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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
23:05:09
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Difficulty:
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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
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x11315
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x297
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7865
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x187
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5013
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x7876
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x269
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x395
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2343
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13290
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x14962
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12157
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x17940
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5729
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19761
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4186
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x53
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3436
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10377
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12612
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x141
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2864
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x17836
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2019
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5115
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13219
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1441
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x7999
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11104
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x794
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1552
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1310
1884B
Haunted House
binary search
,
greedy
,
math
,
two pointers
1100
x11564
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4816
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x8996
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x802
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x13636
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x32277
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10663
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x665
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2591
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2669
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4110
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2889
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x27889
1849E
Max to the Right of Min
binary search
,
data structures
,
divide and conquer
,
dp
,
dsu
,
two pointers
2300
x1485
1849D
Array Painting
constructive algorithms
,
greedy
,
two pointers
1700
x7675
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x18977
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7253
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10854
1843B
Long Long
greedy
,
math
,
two pointers
800
x27872
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32794
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x467
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4107
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24314
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32375
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x888
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6602
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19425
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3630
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17334
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13223
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x590
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3402
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x815
1811G2
Vlad and the Nice Paths (hard version)
binary search
,
combinatorics
,
data structures
,
dp
,
math
,
two pointers
2200
x1597
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2126
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x318
1805E
There Should Be a Lot of Maximums
brute force
,
data structures
,
dfs and similar
,
dp
,
trees
,
two pointers
2300
x1514
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1174
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3846
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12345
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x919
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x5721
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x17959
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13103
1791C
Prepend and Append
implementation
,
two pointers
800
x39977
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15726
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3694
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x146
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1259
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7653
1776H
Beppa and SwerChat
two pointers
1300
x5975
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7371
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
x656
1771B
Hossam and Friends
binary search
,
constructive algorithms
,
dp
,
two pointers
1400
x12718
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1119
1765D
Watch the Videos
binary search
,
constructive algorithms
,
two pointers
1700
x3890
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1715
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22228
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6821
1753F
Minecraft Series
brute force
,
two pointers
3500
x184
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16688
1744F
MEX vs MED
math
,
two pointers
2000
x2863
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x23958
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17123
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1448
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1226
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14433
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