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Before contest
Educational Codeforces Round 168 (Rated for Div. 2)
28:11:08
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Difficulty:
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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
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Status
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Custom test
Problems
#
Name
1995A
Diagonals
brute force
,
greedy
,
implementation
,
math
800
x19188
1994A
Diverse Game
constructive algorithms
,
greedy
,
implementation
800
x17121
1992B
Angry Monk
greedy
,
math
,
sortings
800
x29991
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x35401
1989A
Catch the Coin
implementation
800
x23827
1987A
Upload More RAM
greedy
,
math
800
x22637
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
800
x36556
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
800
x40716
1985A
Creating Words
implementation
,
strings
800
x45623
1984A
Strange Splitting
constructive algorithms
800
x19727
1983A
Array Divisibility
constructive algorithms
,
math
800
x23599
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x23113
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x20790
1980B
Choosing Cubes
sortings
,
sortings
800
x32453
1980A
Problem Generator
math
800
x37571
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x27372
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x20577
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x23549
1977A
Little Nikita
math
800
x28773
1976A
Verify Password
implementation
,
sortings
,
strings
800
x26393
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x17695
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x28727
1974A
Phone Desktop
greedy
,
math
800
x31432
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x21690
1971B
Different String
implementation
,
strings
800
x33706
1971A
My First Sorting Problem
implementation
,
sortings
800
x40796
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x18844
1968B
Prefiquence
greedy
,
two pointers
800
x26560
1968A
Maximize?
brute force
,
math
,
number theory
800
x31695
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x16892
1957A
Stickogon
constructive algorithms
,
greedy
800
x22209
1956B
Nene and the Card Game
games
,
greedy
800
x20499
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x20717
1955A
Yogurt Sale
math
800
x40569
1950C
Clock Conversion
implementation
,
math
800
x37671
1950B
Upscaling
implementation
800
x36022
1950A
Stair, Peak, or Neither?
implementation
800
x48292
1948A
Special Characters
brute force
,
constructive algorithms
800
x27631
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x25187
1945A
Setting up Camp
greedy
,
math
800
x26564
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x22732
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16714
1941A
Rudolf and the Ticket
brute force
,
math
800
x40971
1937A
Shuffle Party
implementation
,
math
800
x22522
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x26908
1934A
Too Min Too Max
greedy
,
math
800
x24574
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x31442
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x37072
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x28375
1931B
Make Equal
greedy
800
x31334
1931A
Recovering a Small String
brute force
,
strings
800
x34981
1930A
Maximise The Score
greedy
,
sortings
800
x17985
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x24610
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x30423
1928A
Rectangle Cutting
geometry
,
math
800
x22002
1927A
Make it White
greedy
,
strings
800
x41572
1926B
Vlad and Shapes
geometry
,
implementation
800
x31330
1926A
Vlad and the Best of Five
implementation
800
x45167
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x28066
1923A
Moving Chips
greedy
,
implementation
800
x24038
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26503
1921B
Arranging Cats
greedy
,
implementation
800
x33006
1921A
Square
greedy
,
math
800
x41621
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x27180
1919B
Plus-Minus Split
greedy
800
x29353
1919A
Wallet Exchange
games
,
math
800
x32570
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x29552
1917A
Least Product
constructive algorithms
,
math
800
x24888
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x25197
1915C
Can I Square?
binary search
,
implementation
800
x40105
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x40506
1915A
Odd One Out
bitmasks
,
implementation
800
x53355
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x29553
1914A
Problemsolving Log
implementation
,
strings
800
x30838
1913A
Rating Increase
implementation
800
x22996
1912L
LOL Lovers
strings
800
x6698
1909A
Distinct Buttons
implementation
,
math
800
x16221
1907A
Rook
implementation
800
x35500
1905A
Constructive Problems
constructive algorithms
,
math
800
x22461
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x28132
1902A
Binary Imbalance
constructive algorithms
800
x20460
1901A
Line Trip
greedy
,
math
800
x28456
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x24721
1899A
Game with Integers
games
,
math
,
number theory
800
x41888
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15593
1896A
Jagged Swaps
sortings
800
x21298
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x20127
1895A
Treasure Chest
math
800
x24001
1894A
Secret Sport
implementation
,
strings
800
x18590
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18904
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x17189
1890A
Doremy's Paint 3
constructive algorithms
800
x24294
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x25305
1884A
Simple Design
brute force
,
greedy
,
math
800
x17132
1883A
Morning
math
800
x25023
1882A
Increasing Sequence
greedy
800
x24981
1881A
Don't Try to Count
brute force
,
strings
800
x29809
1879A
Rigged!
greedy
800
x22831
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x30870
1878A
How Much Does Daytona Cost?
greedy
800
x41807
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