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Educational Codeforces Round 169 (Rated for Div. 2)
08:03:12
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Difficulty:
—
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
1147A
Hide and Seek
graphs
1500
x5185
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3657
1144F
Graph Without Long Directed Paths
dfs and similar
,
graphs
1700
x11389
1144D
Equalize Them All
constructive algorithms
,
greedy
1400
x10186
1143C
Queen
dfs and similar
,
trees
1400
x12010
1142A
The Beatles
brute force
,
math
1700
x3404
1141E
Superhero Battle
math
1700
x6698
1141D
Colored Boots
greedy
,
implementation
1500
x8476
1141C
Polycarp Restores Permutation
math
1500
x11376
1140C
Playlist
brute force
,
data structures
,
sortings
1600
x9475
1139C
Edgy Trees
dfs and similar
,
dsu
,
graphs
,
math
,
trees
1500
x12385
1137B
Camp Schedule
greedy
,
hashing
,
strings
1600
x6046
1137A
Skyscrapers
implementation
,
sortings
1600
x4454
1136C
Nastya Is Transposing Matrices
constructive algorithms
,
sortings
1500
x7679
1133F1
Spanning Tree with Maximum Degree
graphs
1600
x7705
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x11511
1132C
Painting the Fence
brute force
1700
x5393
1131F
Asya And Kittens
constructive algorithms
,
dsu
1700
x6568
1131B
Draw!
greedy
,
implementation
1400
x9684
1130C
Connect
brute force
,
dfs and similar
,
dsu
1400
x8506
1129A1
Toy Train (Simplified)
brute force
,
greedy
1700
x3805
1121C
System Testing
implementation
1600
x1986
1119C
Ramesses and Corner Inversion
constructive algorithms
,
greedy
,
implementation
,
math
1500
x6813
1119B
Alyona and a Narrow Fridge
binary search
,
flows
,
greedy
,
sortings
1300
x10683
1118E
Yet Another Ball Problem
constructive algorithms
,
implementation
1700
x4107
1118D2
Coffee and Coursework (Hard Version)
binary search
,
greedy
1700
x6205
1118D1
Coffee and Coursework (Easy version)
brute force
,
greedy
1700
x5625
1118C
Palindromic Matrix
constructive algorithms
,
implementation
1700
x5728
1115U3
Block unitary
*special problem
1700
x197
1115U2
Chessboard unitary
*special problem
1600
x232
1115U1
Anti-diagonal unitary
*special problem
1500
x254
1115G3
Palindrome checker oracle
*special problem
1600
x229
1115G2
OR oracle
*special problem
1600
x310
1114C
Trailing Loves (or L'oeufs?)
brute force
,
implementation
,
math
,
number theory
1700
x7344
1114B
Yet Another Array Partitioning Task
constructive algorithms
,
greedy
,
sortings
1500
x8922
1113B
Sasha and Magnetic Machines
greedy
,
number theory
1300
x7705
1111C
Creative Snap
binary search
,
brute force
,
divide and conquer
,
math
1700
x6222
1111B
Average Superhero Gang Power
brute force
,
implementation
,
math
1700
x6226
1110C
Meaningless Operations
constructive algorithms
,
math
,
number theory
1500
x9283
1110B
Tape
greedy
,
sortings
1400
x11293
1109A
Sasha and a Bit of Relax
dp
,
implementation
1600
x8454
1108D
Diverse Garland
constructive algorithms
,
dp
,
greedy
1400
x14936
1108C
Nice Garland
brute force
,
greedy
,
math
1300
x11892
1107C
Brutality
greedy
,
sortings
,
two pointers
1300
x9895
1106D
Lunar New Year and a Wander
data structures
,
dfs and similar
,
graphs
,
greedy
,
shortest paths
1500
x14420
1106B
Lunar New Year and Food Ordering
data structures
,
implementation
1500
x6733
1105C
Ayoub and Lost Array
combinatorics
,
dp
,
math
1500
x10286
1103A
Grid game
constructive algorithms
,
implementation
1400
x9714
1102E
Monotonic Renumeration
combinatorics
,
sortings
1700
x5849
1102D
Balanced Ternary String
greedy
,
strings
1500
x7931
1102B
Array K-Coloring
greedy
,
sortings
1400
x10323
1101E
Polycarp's New Job
implementation
1500
x7778
1101C
Division and Union
sortings
1500
x7865
1101B
Accordion
greedy
,
implementation
1300
x10440
1100B
Build a Contest
data structures
,
implementation
1300
x11081
1098A
Sum in the tree
constructive algorithms
,
dfs and similar
,
greedy
,
trees
1600
x8694
1097C
Yuhao and a Parenthesis
greedy
,
implementation
1400
x8417
1096C
Polygon for the Angle
brute force
,
geometry
1600
x6726
1096B
Substring Removal
combinatorics
,
math
,
strings
1300
x10511
1095D
Circular Dance
implementation
1600
x7505
1095C
Powers Of Two
bitmasks
,
greedy
1400
x16518
1093D
Beautiful Graph
dfs and similar
,
graphs
1700
x8841
1093C
Mishka and the Last Exam
greedy
1300
x9330
1092C
Prefixes and Suffixes
strings
1700
x5869
1091D
New Year and the Permutation Concatenation
combinatorics
,
dp
,
math
1700
x6710
1091C
New Year and the Sphere Transmission
math
,
number theory
1400
x9930
1090A
Company Merging
greedy
1300
x4141
1089G
Guest Student
math
1500
x2877
1089E
Easy Chess
constructive algorithms
1700
x1965
1088C
Ehab and a 2-operation task
constructive algorithms
,
greedy
,
math
1400
x8028
1085D
Minimum Diameter Tree
constructive algorithms
,
implementation
,
trees
1700
x5392
1085C
Connect Three
implementation
,
math
1600
x5409
1084C
The Fair Nut and String
combinatorics
,
dp
,
implementation
1500
x7919
1082C
Multi-Subject Competition
greedy
,
sortings
1600
x5680
1082B
Vova and Trophies
greedy
1600
x7475
1081C
Colorful Bricks
combinatorics
,
dp
,
math
1500
x7195
1081B
Farewell Party
constructive algorithms
,
implementation
1500
x4424
1080C
Masha and two friends
implementation
1500
x4012
1077D
Cutting Out
binary search
,
sortings
1600
x8761
1077C
Good Array
1300
x16743
1076C
Meme Problem
binary search
,
math
1300
x12308
1073D
Berland Fair
binary search
,
brute force
,
data structures
,
greedy
1700
x6375
1070H
BerOS File Suggestion
brute force
,
implementation
1500
x3635
1070F
Debate
greedy
1500
x3583
1070D
Garbage Disposal
greedy
1300
x4881
1068C
Colored Rooks
constructive algorithms
,
graphs
1700
x3136
1068A
Birthday
math
1400
x6754
1066E
Binary Numbers AND Sum
data structures
,
implementation
,
math
1700
x6105
1066C
Books Queries
implementation
1400
x9554
1066B
Heaters
greedy
,
two pointers
1500
x8233
1065C
Make It Equal
greedy
1600
x7764
1065B
Vasya and Isolated Vertices
constructive algorithms
,
graphs
1300
x10873
1063A
Oh Those Palindromes
constructive algorithms
,
strings
1300
x10307
1062C
Banh-mi
greedy
,
implementation
,
math
1600
x5381
1062B
Math
greedy
,
math
,
number theory
1500
x8595
1062A
A Prank
greedy
,
implementation
1300
x8754
1061C
Multiplicity
data structures
,
dp
,
implementation
,
math
,
number theory
1700
x8666
1061B
Views Matter
greedy
,
implementation
,
sortings
1400
x7268
1060C
Maximum Subrectangle
binary search
,
implementation
,
two pointers
1600
x4863
1059C
Sequence Transformation
constructive algorithms
,
math
1600
x7085
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