C
Coffee Break
binary search
,
data structures
,
greedy
,
two pointers
1600
x9602
1040B
Shashlik Cooking
dp
,
greedy
,
math
1300
x7156
1038C
Gambling
greedy
,
sortings
1300
x9481
1037D
Valid BFS?
dfs and similar
,
graphs
,
shortest paths
,
trees
1700
x15325
1037C
Equalize
dp
,
greedy
,
strings
1300
x19073
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