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Before contest
Codeforces Round 941 (Div. 1)
09:13:36
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Before contest
Codeforces Round 941 (Div. 2)
09:13:36
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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
x11950
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x299
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x7988
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x209
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x5083
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x7992
1939C
More Gifts
*special problem
,
dfs and similar
,
two pointers
x272
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x403
1936B
Pinball
binary search
,
data structures
,
implementation
,
math
,
two pointers
2000
x2370
1932C
LR-remainders
brute force
,
data structures
,
implementation
,
math
,
two pointers
1400
x13423
1928B
Equalize
binary search
,
greedy
,
sortings
,
two pointers
1200
x15074
1927E
Klever Permutation
constructive algorithms
,
math
,
two pointers
1400
x12238
1927D
Find the Different Ones!
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
two pointers
1300
x18057
1923D
Slimes
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5787
1921D
Very Different Array
data structures
,
greedy
,
sortings
,
two pointers
1100
x19841
1918D
Blocking Elements
binary search
,
data structures
,
dp
,
implementation
,
two pointers
1900
x4207
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x54
1905D
Cyclic MEX
data structures
,
implementation
,
math
,
two pointers
2000
x3459
1904C
Array Game
binary search
,
brute force
,
data structures
,
sortings
,
two pointers
1400
x10470
1904B
Collecting Game
binary search
,
dp
,
greedy
,
sortings
,
two pointers
1100
x12703
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x143
1899G
Unusual Entertainment
data structures
,
dfs and similar
,
dsu
,
shortest paths
,
sortings
,
trees
,
two pointers
1900
x2889
1899C
Yarik and Array
dp
,
greedy
,
two pointers
1100
x17961
1898E
Sofia and Strings
data structures
,
greedy
,
sortings
,
strings
,
two pointers
2200
x2028
1896D
Ones and Twos
binary search
,
data structures
,
divide and conquer
,
math
,
two pointers
1700
x5138
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13279
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1449
1893B
Neutral Tonality
constructive algorithms
,
greedy
,
sortings
,
two pointers
1700
x8023
1891C
Smilo and Monsters
binary search
,
constructive algorithms
,
greedy
,
sortings
,
two pointers
1500
x11170
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x802
1887C
Minimum Array
binary search
,
brute force
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
two pointers
2400
x1560
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
x11612
1883G2
Dances (Hard Version)
binary search
,
greedy
,
sortings
,
two pointers
1900
x4840
1883G1
Dances (Easy version)
binary search
,
greedy
,
two pointers
1400
x9069
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x805
1873F
Money Trees
binary search
,
greedy
,
math
,
two pointers
1300
x13695
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x32399
1870C
Colorful Table
binary search
,
data structures
,
dp
,
implementation
,
math
,
two pointers
1300
x10680
1866I
Imagination Castle
dp
,
games
,
two pointers
2300
x667
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2600
1858D
Trees and Segments
brute force
,
data structures
,
dp
,
greedy
,
two pointers
2200
x2682
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4126
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2903
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x27964
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
x7708
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19024
1845D
Rating System
binary search
,
brute force
,
data structures
,
dp
,
dsu
,
greedy
,
math
,
two pointers
1800
x7284
1843E
Tracking Segments
binary search
,
brute force
,
data structures
,
two pointers
1600
x10897
1843B
Long Long
greedy
,
math
,
two pointers
800
x27932
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x32862
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x469
1841D
Pairs of Segments
data structures
,
greedy
,
sortings
,
two pointers
2000
x4115
1840C
Ski Resort
combinatorics
,
math
,
two pointers
1000
x24419
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x32432
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x895
1833F
Ira and Flamenco
combinatorics
,
constructive algorithms
,
data structures
,
implementation
,
math
,
sortings
,
two pointers
1700
x6621
1832B
Maximum Sum
brute force
,
sortings
,
two pointers
1100
x19504
1827B1
Range Sorting (Easy Version)
binary search
,
dp
,
dsu
,
greedy
,
trees
,
two pointers
2000
x3646
1827A
Counting Orders
combinatorics
,
math
,
sortings
,
two pointers
1100
x17384
1820B
JoJo's Incredible Adventures
math
,
strings
,
two pointers
1100
x13288
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x593
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3413
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
x1608
1808D
Petya, Petya, Petr, and Palindromes
binary search
,
brute force
,
data structures
,
two pointers
2100
x2149
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
x1519
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1179
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3858
1794C
Scoring Subsequences
binary search
,
greedy
,
math
,
two pointers
1300
x12404
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
x5736
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18025
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x13137
1791C
Prepend and Append
implementation
,
two pointers
800
x40212
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x15747
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3710
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
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
x7673
1776H
Beppa and SwerChat
two pointers
1300
x5992
1774D
Same Count One
brute force
,
constructive algorithms
,
greedy
,
implementation
,
two pointers
1600
x7392
1772G
Gaining Rating
binary search
,
greedy
,
implementation
,
math
,
sortings
,
two pointers
2200
x1261
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
x12762
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
x3901
1761E
Make It Connected
binary search
,
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
matrices
,
trees
,
two pointers
2400
x1720
1760D
Challenging Valleys
implementation
,
two pointers
1000
x22267
1758D
Range = √Sum
binary search
,
brute force
,
constructive algorithms
,
math
,
two pointers
1800
x6845
1753F
Minecraft Series
brute force
,
two pointers
3500
x185
1746B
Rebellion
constructive algorithms
,
greedy
,
two pointers
800
x16702
1744F
MEX vs MED
math
,
two pointers
2000
x2868
1744C
Traffic Light
binary search
,
implementation
,
two pointers
1000
x24060
1741C
Minimize the Thickness
brute force
,
greedy
,
math
,
two pointers
1100
x17159
1738E
Balance Addicts
combinatorics
,
dp
,
math
,
two pointers
2300
x1449
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1230
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14460
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