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Before contest
Codeforces Round 968 (Div. 2)
45:30:46
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Difficulty:
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constructive algorithms
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
2002B
Removals Game
constructive algorithms
,
games
1000
x15552
2002A
Distanced Coloring
constructive algorithms
,
implementation
,
math
800
x17056
2001B
Generate Permutation
constructive algorithms
800
x20368
1999B
Card Game
brute force
,
constructive algorithms
,
implementation
1000
x27497
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x20743
1998A
Find K Distinct Points with Fixed Center
constructive algorithms
,
implementation
,
math
800
x21691
1997C
Even Positions
constructive algorithms
,
data structures
,
greedy
1100
x19540
1997B
Make Three Regions
constructive algorithms
,
two pointers
1100
x18886
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15331
1994A
Diverse Game
constructive algorithms
,
greedy
,
implementation
800
x19110
1993B
Parity and Sum
constructive algorithms
,
greedy
1100
x20602
1992C
Gorilla and Permutation
constructive algorithms
,
math
900
x27082
1992A
Only Pluses
brute force
,
constructive algorithms
,
greedy
,
math
,
sortings
800
x38242
1991B
AND Reconstruction
bitmasks
,
constructive algorithms
,
greedy
1100
x15138
1984A
Strange Splitting
constructive algorithms
800
x20311
1983A
Array Divisibility
constructive algorithms
,
math
800
x24455
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x24445
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x16924
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x18086
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x19309
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x23821
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x14367
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x17243
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17347
1957A
Stickogon
constructive algorithms
,
greedy
800
x22630
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x26792
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x23232
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x18959
1948A
Special Characters
brute force
,
constructive algorithms
800
x27971
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x15722
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x13528
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x16929
1935A
Entertainment in MAC
constructive algorithms
,
strings
800
x27447
1930B
Permutation Printing
brute force
,
constructive algorithms
,
math
1000
x14839
1929B
Sasha and the Drawing
constructive algorithms
,
greedy
,
math
800
x24803
1929A
Sasha and the Beautiful Array
constructive algorithms
,
greedy
,
math
,
sortings
800
x30783
1927B
Following the String
constructive algorithms
,
greedy
,
strings
900
x32331
1925A
We Got Everything Covered!
constructive algorithms
,
greedy
,
strings
800
x28281
1922A
Tricky Template
constructive algorithms
,
implementation
,
strings
800
x26667
1918B
Minimize Inversions
constructive algorithms
,
data structures
,
greedy
,
implementation
,
sortings
900
x23263
1918A
Brick Wall
constructive algorithms
,
greedy
,
implementation
,
math
800
x29770
1917A
Least Product
constructive algorithms
,
math
800
x25080
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x25173
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x25380
1914B
Preparing for the Contest
constructive algorithms
,
math
800
x29828
1905A
Constructive Problems
constructive algorithms
,
math
800
x22645
1902A
Binary Imbalance
constructive algorithms
800
x20629
1900A
Cover in Water
constructive algorithms
,
greedy
,
implementation
,
strings
800
x25982
1894B
Two Out of Three
constructive algorithms
1000
x15633
1891A
Sorting with Twos
constructive algorithms
,
sortings
800
x19080
1890B
Qingshan Loves Strings
constructive algorithms
,
implementation
800
x17354
1890A
Doremy's Paint 3
constructive algorithms
800
x25328
1886A
Sum of Three
brute force
,
constructive algorithms
,
math
800
x25517
1879B
Chips on the Board
constructive algorithms
,
greedy
900
x22095
1878B
Aleksa and Stack
constructive algorithms
,
math
800
x31117
1870A
MEXanized Array
constructive algorithms
,
greedy
,
math
800
x18918
1869A
Make It Zero
constructive algorithms
900
x20799
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16560
1867A
green_gold_dog, array and permutation
constructive algorithms
,
sortings
800
x19779
1864B
Swap and Reverse
constructive algorithms
,
greedy
,
sortings
,
strings
1100
x15206
1864A
Increasing and Decreasing
constructive algorithms
,
greedy
,
implementation
,
math
800
x20159
1862B
Sequence Game
constructive algorithms
800
x31261
1861B
Two Binary Strings
constructive algorithms
,
dp
,
greedy
1000
x21081
1861A
Prime Deletion
constructive algorithms
,
math
800
x23689
1860A
Not a Substring
constructive algorithms
,
strings
900
x21499
1859B
Olya and Game with Arrays
constructive algorithms
,
greedy
,
math
,
sortings
1000
x26403
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x31541
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22807
1851A
Escalator Conversations
brute force
,
constructive algorithms
,
math
800
x29336
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x26598
1844B
Permutations & Primes
constructive algorithms
,
math
1000
x18007
1844A
Subtraction Game
constructive algorithms
,
games
800
x24413
1841A
Game with Board
constructive algorithms
,
games
800
x24593
1838B
Minimize Permutation Subarrays
constructive algorithms
,
math
1100
x16242
1838A
Blackboard List
constructive algorithms
,
math
800
x21394
1837C
Best Binary String
constructive algorithms
,
greedy
1000
x21773
1837A
Grasshopper on a Line
constructive algorithms
,
math
800
x31519
1831B
Array merging
constructive algorithms
,
greedy
1000
x20195
1831A
Twin Permutations
constructive algorithms
800
x26155
1828A
Divisible Array
constructive algorithms
,
math
800
x23488
1823A
A-characteristic
combinatorics
,
constructive algorithms
,
math
800
x16052
1818B
Indivisible
constructive algorithms
900
x14698
1816B
Grid Reconstruction
constructive algorithms
,
greedy
1000
x15123
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x17486
1811C
Restore the Array
constructive algorithms
,
greedy
1100
x19589
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17388
1806B
Mex Master
constructive algorithms
,
greedy
900
x17538
1797B
Li Hua and Pattern
constructive algorithms
,
greedy
1100
x15653
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x17300
1794B
Not Dividing
constructive algorithms
,
greedy
,
math
900
x21550
1793B
Fedya and Array
constructive algorithms
,
math
1100
x15670
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x19826
1787A
Exponential Equation
constructive algorithms
,
math
800
x19047
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x17650
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x29343
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21553
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x23423
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x23075
1775A2
Gardener and the Capybaras (hard version)
constructive algorithms
,
greedy
900
x18603
1775A1
Gardener and the Capybaras (easy version)
brute force
,
constructive algorithms
,
implementation
800
x19563
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