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Before contest
Codeforces Round 973 (Div. 2)
13:33:09
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→ 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
2010C2
Message Transmission Error (hard version)
hashing
,
string suffix structures
,
strings
,
two pointers
1700
x2287
2009G1
Yunli's Subarray Queries (easy version)
binary search
,
data structures
,
two pointers
1900
x3071
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1378
2003F
Turtle and Three Sequences
brute force
,
data structures
,
dp
,
greedy
,
math
,
probabilities
,
two pointers
2800
x346
2003E2
Turtle and Inversions (Hard Version)
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
math
,
two pointers
2700
x451
2000D
Right Left Wrong
greedy
,
implementation
,
two pointers
1200
x21236
2000B
Seating in a Bus
two pointers
800
x31932
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x19688
1995E2
Let Me Teach You a Lesson (Hard Version)
data structures
,
dp
,
matrices
,
two pointers
2900
x281
1995E1
Let Me Teach You a Lesson (Easy Version)
2-sat
,
data structures
,
dp
,
matrices
,
two pointers
2700
x354
1995B2
Bouquet (Hard Version)
binary search
,
data structures
,
greedy
,
math
,
sortings
,
two pointers
1700
x8280
1995B1
Bouquet (Easy Version)
binary search
,
brute force
,
greedy
,
sortings
,
two pointers
1100
x17041
1994C
Hungry Games
binary search
,
dp
,
two pointers
1600
x10055
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5449
1990F
Polygonal Segments
brute force
,
data structures
,
divide and conquer
,
dp
,
greedy
,
two pointers
2800
x256
1989D
Smithing Skill
brute force
,
data structures
,
dp
,
greedy
,
math
,
sortings
,
two pointers
1900
x5667
1986D
Mathematical Problem
brute force
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1400
x14672
1983F
array-value
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
2500
x1105
1982C
Boring Day
binary search
,
data structures
,
dp
,
greedy
,
two pointers
1200
x16737
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1384
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1264
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x4144
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x9980
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x3449
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13587
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x22523
1968B
Prefiquence
greedy
,
two pointers
800
x27403
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x630
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x14956
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x369
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9190
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x288
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5849
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9457
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x302
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x491
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2813
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x15431
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x17063
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x13774
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x20994
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6627
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x21378
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4697
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x57
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3785
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x12730
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x15075
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x152
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x3170
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x20811
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2241
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5666
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x14633
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1550
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8762
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x13055
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x871
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1706
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1430
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x12587
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x5330
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x10771
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x871
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x15321
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x34814
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x11407
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x728
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2747
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2810
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4432
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x3199
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x29149
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1632
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x8412
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19911
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7765
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x12218
1843B
Long Long
greedy
,
math
,
two pointers
800
x28895
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x34086
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x486
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4374
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x27464
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33878
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x934
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x7298
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x21740
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3855
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x18887
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x14564
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x632
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3554
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x860
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1745
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2302
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x347
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1603
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1264
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4280
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x13682
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