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Before contest
Codeforces Round (Div. 3)
4 days
→ Filter Problems
Difficulty:
—
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
Submit
Status
Standings
Custom test
Problems
#
Name
1989A
Catch the Coin
implementation
800
x20929
1987A
Upload More RAM
greedy
,
math
800
x19639
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
800
x33310
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
800
x38359
1985A
Creating Words
implementation
,
strings
800
x42735
1984A
Strange Splitting
constructive algorithms
800
x18780
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x21567
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x20006
1980B
Choosing Cubes
sortings
,
sortings
800
x31327
1980A
Problem Generator
math
800
x36270
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x26399
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x19364
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x22135
1977A
Little Nikita
math
800
x27773
1976A
Verify Password
implementation
,
sortings
,
strings
800
x25502
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x17212
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x28086
1974A
Phone Desktop
greedy
,
math
800
x30662
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x21203
1971B
Different String
implementation
,
strings
800
x32832
1971A
My First Sorting Problem
implementation
,
sortings
800
x39676
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x18486
1968B
Prefiquence
greedy
,
two pointers
800
x25870
1968A
Maximize?
brute force
,
math
,
number theory
800
x30840
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x16541
1957A
Stickogon
constructive algorithms
,
greedy
800
x21830
1956B
Nene and the Card Game
games
,
greedy
800
x20212
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x20405
1955A
Yogurt Sale
math
800
x39670
1950C
Clock Conversion
implementation
,
math
800
x37182
1950B
Upscaling
implementation
800
x35512
1950A
Stair, Peak, or Neither?
implementation
800
x47309
1948A
Special Characters
brute force
,
constructive algorithms
800
x27363
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x24885
1945A
Setting up Camp
greedy
,
math
800
x26182
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x22399
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16494
1941A
Rudolf and the Ticket
brute force
,
math
800
x40491
1937A
Shuffle Party
implementation
,
math
800
x22285
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x26609
1934A
Too Min Too Max
greedy
,
math
800
x24347
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x31101
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x36689
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x27988
1931B
Make Equal
greedy
800
x30983
1931A
Recovering a Small String
brute force
,
strings
800
x34608
1930A
Maximise The Score
greedy
,
sortings
800
x17813
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x24419
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x30129
1928A
Rectangle Cutting
geometry
,
math
800
x21825
1927A
Make it White
greedy
,
strings
800
x41124
1926B
Vlad and Shapes
geometry
,
implementation
800
x31025
1926A
Vlad and the Best of Five
implementation
800
x44510
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27873
1923A
Moving Chips
greedy
,
implementation
800
x23865
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26360
1921B
Arranging Cats
greedy
,
implementation
800
x32717
1921A
Square
greedy
,
math
800
x41177
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26987
1919B
Plus-Minus Split
greedy
800
x29215
1919A
Wallet Exchange
games
,
math
800
x32352
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x29364
1917A
Least Product
constructive algorithms
,
math
800
x24707
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x25045
1915C
Can I Square?
binary search
,
implementation
800
x39491
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x40022
1915A
Odd One Out
bitmasks
,
implementation
800
x52514
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x29261
1914A
Problemsolving Log
implementation
,
strings
800
x30552
1913A
Rating Increase
implementation
800
x22873
1912L
LOL Lovers
strings
800
x6618
1909A
Distinct Buttons
implementation
,
math
800
x15998
1907A
Rook
implementation
800
x35123
1905A
Constructive Problems
constructive algorithms
,
math
800
x22304
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x27049
1902A
Binary Imbalance
constructive algorithms
800
x20253
1901A
Line Trip
greedy
,
math
800
x27492
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x23893
1899A
Game with Integers
games
,
math
,
number theory
800
x40703
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15458
1896A
Jagged Swaps
sortings
800
x20559
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x20022
1895A
Treasure Chest
math
800
x23867
1894A
Secret Sport
implementation
,
strings
800
x18466
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18778
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x17038
1890A
Doremy's Paint 3
constructive algorithms
800
x23589
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x25097
1884A
Simple Design
brute force
,
greedy
,
math
800
x16939
1883A
Morning
math
800
x24737
1882A
Increasing Sequence
greedy
800
x24852
1881A
Don't Try to Count
brute force
,
strings
800
x29084
1879A
Rigged!
greedy
800
x22709
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x30633
1878A
How Much Does Daytona Cost?
greedy
800
x40963
1877A
Goals of Victory
math
800
x20587
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33796
1873C
Target Practice
implementation
,
math
800
x37422
1873B
Good Kid
brute force
,
greedy
,
math
800
x46264
1873A
Short Sort
brute force
,
implementation
800
x51019
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