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Problems
#
Name
1641F
Covering Circle
geometry
3500
x94
1641E
Special Positions
combinatorics
,
divide and conquer
,
fft
,
math
3300
x203
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1043
1641C
Anonymity Is Important
binary search
,
brute force
,
data structures
,
dsu
,
greedy
,
sortings
2200
x2322
1641B
Repetitions Decoding
constructive algorithms
,
implementation
,
sortings
2000
x3724
1641A
Great Sequence
brute force
,
greedy
,
sortings
1200
x17489
1639K
Treasure Hunt
graphs
,
interactive
1639J
Treasure Hunt
graphs
,
interactive
1639I
Treasure Hunt
graphs
,
interactive
1639H
Treasure Hunt
graphs
,
interactive
1639G
Treasure Hunt
graphs
,
interactive
1639F
Treasure Hunt
graphs
,
interactive
1639E
Treasure Hunt
graphs
,
interactive
1639D
Treasure Hunt
graphs
,
interactive
1639C
Treasure Hunt
graphs
,
interactive
1639B
Treasure Hunt
graphs
,
interactive
1639A
Treasure Hunt
graphs
,
interactive
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x189
1638E
Colorful Operations
brute force
,
data structures
,
implementation
2400
x1791
1638D
Big Brush
constructive algorithms
,
data structures
,
greedy
,
implementation
2000
x4033
1638C
Inversion Graph
data structures
,
dsu
,
graphs
,
math
1300
x14343
1638B
Odd Swap Sort
data structures
,
math
,
sortings
1100
x20384
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x21210
1637H
Minimize Inversions Number
data structures
,
greedy
,
math
,
sortings
3500
x300
1637G
Birthday
constructive algorithms
,
greedy
,
math
3000
x452
1637F
Towers
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
trees
2500
x1690
1637E
Best Pair
binary search
,
brute force
,
implementation
2100
x3182
1637D
Yet Another Minimization Problem
dp
,
greedy
,
math
1800
x7352
1637C
Andrew and Stones
greedy
,
implementation
1200
x17317
1637B
MEX and Array
brute force
,
dp
,
greedy
,
math
1100
x14609
1637A
Sorting Parts
brute force
,
sortings
800
x22060
1635F
Closest Pair
data structures
,
greedy
2800
x980
1635E
Cars
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
sortings
2200
x2161
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5989
1635C
Differential Sorting
constructive algorithms
,
greedy
1200
x16323
1635B
Avoid Local Maximums
greedy
800
x17789
1635A
Min Or Sum
bitmasks
,
greedy
800
x22051
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1524
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1597
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4221
1634C
OKEA
constructive algorithms
1000
x17924
1634B
Fortune Telling
bitmasks
,
math
1400
x15614
1634A
Reverse and Concatenate
greedy
,
strings
800
x23633
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x306
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1455
1633D
Make Them Equal
dp
,
greedy
1600
x12966
1633C
Kill the Monster
brute force
,
math
1100
x19596
1633B
Minority
greedy
800
x27197
1633A
Div. 7
brute force
800
x31831
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x926
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1108
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4456
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12227
1632B
Roof Construction
bitmasks
,
constructive algorithms
1000
x20787
1632A
ABC
implementation
800
x28889
1631B
Fun with Even Subarrays
dp
,
greedy
1100
x19265
1631A
Min Max Swap
greedy
800
x28625
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x491
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x422
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1507
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2829
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5494
1630A
And Matching
bitmasks
,
constructive algorithms
1500
x14047
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x22950
1629A
Download More RAM
brute force
,
greedy
,
sortings
800
x28533
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x826
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x1977
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3013
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3074
1628B
Peculiar Movie Preferences
greedy
,
strings
1700
x11175
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15179
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x553
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2225
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7809
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x14015
1627B
Not Sitting
games
,
greedy
,
sortings
1300
x16252
1627A
Not Shading
constructive algorithms
,
implementation
800
x23782
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x702
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1518
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3786
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10597
1626B
Minor Reduction
greedy
,
strings
1100
x22303
1626A
Equidistant Letters
constructive algorithms
,
sortings
800
x28317
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x576
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x973
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1964
1625C
Road Optimization
dp
1700
x10029
1625B
Elementary Particles
brute force
,
greedy
,
sortings
1100
x15849
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x16937
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5522
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3170
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3934
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x16219
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x23983
1624B
Make AP
implementation
,
math
900
x34133
1624A
Plus One on the Subset
math
800
x49668
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1074
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1349
1623C
Balanced Stone Heaps
binary search
,
greedy
1600
x11292
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