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Rayan
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Before contest
Educational Codeforces Round 173 (Rated for Div. 2)
38:40:14
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Difficulty:
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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
1163B1
Cat Party (Easy Edition)
data structures
,
implementation
1500
x7025
1163A
Eating Soup
greedy
,
math
900
x13091
1162B
Double Matrix
brute force
,
greedy
1400
x5831
1162A
Zoning Restrictions Again
implementation
800
x8321
1160A2
Collaboration
*special problem
1159B
Expansion coefficient of the array
implementation
,
math
1300
x7107
1159A
A pile of stones
implementation
,
math
800
x12794
1158F
Density of subarrays
dp
,
math
3500
x417
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x152
1158D
Winding polygonal line
constructive algorithms
,
geometry
,
greedy
,
math
2600
x843
1158C
Permutation recovery
constructive algorithms
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
math
,
sortings
2100
x1965
1158B
The minimal unique substring
constructive algorithms
,
math
,
strings
2200
x2253
1158A
The Party and Sweets
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
1500
x7271
1157G
Inverse of Rows and Columns
brute force
,
constructive algorithms
2200
x930
1157F
Maximum Balanced Circle
constructive algorithms
,
dp
,
greedy
,
two pointers
2000
x2687
1157E
Minimum Array
binary search
,
data structures
,
greedy
1700
x8498
1157D
N Problems During K Days
constructive algorithms
,
greedy
,
math
1900
x3793
1157C2
Increasing Subsequence (hard version)
greedy
1700
x8143
1157C1
Increasing Subsequence (easy version)
greedy
1300
x12749
1157B
Long Number
greedy
1300
x14840
1157A
Reachable Numbers
implementation
1100
x15792
1156G
Optimizer
graphs
,
greedy
,
hashing
,
implementation
2700
x132
1156F
Card Bag
dp
,
math
,
probabilities
2300
x1490
1156E
Special Segments of Permutation
data structures
,
divide and conquer
,
dsu
,
two pointers
2200
x3149
1156D
0-1-Tree
dfs and similar
,
divide and conquer
,
dp
,
dsu
,
trees
2200
x3998
1156C
Match Points
binary search
,
greedy
,
sortings
,
ternary search
,
two pointers
2000
x6180
1156B
Ugly Pairs
dfs and similar
,
greedy
,
implementation
,
sortings
,
strings
1800
x6253
1156A
Inscribed Figures
geometry
1400
x8267
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x420
1155E
Guess the Root
brute force
,
interactive
,
math
2200
x1447
1155D
Beautiful Array
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
1900
x7011
1155C
Alarm Clocks Everywhere
math
,
number theory
1300
x9272
1155B
Game with Telephone Numbers
games
,
greedy
,
implementation
1200
x11963
1155A
Reverse a Substring
implementation
,
sortings
,
strings
1000
x15675
1154G
Minimum Possible LCM
brute force
,
greedy
,
math
,
number theory
2200
x2831
1154F
Shovels Shop
dp
,
greedy
,
sortings
2100
x2892
1154E
Two Teams
data structures
,
implementation
,
sortings
1800
x6388
1154D
Walking Robot
greedy
1500
x10053
1154C
Gourmet Cat
implementation
,
math
1400
x10483
1154B
Make Them Equal
math
1200
x16769
1154A
Restoring Three Numbers
math
800
x73016
1153F
Serval and Bonus Problem
combinatorics
,
dp
,
math
,
probabilities
2600
x820
1153E
Serval and Snake
binary search
,
brute force
,
interactive
2200
x1513
1153D
Serval and Rooted Tree
binary search
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5046
1153C
Serval and Parenthesis Sequence
greedy
,
strings
1700
x7447
1153B
Serval and Toy Bricks
constructive algorithms
,
greedy
1200
x9105
1153A
Serval and Bus
brute force
,
math
1000
x11568
1152F2
Neko Rules the Catniverse (Large Version)
bitmasks
,
dp
,
matrices
3000
x680
1152F1
Neko Rules the Catniverse (Small Version)
bitmasks
,
dp
,
matrices
2800
x581
1152E
Neko and Flashback
constructive algorithms
,
dfs and similar
,
graphs
2400
x1001
1152D
Neko and Aki's Prank
dp
,
greedy
,
trees
2100
x2437
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6725
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8974
1152A
Neko Finds Grapes
greedy
,
implementation
,
math
800
x15379
1151F
Sonya and Informatics
combinatorics
,
dp
,
matrices
,
probabilities
2300
x1251
1151E
Number of Components
combinatorics
,
data structures
,
dp
,
math
2100
x3365
1151D
Stas and the Queue at the Buffet
greedy
,
math
,
sortings
1600
x8490
1151C
Problem for Nazar
constructive algorithms
,
math
1800
x5381
1151B
Dima and a Bad XOR
bitmasks
,
brute force
,
constructive algorithms
,
dp
1600
x11446
1151A
Maxim and Biology
brute force
,
strings
1000
x11270
1150B
Tiling Challenge
greedy
,
implementation
900
x11362
1150A
Stock Arbitraging
greedy
,
implementation
800
x11912
1149E
Election Promises
games
,
graphs
3200
x536
1149D
Abandoning Roads
brute force
,
dp
,
graphs
,
greedy
3000
x796
1149C
Tree Generator™
data structures
,
implementation
,
trees
2700
x1314
1149B
Three Religions
dp
,
implementation
,
strings
2200
x1911
1149A
Prefix Sum Primes
constructive algorithms
,
greedy
,
math
,
number theory
1200
x15470
1148H
Holy Diver
data structures
3500
x268
1148G
Gold Experience
constructive algorithms
,
graphs
,
math
,
number theory
,
probabilities
3300
x337
1148F
Foo Fighters
bitmasks
,
constructive algorithms
2700
x1048
1148E
Earth Wind and Fire
constructive algorithms
,
greedy
,
math
,
sortings
,
two pointers
2300
x1689
1148D
Dirty Deeds Done Dirt Cheap
greedy
,
sortings
1800
x5011
1148C
Crazy Diamond
constructive algorithms
,
sortings
1700
x5328
1148B
Born This Way
binary search
,
brute force
,
two pointers
1600
x7546
1148A
Another One Bites The Dust
greedy
800
x14980
1147F
Zigzag Game
games
,
interactive
3500
x265
1147E
Rainbow Coins
interactive
3000
x344
1147D
Palindrome XOR
dfs and similar
,
graphs
2400
x759
1147C
Thanos Nim
games
2000
x3311
1147B
Chladni Figure
brute force
,
strings
1900
x2902
1147A
Hide and Seek
graphs
1500
x5290
1146H
Satanic Panic
dp
,
geometry
2900
x610
1146G
Zoning Restrictions
dp
,
flows
,
graphs
2700
x857
1146F
Leaf Partition
dp
,
trees
2500
x1194
1146E
Hot is Cold
bitmasks
,
data structures
,
divide and conquer
,
implementation
2400
x936
1146D
Frog Jumping
dfs and similar
,
math
,
number theory
2100
x1110
1146C
Tree Diameter
bitmasks
,
graphs
,
interactive
1700
x3742
1146B
Hate "A"
implementation
,
strings
1100
x8652
1146A
Love "A"
implementation
,
strings
800
x22164
1145G
AI Takeover
interactive
x177
1145F
Neat Words
x515
1145E
Fourier Doodles
x430
1145D
Pigeon d'Or
implementation
x1166
1145C
Mystery Circuit
bitmasks
,
brute force
x808
1145B
Kanban Numbers
brute force
x1463
1145A
Thanos Sort
implementation
x8701
1144G
Two Merged Sequences
dp
,
greedy
2400
x2024
1144F
Graph Without Long Directed Paths
dfs and similar
,
graphs
1700
x11869
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x4196
1144D
Equalize Them All
constructive algorithms
,
greedy
1400
x10381
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