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Before contest
Educational Codeforces Round 167 (Rated for Div. 2)
21:03:40
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Difficulty:
—
greedy
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
Standings
Custom test
Problems
#
Name
1985C
Good Prefixes
greedy
1000
x25252
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x19320
1979B
XOR Sequences
bitmasks
,
greedy
1000
x19591
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x25663
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x18228
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x20756
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x15214
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x16799
1974A
Phone Desktop
greedy
,
math
800
x30162
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x20801
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x16673
1968B
Prefiquence
greedy
,
two pointers
800
x25612
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x16284
1957A
Stickogon
constructive algorithms
,
greedy
800
x21586
1956B
Nene and the Card Game
games
,
greedy
800
x20022
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x20206
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x21979
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x17988
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x24680
1945A
Setting up Camp
greedy
,
math
800
x26027
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x22222
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x31027
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x27643
1934A
Too Min Too Max
greedy
,
math
800
x24179
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x36501
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x27817
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x27133
1931B
Make Equal
greedy
800
x30836
1930A
Maximise The Score
greedy
,
sortings
800
x17714
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x24305
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x29911
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x26387
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x31288
1927A
Make it White
greedy
,
strings
800
x40890
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27755
1923A
Moving Chips
greedy
,
implementation
800
x23742
1921C
Sending Messages
greedy
,
math
900
x27991
1921B
Arranging Cats
greedy
,
implementation
800
x32581
1921A
Square
greedy
,
math
800
x40988
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26901
1919B
Plus-Minus Split
greedy
800
x29134
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22697
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x29245
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x28580
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x26535
1901A
Line Trip
greedy
,
math
800
x27052
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x23516
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13876
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x19939
1884A
Simple Design
brute force
,
greedy
,
math
800
x16819
1882A
Increasing Sequence
greedy
800
x24759
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x21648
1879A
Rigged!
greedy
800
x22609
1878A
How Much Does Daytona Cost?
greedy
800
x40610
1876A
Helmets in Night Light
greedy
,
sortings
1000
x15718
1875A
Jellyfish and Undertale
brute force
,
greedy
900
x22961
1873D
1D Eraser
greedy
,
implementation
,
two pointers
800
x33616
1873B
Good Kid
brute force
,
greedy
,
math
800
x45956
1872B
The Corridor or There and Back Again
greedy
,
implementation
900
x27111
1872A
Two Vessels
brute force
,
greedy
,
math
800
x37995
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x18706
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x19958
1863A
Channel
greedy
,
implementation
800
x17629
1862A
Gift Carpet
dp
,
greedy
,
implementation
,
strings
800
x31426
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x20615
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x25181
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22350
1858A
Buttons
games
,
greedy
,
math
800
x35612
1857A
Array Coloring
greedy
,
math
800
x45001
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x24739
1855A
Dalton the Teacher
greedy
,
math
800
x27460
1853A
Desorting
brute force
,
greedy
,
math
800
x29471
1851C
Tiles Comeback
greedy
1000
x22690
1851B
Parity Sort
greedy
,
sortings
,
two pointers
800
x28583
1850D
Balanced Round
brute force
,
greedy
,
implementation
,
sortings
900
x33807
1849B
Monsters
greedy
,
math
,
sortings
1000
x23682
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19416
1847A
The Man who became a God
greedy
,
sortings
800
x21796
1843B
Long Long
greedy
,
math
,
two pointers
800
x28358
1843A
Sasha and Array Coloring
greedy
,
sortings
,
two pointers
800
x33433
1839A
The Good Array
greedy
,
implementation
,
math
800
x17200
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21405
1837B
Comparison String
greedy
900
x27501
1834B
Maximum Strength
greedy
,
math
1000
x14782
1834A
Unit Array
greedy
,
math
800
x22363
1833C
Vlad Building Beautiful Array
greedy
,
math
800
x25736
1833B
Restore the Weather
greedy
,
sortings
900
x25747
1831B
Array merging
constructive algorithms
,
greedy
1000
x19267
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27640
1825B
LuoTianyi and the Table
greedy
,
math
1000
x14331
1825A
LuoTianyi and the Palindrome String
greedy
,
strings
800
x19404
1822B
Karina and Array
greedy
,
math
,
sortings
800
x24293
1818A
Politics
greedy
,
implementation
800
x12772
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x14920
1811A
Insert Digit
greedy
,
math
,
strings
800
x30391
1810A
Beautiful Sequence
brute force
,
greedy
800
x20481
1809B
Points on Plane
binary search
,
greedy
,
math
1000
x19266
1807C
Find and Replace
greedy
,
implementation
,
strings
800
x29608
1807B
Grab the Candies
greedy
800
x40494
1806B
Mex Master
constructive algorithms
,
greedy
900
x17277
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