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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
34:03:44
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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
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x192
1336F
Journey
data structures
,
divide and conquer
,
graphs
,
trees
3500
x193
1488E
Palindromic Doubles
*special problem
,
data structures
,
dp
2200
x194
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x195
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x196
1468B
Bakery
data structures
,
dsu
2900
x196
862F
Mahmoud and Ehab and the final stage
data structures
,
strings
2900
x196
792F
Mages and Monsters
data structures
,
geometry
3100
x198
1870G
MEXanization
data structures
3300
x199
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x199
403E
Two Rooted Trees
data structures
,
implementation
,
trees
2900
x200
1928F
Digital Patterns
combinatorics
,
data structures
,
implementation
,
math
2900
x202
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x204
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x207
1500E
Subset Trick
binary search
,
data structures
3300
x209
833E
Caramel Clouds
data structures
,
dp
,
sortings
3400
x209
392D
Three Arrays
data structures
x210
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x213
1439E
Cheat and Win
bitmasks
,
data structures
,
games
,
trees
3500
x213
1735F
Pebbles and Beads
data structures
,
geometry
2900
x214
1043G
Speckled Band
data structures
,
divide and conquer
,
hashing
,
string suffix structures
,
strings
3500
x214
533D
Landmarks
data structures
,
dp
3000
x214
1930G
Prefix Max Set Counting
data structures
,
dp
,
trees
3100
x215
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x216
774B
Significant Cups
*special problem
,
binary search
,
data structures
,
two pointers
2100
x216
1830F
The Third Grace
data structures
,
dp
3200
x217
1346F
Dune II: Battle For Arrakis
*special problem
,
data structures
,
greedy
,
math
2000
x218
720D
Slalom
data structures
,
dp
,
sortings
3100
x221
648D
Собачки и миски
data structures
,
greedy
,
sortings
1900
x221
1515I
Phoenix and Diamonds
binary search
,
data structures
,
sortings
3400
x222
1830E
Bully Sort
data structures
,
math
3500
x223
1083D
The Fair Nut's getting crazy
data structures
,
implementation
3500
x223
475F
Meta-universe
data structures
2900
x224
1738H
Palindrome Addicts
data structures
,
strings
3300
x226
1425I
Impressive Harvesting of The Orchard
data structures
2800
x226
883L
Berland.Taxi
data structures
2500
x226
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x232
1523H
Hopping Around the Array
data structures
,
dp
3500
x233
1572F
Stations
data structures
3400
x235
1148H
Holy Diver
data structures
3500
x236
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x236
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x237
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x241
1109C
Sasha and a Patient Friend
binary search
,
data structures
,
implementation
2800
x242
238D
Tape Programming
data structures
,
implementation
2900
x243
1767F
Two Subtrees
data structures
,
trees
3100
x244
1120F
Secret Letters
data structures
,
dp
,
greedy
3100
x247
1900F
Local Deletions
binary search
,
data structures
,
implementation
2800
x252
960H
Santa's Gift
data structures
,
trees
3100
x252
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x252
1007D
Ants
2-sat
,
data structures
,
trees
3200
x254
1458F
Range Diameter Sum
data structures
,
trees
3500
x257
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x259
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x262
1039E
Summer Oenothera Exhibition
data structures
3400
x262
981H
K Paths
combinatorics
,
data structures
,
dp
,
fft
,
math
3100
x262
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x263
1083F
The Fair Nut and Amusing Xor
data structures
3300
x264
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x266
1344E
Train Tracks
data structures
,
trees
3100
x266
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x267
1416E
Split
binary search
,
data structures
,
dp
,
greedy
3200
x267
1533E
Chess Team Forming
*special problem
,
binary search
,
data structures
,
greedy
x268
1464F
My Beautiful Madness
data structures
,
trees
3500
x270
704E
Iron Man
data structures
,
geometry
,
trees
3300
x271
1495F
Squares
constructive algorithms
,
data structures
,
dp
,
graphs
,
trees
3300
x274
543E
Listening to Music
constructive algorithms
,
data structures
3200
x275
257E
Greedy Elevator
data structures
,
implementation
2200
x275
1214G
Feeling Good
bitmasks
,
data structures
3200
x277
1109F
Sasha and Algorithm of Silence's Sounds
data structures
,
trees
3200
x277
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x278
1332G
No Monotone Triples
data structures
3100
x281
1913F
Palindromic Problem
binary search
,
data structures
,
hashing
,
string suffix structures
,
strings
2800
x283
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x283
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x284
1172E
Nauuo and ODT
data structures
3300
x284
717F
Heroes of Making Magic III
data structures
2600
x284
1718D
Permutation for Burenka
data structures
,
graph matchings
,
greedy
,
math
,
trees
3300
x285
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x289
418E
Tricky Password
data structures
3100
x289
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x289
380E
Sereja and Dividing
data structures
2600
x291
1322E
Median Mountain Range
data structures
3300
x292
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x294
494E
Sharti
data structures
,
games
3200
x295
274E
Mirror Room
data structures
,
implementation
3000
x298
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x299
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x299
1712F
Triameter
binary search
,
data structures
,
dfs and similar
,
trees
3200
x300
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x300
1427F
Boring Card Game
data structures
,
greedy
,
trees
3200
x300
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x301
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x303
1284F
New Year and Social Network
data structures
,
graph matchings
,
graphs
,
math
,
trees
3200
x305
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x306
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x306
793G
Oleg and chess
data structures
,
divide and conquer
,
flows
,
graph matchings
3400
x311
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x312
1045A
Last chance
data structures
,
flows
,
graph matchings
,
graphs
,
trees
2500
x313
773E
Blog Post Rating
data structures
,
sortings
3000
x315
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