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Codeforces Round 950 (Div. 3)
43:22:11
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data structures
combine-tags-by-or
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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
1654E
Arithmetic Operations
brute force
,
data structures
,
graphs
,
math
2300
x2001
1654C
Alice and the Cake
data structures
,
greedy
,
implementation
,
sortings
1400
x13210
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x364
1651D
Nearest Excluded Points
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4860
1651C
Fault-tolerant Network
brute force
,
data structures
,
implementation
1500
x10515
1650G
Counting Shortcuts
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2348
1650E
Rescheduling the Exam
binary search
,
data structures
,
greedy
,
implementation
,
math
,
sortings
1900
x4031
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x105
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x387
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x808
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2875
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6229
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11920
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x957
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3013
1644D
Cross Coloring
data structures
,
implementation
,
math
1700
x7018
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2345
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x196
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1797
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4062
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14414
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20454
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x301
1635F
Closest Pair
data structures
,
greedy
2800
x981
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1533
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1605
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x311
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1462
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1112
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4497
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5535
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x85
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x835
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2255
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10673
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x583
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x981
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1976
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1079
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20598
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x111
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x626
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x539
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1726
1621B
Integers Shop
data structures
,
greedy
,
implementation
1500
x13147
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7856
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1079
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8745
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1488
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x803
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2395
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x310
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1408
1614E
Divan and a Cottage
binary search
,
data structures
2600
x812
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x609
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6235
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x433
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x377
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x364
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x734
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1885
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x151
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6448
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x467
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1394
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1929
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4798
1599I
Desert
data structures
,
graphs
2700
x113
1599E
Two Arrays
data structures
,
matrices
3200
x67
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1331
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2251
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8438
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20160
1593G
Changing Brackets
constructive algorithms
,
data structures
,
dp
,
greedy
2200
x1626
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x11778
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x272
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1020
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3648
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1228
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x317
1583G
Omkar and Time Travel
data structures
,
math
3000
x404
1583C
Omkar and Determination
data structures
,
dp
1700
x6836
1582G
Kuzya and Homework
data structures
,
number theory
2600
x563
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3608
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14614
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x66
1580C
Train Maintenance
brute force
,
data structures
,
implementation
2200
x1686
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3575
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6384
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x221
1578B
Building Forest Trails
data structures
,
dsu
2800
x322
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x240
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1288
1575I
Illusions of the Desert
data structures
,
trees
2300
x846
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x316
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x156
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4236
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4374
1572F
Stations
data structures
3400
x241
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8581
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