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Custom test
Problems
#
Name
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x74458
1899A
Game with Integers
games
,
math
,
number theory
800
x105663
1898A
Milica and String
brute force
,
implementation
,
strings
800
x17603
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x19029
1896A
Jagged Swaps
sortings
800
x66746
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x21770
1895A
Treasure Chest
math
800
x26197
1894A
Secret Sport
implementation
,
strings
800
x20596
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x20713
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x18960
1890A
Doremy's Paint 3
constructive algorithms
800
x65415
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x27962
1884A
Simple Design
brute force
,
greedy
,
math
800
x19373
1883B
Chemistry
strings
900
x66990
1883A
Morning
math
800
x29927
1882A
Increasing Sequence
greedy
800
x27509
1881B
Three Threadlets
math
900
x29231
1881A
Don't Try to Count
brute force
,
strings
800
x67602
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x25383
1879A
Rigged!
greedy
800
x24774
1878C
Vasilije in Cacak
math
900
x64500
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x34650
1878A
How Much Does Daytona Cost?
greedy
800
x88172
1877A
Goals of Victory
math
800
x60250
1875A
Jellyfish and Undertale
brute force
,
greedy
900
x53046
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x44753
1873C
Target Practice
implementation
,
math
800
x78204
1873B
Good Kid
brute force
,
greedy
,
math
800
x65158
1873A
Short Sort
brute force
,
implementation
800
x74595
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x30864
1872A
Two Vessels
brute force
,
greedy
,
math
800
x43904
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x20406
1869A
Make It Zero
constructive algorithms
900
x45012
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x21257
1866A
Ambitious Kid
math
800
x59275
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x21584
1863A
Channel
greedy
,
implementation
800
x18951
1862B
Sequence Game
constructive algorithms
800
x61756
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x36805
1861A
Prime Deletion
constructive algorithms
,
math
800
x26253
1860A
Not a Substring
constructive algorithms
,
strings
900
x23849
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x60926
1858A
Buttons
games
,
greedy
,
math
800
x74092
1857A
Array Coloring
greedy
,
math
800
x87417
1856B
Good Arrays
implementation
,
math
900
x27983
1856A
Tales of a Sort
implementation
800
x28347
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x50266
1855A
Dalton the Teacher
greedy
,
math
800
x30201
1853A
Desorting
brute force
,
greedy
,
math
800
x62655
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x33142
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x31842
1850D
Balanced Round
brute force
,
greedy
,
implementation
,
sortings
900
x67374
1850C
Word on the Paper
implementation
,
strings
800
x55365
1850B
Ten Words of Wisdom
implementation
,
sortings
800
x51729
1850A
To My Critics
implementation
,
sortings
800
x77434
1849A
Morning Sandwich
implementation
,
math
800
x32523
1848A
Vika and Her Friends
games
,
math
900
x18589
1847A
The Man who became a God
greedy
,
sortings
800
x22989
1846B
Rudolph and Tic-Tac-Toe
brute force
,
implementation
,
strings
800
x29189
1846A
Rudolph and Cut the Rope
implementation
,
math
800
x35115
1845B
Come Together
geometry
,
implementation
,
math
900
x24123
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x53441
1844A
Subtraction Game
constructive algorithms
,
games
800
x26094
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x40776
1843B
Long Long
greedy
,
math
,
two pointers
800
x32657
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x37862
1842A
Tenzing and Tsondu
games
,
math
800
x20990
1841A
Game with Board
constructive algorithms
,
games
800
x26193
1840A
Cipher Shifer
implementation
,
strings
,
two pointers
800
x39145
1839A
The Good Array
greedy
,
implementation
,
math
800
x18420
1838A
Blackboard List
constructive algorithms
,
math
800
x22812
1837B
Comparison String
greedy
900
x55829
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x60997
1836A
Destroyer
implementation
,
sortings
800
x21637
1834A
Unit Array
greedy
,
math
800
x51745
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x28250
1833B
Restore the Weather
greedy
,
sortings
900
x30217
1833A
Musical Puzzle
implementation
,
strings
800
x35523
1832A
New Palindrome
strings
800
x29648
1831A
Twin Permutations
constructive algorithms
800
x51744
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x33224
1829B
Blank Space
implementation
800
x86524
1829A
Love Story
implementation
,
strings
800
x74017
1828B
Permutation Swap
math
,
number theory
900
x43862
1828A
Divisible Array
constructive algorithms
,
math
800
x25612
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x21031
1823B
Sort with Step
brute force
,
math
,
sortings
900
x18403
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x17365
1822C
Bun Lover
math
800
x25103
1822B
Karina and Array
greedy
,
math
,
sortings
800
x26800
1822A
TubeTube Feed
brute force
,
implementation
800
x26287
1821A
Matching
combinatorics
,
math
800
x21461
1820A
Yura's New Name
implementation
,
strings
800
x17830
1818B
Indivisible
constructive algorithms
900
x17392
1818A
Politics
greedy
,
implementation
800
x14722
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x19022
1814A
Coins
implementation
,
math
800
x57984
1811A
Insert Digit
greedy
,
math
,
strings
800
x35166
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x19063
1810A
Beautiful Sequence
brute force
,
greedy
800
x22095
←
1
2
3
4
5
6
7
...
14
15
→
→ Pay attention
Before contest
Codeforces Round 1124 (Div. 1)
21:24:48
Before contest
Codeforces Round 1124 (Div. 2)
21:24:47
→ Filter Problems
Difficulty:
—
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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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