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Before contest
Codeforces Round 950 (Div. 3)
37:06:49
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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
#
Name
1977A
Little Nikita
math
800
x23081
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x13199
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x15122
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x25695
1974A
Phone Desktop
greedy
,
math
800
x27863
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x20026
1972B
Coin Games
games
900
x17748
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x19633
1971C
Clock and Strings
implementation
900
x26225
1971B
Different String
implementation
,
strings
800
x29757
1971A
My First Sorting Problem
implementation
,
sortings
800
x35868
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2854
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x15680
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x17268
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x20925
1968B
Prefiquence
greedy
,
two pointers
800
x24485
1968A
Maximize?
brute force
,
math
,
number theory
800
x28956
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x15568
1957A
Stickogon
constructive algorithms
,
greedy
800
x20890
1956B
Nene and the Card Game
games
,
greedy
800
x19501
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x19639
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x24664
1955A
Yogurt Sale
math
800
x38005
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x21308
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x17064
1950C
Clock Conversion
implementation
,
math
800
x35878
1950B
Upscaling
implementation
800
x34269
1950A
Stair, Peak, or Neither?
implementation
800
x45271
1948A
Special Characters
brute force
,
constructive algorithms
800
x26739
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x24120
1945B
Fireworks
math
,
number theory
900
x20245
1945A
Setting up Camp
greedy
,
math
800
x25298
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x21701
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16027
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x30311
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x26978
1941A
Rudolf and the Ticket
brute force
,
math
800
x39527
1937A
Shuffle Party
implementation
,
math
800
x21781
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x25902
1934A
Too Min Too Max
greedy
,
math
800
x23771
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30362
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x35928
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x27236
1931C
Make Equal Again
brute force
,
greedy
,
math
1000
x26565
1931B
Make Equal
greedy
800
x30376
1931A
Recovering a Small String
brute force
,
strings
800
x33977
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x13887
1930A
Maximise The Score
greedy
,
sortings
800
x17392
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x24047
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x29359
1928A
Rectangle Cutting
geometry
,
math
800
x21433
1927C
Choose the Different Ones!
brute force
,
greedy
,
math
1000
x25951
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x30798
1927A
Make it White
greedy
,
strings
800
x40199
1926B
Vlad and Shapes
geometry
,
implementation
800
x30226
1926A
Vlad and the Best of Five
implementation
800
x42974
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x27428
1923A
Moving Chips
greedy
,
implementation
800
x23494
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26050
1921C
Sending Messages
greedy
,
math
900
x27616
1921B
Arranging Cats
greedy
,
implementation
800
x32237
1921A
Square
greedy
,
math
800
x40404
1920A
Satisfying Constraints
brute force
,
greedy
,
math
800
x26682
1919B
Plus-Minus Split
greedy
800
x28950
1919A
Wallet Exchange
games
,
math
800
x31960
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x22370
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x28966
1917A
Least Product
constructive algorithms
,
math
800
x24373
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23941
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24715
1915D
Unnatural Language Processing
greedy
,
implementation
,
strings
900
x28081
1915C
Can I Square?
binary search
,
implementation
800
x38223
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x39088
1915A
Odd One Out
bitmasks
,
implementation
800
x50808
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x28818
1914A
Problemsolving Log
implementation
,
strings
800
x30030
1913B
Swap and Delete
strings
1000
x22545
1913A
Rating Increase
implementation
800
x22481
1912L
LOL Lovers
strings
800
x6418
1909A
Distinct Buttons
implementation
,
math
800
x15827
1907B
YetnotherrokenKeoard
data structures
,
implementation
,
strings
1000
x23642
1907A
Rook
implementation
800
x34459
1906A
Easy As ABC
brute force
1000
x3616
1905A
Constructive Problems
constructive algorithms
,
math
800
x21957
1904A
Forked!
brute force
,
implementation
900
x16511
1903A
Halloumi Boxes
brute force
,
greedy
,
sortings
800
x25342
1902A
Binary Imbalance
constructive algorithms
800
x19974
1901A
Line Trip
greedy
,
math
800
x26132
1900B
Laura and Operations
dp
,
math
900
x16221
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x22671
1899A
Game with Integers
games
,
math
,
number theory
800
x38990
1898A
Milica and String
brute force
,
implementation
,
strings
800
x15203
1896B
AB Flipping
greedy
,
strings
,
two pointers
900
x13641
1896A
Jagged Swaps
sortings
800
x19457
1895B
Points and Minimum Distance
greedy
,
math
,
sortings
800
x19761
1895A
Treasure Chest
math
800
x23580
1894B
Two Out of Three
constructive algorithms
1000
x14891
1894A
Secret Sport
implementation
,
strings
800
x18227
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x18488
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x16773
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