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Refact.ai Match 1 (Codeforces Round 985)
5 days
Register now »
*has extra registration
→ Filter Problems
Difficulty:
—
two pointers
combine-tags-by-or
*combine tags by OR
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
2036F
XORificator 3000
bitmasks
,
dp
,
number theory
,
two pointers
x2315
2033C
Sakurako's Field Trip
dp
,
greedy
,
two pointers
1400
x11640
2032D
Genokraken
constructive algorithms
,
data structures
,
graphs
,
interactive
,
trees
,
two pointers
x3715
2032C
Trinity
binary search
,
math
,
sortings
,
two pointers
x9486
2030F
Orangutan Approved Subarrays
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
2400
x559
2027D2
The Endspeaker (Hard Version)
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
2200
x1094
2027D1
The Endspeaker (Easy Version)
binary search
,
dp
,
graphs
,
greedy
,
implementation
,
two pointers
1700
x4030
2025D
Attribute Checks
brute force
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1800
x5588
2025C
New Game
binary search
,
brute force
,
greedy
,
implementation
,
sortings
,
two pointers
1300
x13955
2025A
Two Screens
binary search
,
greedy
,
strings
,
two pointers
800
x22746
2018B
Speedbreaker
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
two pointers
1900
x3807
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x3021
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3675
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1608
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x415
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x508
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x22620
2000B
Seating in a Bus
two pointers
800
x33462
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x20494
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x297
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x376
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x8691
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x17836
1994C
Hungry Games
binary search
,
dp
,
two pointers
1600
x10645
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5718
1990F
Polygonal Segments
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
two pointers
2800
x286
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5918
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x15139
1983F
array-value
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
2500
x1185
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x17468
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1433
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1317
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x4365
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x10348
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3557
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x14027
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x22888
1968B
Prefiquence
greedy
,
two pointers
800
x27842
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x646
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x15473
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x389
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9462
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x302
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x6022
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9704
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x315
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x512
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2933
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x15818
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x17572
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x14099
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x21691
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6838
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x21729
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4829
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x57
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3886
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x13452
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x15670
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x155
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x3252
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x21506
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2296
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5802
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x14953
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1578
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8971
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x13492
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x970
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1754
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1486
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12764
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x5444
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x11233
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x888
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x15709
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x35450
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11563
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x770
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2782
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2850
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4522
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x3269
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x29455
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1668
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x8614
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x20105
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7903
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x12529
1843B
Long Long
greedy
,
math
,
two pointers
800
x29122
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x34374
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x499
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4459
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x28253
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x34243
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x949
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x7467
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x22422
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3907
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x19284
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