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Problems
#
Name
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x315
1847D
Professor Higashikata
data structures
,
dsu
,
greedy
,
implementation
,
strings
1900
x3596
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12196
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19065
1847A
The Man who became a God
greedy
,
sortings
800
x21648
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4035
1846F
Rudolph and Mimic
constructive algorithms
,
implementation
,
interactive
1800
x2866
1846E2
Rudolf and Snowflakes (hard version)
binary search
,
brute force
,
implementation
,
math
1800
x6568
1846E1
Rudolf and Snowflakes (simple version)
brute force
,
implementation
,
math
1300
x15313
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x18286
1846C
Rudolf and the Another Competition
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1200
x17910
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x26019
1846A
Rudolph and Cut the Rope
implementation
,
math
800
x31341
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x352
1845E
Boxes and Balls
dp
,
implementation
,
math
2500
x1259
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7295
1845C
Strong Password
binary search
,
dp
,
greedy
,
strings
1400
x13299
1845B
Come Together
geometry
,
implementation
,
math
900
x20837
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24495
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x130
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x638
1844F2
Min Cost Permutation (Hard Version)
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
,
sortings
2800
x368
1844F1
Min Cost Permutation (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
math
2600
x737
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1683
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11595
1844C
Particles
dp
,
greedy
,
implementation
,
math
1300
x14792
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x17421
1844A
Subtraction Game
constructive algorithms
,
games
800
x23842
1843F2
Omsk Metro (hard version)
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
math
,
trees
2300
x1466
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4966
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10935
1843D
Apple Tree
combinatorics
,
dfs and similar
,
dp
,
math
,
trees
1200
x17002
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31020
1843B
Long Long
greedy
,
math
,
two pointers
800
x27988
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32919
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x108
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x559
1842G
Tenzing and Random Operations
combinatorics
,
dp
,
math
,
probabilities
2800
x921
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
x1531
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3916
1842C
Tenzing and Balls
dp
1500
x11621
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15601
1842A
Tenzing and Tsondu
games
,
math
800
x19433
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x470
1841E
Fill the Matrix
data structures
,
greedy
,
math
2200
x1877
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4122
1841C
Ranom Numbers
brute force
,
dp
,
greedy
,
math
,
strings
1800
x7289
1841B
Keep it Beautiful
implementation
1000
x20473
1841A
Game with Board
constructive algorithms
,
games
800
x24196
1840G2
In Search of Truth (Hard Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2500
x894
1840G1
In Search of Truth (Easy Version)
constructive algorithms
,
interactive
,
math
,
meet-in-the-middle
,
probabilities
2200
x2218
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1696
1840E
Character Blocking
data structures
,
hashing
,
implementation
1600
x7518
1840D
Wooden Toy Festival
binary search
,
greedy
,
sortings
1400
x12805
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24518
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21477
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32512
1839E
Decreasing Game
constructive algorithms
,
dfs and similar
,
dp
,
greedy
,
interactive
2400
x1155
1839D
Ball Sorting
data structures
,
dp
,
sortings
2100
x2171
1839C
Insert Zero and Invert Prefix
constructive algorithms
1300
x11347
1839B
Lamps
greedy
,
sortings
1100
x14458
1839A
The Good Array
greedy
,
implementation
,
math
800
x17075
1838F
Stuck Conveyor
binary search
,
constructive algorithms
,
interactive
3000
x297
1838E
Count Supersequences
combinatorics
,
dp
,
math
2500
x1369
1838D
Bracket Walk
data structures
,
greedy
,
strings
2100
x3076
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13412
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x15803
1838A
Blackboard List
constructive algorithms
,
math
800
x21044
1837F
Editorial for Two
binary search
,
data structures
,
greedy
,
implementation
2400
x2064
1837E
Playoff Fixing
combinatorics
,
trees
2200
x2095
1837D
Bracket Coloring
constructive algorithms
,
greedy
1400
x13281
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21076
1837B
Comparison String
greedy
900
x26461
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x29027
1836B
Astrophysicists
greedy
,
math
1100
x12263
1836A
Destroyer
implementation
,
sortings
800
x19771
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x143
1835E
Old Mobile
combinatorics
,
dp
,
probabilities
3500
x202
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x445
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x937
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x901
1835A
k-th equality
brute force
,
implementation
,
math
1700
x7416
1834F
Typewriter
brute force
,
math
2500
x488
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2049
1834D
Survey in Class
brute force
,
data structures
,
greedy
,
implementation
,
sortings
1900
x4341
1834C
Game with Reversing
games
,
greedy
,
math
,
strings
1200
x12608
1834B
Maximum Strength
greedy
,
math
1000
x14505
1834A
Unit Array
greedy
,
math
800
x21099
1833G
Ksyusha and Chinchilla
constructive algorithms
,
dfs and similar
,
dp
,
dsu
,
greedy
,
implementation
,
trees
1800
x4925
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6652
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x10242
1833D
Flipper
brute force
,
constructive algorithms
,
greedy
1400
x12658
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25484
1833B
Restore the Weather
greedy
,
sortings
900
x25348
1833A
Musical Puzzle
implementation
,
strings
800
x31526
1832F
Zombies
binary search
,
dp
3200
x252
1832E
Combinatorics Problem
brute force
,
combinatorics
,
dp
2200
x2054
1832D2
Red-Blue Operations (Hard Version)
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
2400
x1786
1832D1
Red-Blue Operations (Easy Version)
binary search
,
greedy
,
implementation
,
math
2100
x2786
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2-sat
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data structures
dfs and similar
divide and conquer
dp
dsu
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fft
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games
geometry
graph matchings
graphs
greedy
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number theory
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