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Please read
the new rule regarding the restriction on the use of AI tools
.
×
→ Pay attention
Before contest
Codeforces Round 975 (Div. 1)
3 days
Before contest
Codeforces Round 975 (Div. 2)
3 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
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Status
Standings
Custom test
Problems
#
Name
2010B
Three Brothers
brute force
,
implementation
,
math
800
x16213
2010A
Alternating Sum of Numbers
brute force
,
implementation
,
math
800
x13485
2009B
osu!mania
brute force
,
implementation
800
x36762
2009A
Minimize!
brute force
,
math
800
x43763
2008C
Longest Good Array
binary search
,
brute force
,
math
800
x27448
2008B
Square or Not
brute force
,
math
,
strings
800
x26209
2008A
Sakurako's Exam
brute force
,
constructive algorithms
,
greedy
,
math
800
x31819
2007B
Index and Maximum Value
data structures
,
greedy
900
x19085
2007A
Dora's Set
greedy
,
math
,
number theory
800
x21021
2004A
Closest Point
implementation
,
math
800
x28664
2003B
Turtle and Piggy Are Playing a Game 2
games
,
greedy
,
sortings
800
x23777
2003A
Turtle and Good Strings
greedy
,
strings
800
x27365
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x18640
2001B
Generate Permutation
constructive algorithms
800
x23195
2001A
Make All Equal
greedy
,
implementation
800
x28307
2000B
Seating in a Bus
two pointers
800
x32183
2000A
Primary Task
implementation
,
math
,
strings
800
x35307
1999C
Showering
greedy
,
implementation
800
x33095
1999A
A+B Again?
implementation
,
math
800
x48226
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x23121
1997A
Strong Password
brute force
,
implementation
,
strings
800
x27601
1996B
Scale
greedy
,
implementation
800
x31431
1996A
Legs
binary search
,
math
,
ternary search
800
x40122
1995A
Diagonals
brute force
,
greedy
,
implementation
,
math
800
x23534
1994A
Diverse Game
constructive algorithms
,
greedy
,
implementation
800
x19674
1993A
Question Marks
greedy
,
implementation
800
x28291
1992C
Gorilla and Permutation
constructive algorithms
,
math
900
x28052
1992B
Angry Monk
greedy
,
math
,
sortings
800
x33066
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x39477
1991A
Maximize the Last Element
greedy
,
implementation
800
x21045
1990A
Submission Bait
brute force
,
games
,
greedy
,
sortings
900
x21465
1989A
Catch the Coin
implementation
800
x25674
1988B
Make Majority
greedy
,
implementation
900
x21704
1988A
Split the Multiset
brute force
,
greedy
,
implementation
,
math
900
x22168
1987A
Upload More RAM
greedy
,
math
800
x24431
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
800
x39016
1985D
Manhattan Circle
implementation
,
math
900
x33356
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
800
x44377
1985A
Creating Words
implementation
,
strings
800
x50791
1984A
Strange Splitting
constructive algorithms
800
x20577
1983A
Array Divisibility
constructive algorithms
,
math
800
x24985
1982A
Soccer
greedy
,
implementation
,
math
,
sortings
800
x24335
1981A
Turtle and Piggy Are Playing a Game
brute force
,
greedy
,
math
800
x21787
1980B
Choosing Cubes
sortings
,
sortings
800
x33782
1980A
Problem Generator
math
800
x39356
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x28524
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x21791
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x24988
1977A
Little Nikita
math
800
x30446
1976A
Verify Password
implementation
,
sortings
,
strings
800
x27968
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x18243
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
800
x29584
1974A
Phone Desktop
greedy
,
math
800
x32584
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
900
x23824
1972B
Coin Games
games
900
x20999
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x22564
1971C
Clock and Strings
implementation
900
x31838
1971B
Different String
implementation
,
strings
800
x35828
1971A
My First Sorting Problem
implementation
,
sortings
800
x43529
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x19594
1968B
Prefiquence
greedy
,
two pointers
800
x27438
1968A
Maximize?
brute force
,
math
,
number theory
800
x33273
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x17550
1957A
Stickogon
constructive algorithms
,
greedy
800
x22939
1956B
Nene and the Card Game
games
,
greedy
800
x20995
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x21297
1955A
Yogurt Sale
math
800
x42254
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x23617
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x19293
1950C
Clock Conversion
implementation
,
math
800
x38985
1950B
Upscaling
implementation
800
x37334
1950A
Stair, Peak, or Neither?
implementation
800
x50943
1948A
Special Characters
brute force
,
constructive algorithms
800
x28254
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x25757
1945B
Fireworks
math
,
number theory
900
x22238
1945A
Setting up Camp
greedy
,
math
800
x27228
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x23411
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x17081
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x32872
1941A
Rudolf and the Ticket
brute force
,
math
800
x41915
1937A
Shuffle Party
implementation
,
math
800
x22941
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x27705
1934A
Too Min Too Max
greedy
,
math
800
x25135
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x32494
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x37790
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x29187
1931B
Make Equal
greedy
800
x31897
1931A
Recovering a Small String
brute force
,
strings
800
x35847
1930A
Maximise The Score
greedy
,
sortings
800
x18390
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x25027
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x31134
1928A
Rectangle Cutting
geometry
,
math
800
x22377
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x32759
1927A
Make it White
greedy
,
strings
800
x42577
1926B
Vlad and Shapes
geometry
,
implementation
800
x32122
1926A
Vlad and the Best of Five
implementation
800
x47164
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x28501
1923A
Moving Chips
greedy
,
implementation
800
x24452
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26838
1921C
Sending Messages
greedy
,
math
900
x29075
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