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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
35:58:53
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data structures
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
543E
Listening to Music
constructive algorithms
,
data structures
3200
x276
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x271
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x268
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x262
1007D
Ants
2-sat
,
data structures
,
trees
3200
x256
1830F
The Third Grace
data structures
,
dp
3200
x219
414E
Mashmokh's Designed Problem
data structures
3200
x191
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x189
482E
ELCA
data structures
,
trees
3200
x175
1056H
Detect Robots
data structures
,
strings
3200
x144
730L
Expression Queries
data structures
3200
x83
1599E
Two Arrays
data structures
,
matrices
3200
x66
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x54
576E
Painting Edges
binary search
,
data structures
3300
x1100
1063F
String Journey
data structures
,
dp
,
string suffix structures
3300
x796
1270H
Number of Components
data structures
3300
x575
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x514
1290E
Cartesian Tree
data structures
3300
x509
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x469
1172F
Nauuo and Bug
data structures
3300
x399
671E
Organizing a Race
data structures
,
greedy
3300
x394
639F
Bear and Chemistry
data structures
,
dfs and similar
,
graphs
,
trees
3300
x394
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x368
768G
The Winds of Winter
binary search
,
data structures
3300
x353
1408H
Rainbow Triples
binary search
,
data structures
,
flows
,
greedy
3300
x351
1558F
Strange Sort
data structures
,
sortings
3300
x349
983D
Arkady and Rectangles
data structures
3300
x320
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x313
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x306
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x295
1322E
Median Mountain Range
data structures
3300
x293
1172E
Nauuo and ODT
data structures
3300
x287
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x286
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x282
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x280
704E
Iron Man
data structures
,
geometry
,
trees
3300
x272
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x265
1083F
The Fair Nut and Amusing Xor
data structures
3300
x265
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x216
1500E
Subset Trick
binary search
,
data structures
3300
x210
1870G
MEXanization
data structures
3300
x201
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x201
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x197
1886F
Diamond Theft
data structures
,
greedy
3300
x158
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x145
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x135
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x117
1491H
Yuezheng Ling and Dynamic Tree
data structures
,
trees
3400
x759
1119F
Niyaz and Small Degrees
data structures
,
dp
,
trees
3400
x647
757G
Can Bash Save the Day?
data structures
,
divide and conquer
,
graphs
,
trees
3400
x478
1137F
Matches Are Not a Child's Play
data structures
,
trees
3400
x456
1482H
Exam
data structures
,
string suffix structures
,
trees
3400
x422
1693E
Outermost Maximums
data structures
,
greedy
3400
x369
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x337
1548E
Gregor and the Two Painters
data structures
,
divide and conquer
,
graphs
,
greedy
,
math
3400
x336
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x313
1039E
Summer Oenothera Exhibition
data structures
3400
x263
1572F
Stations
data structures
3400
x236
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x224
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x210
936E
Iqea
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
shortest paths
,
trees
3400
x182
1466I
The Riddle of the Sphinx
binary search
,
data structures
,
data structures
,
interactive
3400
x180
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x174
1764H
Doremy's Paint 2
data structures
3400
x162
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x157
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
1530H
Turing's Award
data structures
,
dp
3400
x140
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1060G
Balls and Pockets
data structures
3400
x134
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x129
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x121
1023G
Pisces
data structures
,
flows
,
trees
3400
x113
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x64
853E
Lada Malina
data structures
,
geometry
3400
x64
1707E
Replace
binary search
,
data structures
3500
x557
1034D
Intervals of Intervals
binary search
,
data structures
,
two pointers
3500
x431
799F
Beautiful fountains rows
data structures
3500
x417
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x300
1464F
My Beautiful Madness
data structures
,
trees
3500
x273
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x266
1458F
Range Diameter Sum
data structures
,
trees
3500
x258
1148H
Holy Diver
data structures
3500
x238
1523H
Hopping Around the Array
data structures
,
dp
3500
x234
1830E
Bully Sort
data structures
,
math
3500
x225
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x225
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x214
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x211
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x194
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
1423G
Growing flowers
data structures
3500
x177
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1685E
The Ultimate LIS Problem
data structures
,
greedy
3500
x141
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x141
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x133
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x127
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x124
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x119
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