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Before contest
Codeforces Round 954 (Div. 3)
6 days
→ 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
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x971
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
2000
x3182
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x8198
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2929
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12012
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x20454
1968B
Prefiquence
greedy
,
two pointers
800
x25278
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x517
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13664
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x329
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8527
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x256
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5407
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8565
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x280
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x442
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2547
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14311
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15851
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12852
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x19013
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6122
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20418
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4384
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x55
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3578
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x11148
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x13505
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x146
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2975
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x18827
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2107
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5338
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13784
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1474
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8264
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11780
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x832
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1609
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1362
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x11966
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4996
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9621
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x829
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14418
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33463
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10960
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x683
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2648
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2727
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4234
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2996
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28457
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1546
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x7926
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19350
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7451
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11345
1843B
Long Long
greedy
,
math
,
two pointers
800
x28285
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33284
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x478
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4199
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x25380
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x33059
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x914
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6894
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x20193
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3713
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17832
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13675
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x604
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3472
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x832
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1666
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2213
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x333
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1547
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1206
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4051
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12793
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x948
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5854
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18669
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13516
1791C
Prepend and Append
implementation
,
two pointers
800
x41721
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15898
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3768
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x149
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1273
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7986
1776H
Beppa and SwerChat
two pointers
1300
x6110
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7521
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1291
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x668
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x13323
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1148
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3974
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1749
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22789
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6998
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