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Name
1648E
Air Reform
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
implementation
,
trees
3200
x384
1648D
Serious Business
data structures
,
divide and conquer
,
dp
,
implementation
,
shortest paths
2800
x800
1648C
Tyler and Strings
combinatorics
,
data structures
,
implementation
1900
x2870
1648B
Integral Array
brute force
,
constructive algorithms
,
data structures
,
math
1800
x6200
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11824
1647E
Madoka and the Sixth-graders
data structures
,
dfs and similar
,
greedy
2500
x956
1644E
Expand the Path
brute force
,
combinatorics
,
data structures
,
implementation
,
math
1900
x3008
1644D
Cross Coloring
data structures
,
implementation
,
math
1700
x7005
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2333
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x190
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1795
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4052
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14388
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20428
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x300
1635F
Closest Pair
data structures
,
greedy
2800
x980
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1529
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1598
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x308
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1459
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1111
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4478
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5517
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x830
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2247
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10631
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x580
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x977
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1971
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1078
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20567
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x110
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x623
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x533
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1715
1621B
Integers Shop
data structures
,
greedy
,
implementation
1500
x13122
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7800
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1075
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8724
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1482
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x796
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2389
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x308
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1406
1614E
Divan and a Cottage
binary search
,
data structures
2600
x809
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x607
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6217
1610H
Squid Game
data structures
,
dfs and similar
,
greedy
,
trees
3100
x422
1610G
AmShZ Wins a Bet
data structures
,
greedy
,
hashing
3300
x376
1609G
A Stroll Around the Matrix
data structures
,
greedy
,
math
3000
x363
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x732
1609E
William The Oblivious
bitmasks
,
data structures
,
dp
,
matrices
2400
x1872
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x150
1608C
Game Master
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
two pointers
1700
x6424
1601E
Phys Ed Online
data structures
,
dp
,
greedy
2900
x464
1601D
Difficult Mountain
data structures
,
dp
,
greedy
,
sortings
2700
x1383
1601C
Optimal Insertion
data structures
,
divide and conquer
,
dp
,
greedy
,
sortings
2300
x1920
1601B
Frog Traveler
data structures
,
dfs and similar
,
dp
,
graphs
,
shortest paths
,
two pointers
1900
x4788
1599I
Desert
data structures
,
graphs
2700
x112
1599E
Two Arrays
data structures
,
matrices
3200
x66
1598F
RBS
binary search
,
bitmasks
,
brute force
,
data structures
,
dp
2400
x1324
1598E
Staircases
brute force
,
combinatorics
,
data structures
,
dfs and similar
,
dp
,
implementation
,
math
2100
x2243
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8418
1598C
Delete Two Elements
data structures
,
dp
,
implementation
,
math
,
two pointers
1200
x20108
1593G
Changing Brackets
constructive algorithms
,
data structures
,
dp
,
greedy
2200
x1622
1593E
Gardener and Tree
brute force
,
data structures
,
dfs and similar
,
greedy
,
implementation
,
trees
1600
x11734
1588F
Jumping Through the Array
binary search
,
data structures
,
graphs
,
two pointers
3500
x269
1585E
Frequency Queries
data structures
,
dfs and similar
,
trees
2400
x1018
1585D
Yet Another Sorting Problem
data structures
,
math
1900
x3636
1584E
Game with Stones
binary search
,
data structures
,
games
,
greedy
2300
x1221
1583H
Omkar and Tours
data structures
,
divide and conquer
,
sortings
,
trees
3300
x314
1583G
Omkar and Time Travel
data structures
,
math
3000
x401
1583C
Omkar and Determination
data structures
,
dp
1700
x6816
1582G
Kuzya and Homework
data structures
,
number theory
2600
x561
1582E
Pchelyonok and Segments
binary search
,
data structures
,
dp
,
greedy
,
math
2000
x3598
1582C
Grandma Capa Knits a Scarf
brute force
,
data structures
,
greedy
,
strings
,
two pointers
1200
x14504
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x64
1580C
Train Maintenance
brute force
,
data structures
,
implementation
2200
x1678
1580A
Portal
brute force
,
data structures
,
dp
,
greedy
,
implementation
1700
x3567
1579E2
Array Optimization by Deque
data structures
,
greedy
1700
x6370
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x217
1578B
Building Forest Trails
data structures
,
dsu
2800
x321
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x239
1575L
Longest Array Deconstruction
data structures
,
divide and conquer
,
dp
,
sortings
2100
x1280
1575I
Illusions of the Desert
data structures
,
trees
2300
x843
1575E
Eye-Pleasing City Park Tour
data structures
,
trees
2600
x303
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x155
1575A
Another Sorting Problem
data structures
,
sortings
,
strings
1100
x4229
1574D
The Strongest Build
binary search
,
brute force
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
hashing
,
implementation
2000
x4363
1572F
Stations
data structures
3400
x240
1572A
Book
binary search
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
1800
x8560
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x54
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x71
1569D
Inconvenient Pairs
binary search
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x4293
1567E
Non-Decreasing Dilemma
data structures
,
divide and conquer
,
math
2200
x3511
1566G
Four Vertices
constructive algorithms
,
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
3100
x329
1566F
Points Movement
data structures
,
dp
,
greedy
,
implementation
,
sortings
2600
x928
1566D2
Seating Arrangements (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
two pointers
1600
x7704
1566D1
Seating Arrangements (easy version)
data structures
,
greedy
,
sortings
1100
x13787
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