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Codeforces Round 950 (Div. 3)
2 days
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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
1976D
Invertible Bracket Sequences
binary search
,
combinatorics
,
data structures
,
divide and conquer
,
implementation
,
two pointers
x2397
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
x7094
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
1900
x2603
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11329
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x19590
1968B
Prefiquence
greedy
,
two pointers
800
x24448
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x493
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x13311
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x325
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x8390
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x250
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5312
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x8391
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x278
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x428
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2504
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x14032
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15609
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12652
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18690
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x6052
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x20241
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4341
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x55
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3554
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10901
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x13213
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
x2944
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x18521
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2076
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5278
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13633
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1470
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8181
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11530
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x827
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1597
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1348
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x11818
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4931
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9416
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x826
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x14108
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33029
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10870
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x681
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2638
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2718
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4184
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2969
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28277
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1532
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x7867
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19228
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7393
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x11218
1843B
Long Long
greedy
,
math
,
two pointers
800
x28183
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33155
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x478
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4177
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x25029
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32850
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x909
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6817
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19966
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3693
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17655
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13554
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x601
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3452
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x828
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1642
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2186
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x330
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1535
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1203
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3998
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12644
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x940
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5822
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18403
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13416
1791C
Prepend and Append
implementation
,
two pointers
800
x41202
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15853
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3749
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
x1272
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7904
1776H
Beppa and SwerChat
two pointers
1300
x6071
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7475
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1280
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x665
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x13100
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1141
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3948
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1744
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22577
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6939
1753F
Minecraft Series
brute force
,
two pointers
3500
x194
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