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Problems
#
Name
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11581
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x14769
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x17403
1844A
Subtraction Game
constructive algorithms
,
games
800
x23808
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1465
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4959
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10905
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x16965
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30966
1843B
Long Long
greedy
,
math
,
two pointers
800
x27943
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32874
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x107
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x556
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x917
1842F
Tenzing and Tree
dfs and similar
,
greedy
,
shortest paths
,
sortings
,
trees
2500
x1239
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1526
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3907
1842C
Tenzing and Balls
dp
1500
x11572
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15564
1842A
Tenzing and Tsondu
games
,
math
800
x19421
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x469
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x1874
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4116
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7278
1841B
Keep it Beautiful
implementation
1000
x20449
1841A
Game with Board
constructive algorithms
,
games
800
x24174
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x893
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2214
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1693
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7494
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x12710
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24430
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21417
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32438
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1143
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2167
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11336
1839B
Lamps
greedy
,
sortings
1100
x14447
1839A
The Good Array
greedy
,
implementation
,
math
800
x17064
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x291
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1359
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3067
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13392
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x15795
1838A
Blackboard List
constructive algorithms
,
math
800
x21030
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2057
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2091
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13258
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21062
1837B
Comparison String
greedy
900
x26384
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x28956
1836B
Astrophysicists
greedy
,
math
1100
x12250
1836A
Destroyer
implementation
,
sortings
800
x19753
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x137
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x201
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x444
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x934
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x896
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7408
1834F
Typewriter
brute force
,
math
2500
x488
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2043
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4336
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12587
1834B
Maximum Strength
greedy
,
math
1000
x14485
1834A
Unit Array
greedy
,
math
800
x21027
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4913
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6624
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10204
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12642
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25464
1833B
Restore the Weather
greedy
,
sortings
900
x25306
1833A
Musical Puzzle
implementation
,
strings
800
x31480
1832F
Zombies
binary search
,
dp
3200
x250
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2054
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1785
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2783
1832C
Contrast Value
greedy
,
implementation
1200
x18129
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19516
1832A
New Palindrome
strings
800
x24732
1831B
Array merging
constructive algorithms
,
greedy
1000
x18382
1831A
Twin Permutations
constructive algorithms
800
x24055
1830F
The Third Grace
data structures
,
dp
3200
x219
1830E
Bully Sort
data structures
,
math
3500
x225
1830D
Mex Tree
brute force
,
dp
,
trees
2800
x597
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1514
1830B
The BOSS Can Count Pairs
brute force
,
math
2000
x4580
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12373
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7010
1829G
Hits Different
data structures
,
dp
,
implementation
,
math
1600
x9332
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x16064
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x18103
1829D
Gold Rush
brute force
,
dfs and similar
,
dp
,
implementation
1000
x24061
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x26984
1829B
Blank Space
implementation
800
x40482
1829A
Love Story
implementation
,
strings
800
x45579
1828B
Permutation Swap
math
,
number theory
900
x20528
1828A
Divisible Array
constructive algorithms
,
math
800
x22857
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x106
1827E
Bus Routes
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
3400
x357
1827D
Two Centroids
data structures
,
dfs and similar
,
greedy
,
trees
2800
x696
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