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Codeforces Round 941 (Div. 1)
3 days
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Codeforces Round 941 (Div. 2)
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two pointers
combine-tags-by-or
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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
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x11751
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x298
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7943
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x205
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5057
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x7947
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x272
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x398
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2358
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13379
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15026
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12210
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18017
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5763
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19820
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4198
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x54
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3451
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10432
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12674
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x142
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2884
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x17913
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2026
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5130
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13259
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1448
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8013
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11150
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x799
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1559
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1320
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x11590
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4832
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9035
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x804
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x13679
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x32347
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10674
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x666
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2597
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2677
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4119
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2900
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x27935
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1491
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x7694
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19007
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7275
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10882
1843B
Long Long
greedy
,
math
,
two pointers
800
x27912
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32831
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x469
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4113
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24391
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32408
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x894
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6611
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19482
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3641
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17372
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13271
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x593
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3412
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x817
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1606
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2140
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x319
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1516
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1178
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3853
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12390
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x923
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5730
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18004
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13125
1791C
Prepend and Append
implementation
,
two pointers
800
x40122
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15743
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3702
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x147
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1261
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7663
1776H
Beppa and SwerChat
two pointers
1300
x5984
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7385
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1260
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x657
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12748
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1123
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3900
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1717
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22255
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6837
1753F
Minecraft Series
brute force
,
two pointers
3500
x185
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16699
1744F
MEX vs MED
math
,
two pointers
2000
x2867
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24027
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17153
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1448
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1228
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14448
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