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Educational Codeforces Round 165 (Rated for Div. 2)
20:39:45
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Difficulty:
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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
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x242
1148H
Holy Diver
data structures
3500
x238
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x238
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x237
1572F
Stations
data structures
3400
x236
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x235
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x235
1523H
Hopping Around the Array
data structures
,
dp
3500
x234
1738H
Palindrome Addicts
data structures
,
strings
3300
x227
1425I
Impressive Harvesting of The Orchard
data structures
2800
x227
883L
Berland.Taxi
data structures
2500
x227
1830E
Bully Sort
data structures
,
math
3500
x225
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x225
475F
Meta-universe
data structures
2900
x225
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x224
720D
Slalom
data structures
,
dp
,
sortings
3100
x222
648D
Собачки и миски
data structures
,
greedy
,
sortings
1900
x221
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
x220
1830F
The Third Grace
data structures
,
dp
3200
x219
1735F
Pebbles and Beads
data structures
,
geometry
2900
x218
1346F
Dune II: Battle For Arrakis
*special problem
,
data structures
,
greedy
,
math
2000
x218
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x217
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x216
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x216
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x215
533D
Landmarks
data structures
,
dp
3000
x215
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x214
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x211
1500E
Subset Trick
binary search
,
data structures
3300
x211
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x210
392D
Three Arrays
data structures
x210
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x208
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x207
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x204
1870G
MEXanization
data structures
3300
x201
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x201
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x201
1468B
Bakery
data structures
,
dsu
2900
x200
792F
Mages and Monsters
data structures
,
geometry
3100
x200
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x197
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x197
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x196
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x194
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x193
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x192
414E
Mashmokh's Designed Problem
data structures
3200
x191
167D
Wizards and Roads
data structures
,
divide and conquer
,
graph matchings
,
graphs
,
greedy
3000
x190
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x189
1499G
Graph Coloring
data structures
,
graphs
,
interactive
3100
x186
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
1423G
Growing flowers
data structures
3500
x178
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x178
391D2
Supercollider
data structures
x177
482E
ELCA
data structures
,
trees
3200
x175
741E
Arpa’s abnormal DNA and Mehrdad’s deep interest
data structures
,
string suffix structures
3400
x174
243E
Matrix
data structures
3000
x171
796F
Sequence Recovery
bitmasks
,
data structures
,
greedy
2800
x169
1895G
Two Characters, Two Colors
binary search
,
data structures
,
dp
,
flows
,
greedy
3100
x168
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x168
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x167
1764H
Doremy's Paint 2
data structures
3400
x164
1045J
Moonwalk challenge
data structures
,
strings
,
trees
2600
x162
1886F
Diamond Theft
data structures
,
greedy
3300
x158
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x157
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x154
1758F
Decent Division
constructive algorithms
,
data structures
3000
x153
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x147
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x145
1056H
Detect Robots
data structures
,
strings
3200
x144
720F
Array Covering
data structures
3100
x143
1685E
The Ultimate LIS Problem
data structures
,
greedy
3500
x141
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x141
1530H
Turing's Award
data structures
,
dp
3400
x140
1672I
PermutationForces
data structures
,
greedy
3000
x137
786D
Rap God
data structures
,
dfs and similar
,
hashing
,
strings
,
trees
3400
x136
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x135
1060G
Balls and Pockets
data structures
3400
x134
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x133
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
477E
Dreamoon and Notepad
data structures
3100
x131
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x130
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x127
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x125
542B
Duck Hunt
data structures
3100
x125
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x124
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x123
917E
Upside Down
data structures
,
string suffix structures
,
strings
,
trees
3400
x121
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x119
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x118
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x117
1477E
Nezzar and Tournaments
data structures
,
greedy
3300
x117
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x116
1508F
Optimal Encoding
brute force
,
data structures
3500
x116
1866F
Freak Joker Process
binary search
,
data structures
,
sortings
3100
x113
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x113
1023G
Pisces
data structures
,
flows
,
trees
3400
x113
1599I
Desert
data structures
,
graphs
2700
x112
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