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Codeforces Round #851 (Div. 2)
2 days
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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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Custom test
Problems
#
Name
266B
Queue at the School
constructive algorithms
,
graph matchings
,
implementation
,
shortest paths
800
x101381
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x69241
443A
Anton and Letters
constructive algorithms
,
implementation
800
x65988
732A
Buy a Shovel
brute force
,
constructive algorithms
,
implementation
,
math
800
x52850
1343B
Balanced Array
constructive algorithms
,
math
800
x45094
1353A
Most Unstable Array
constructive algorithms
,
greedy
,
math
800
x34815
1454A
Special Permutation
constructive algorithms
,
probabilities
800
x34677
1335B
Construct the String
constructive algorithms
900
x32486
1325A
EhAb AnD gCd
constructive algorithms
,
greedy
,
number theory
800
x32473
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x32125
1337A
Ichihime and Triangle
constructive algorithms
,
math
800
x31088
467B
Fedor and New Game
bitmasks
,
brute force
,
constructive algorithms
,
implementation
1100
x30158
478B
Random Teams
combinatorics
,
constructive algorithms
,
greedy
,
math
1300
x30013
1372A
Omkar and Completion
constructive algorithms
,
implementation
800
x29363
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x28929
1690A
Print a Pedestal (Codeforces logo?)
constructive algorithms
,
greedy
800
x28832
686A
Free Ice Cream
constructive algorithms
,
implementation
800
x28607
1352B
Same Parity Summands
constructive algorithms
,
math
1200
x28577
1702A
Round Down the Price
constructive algorithms
800
x28540
1476A
K-divisible Sum
binary search
,
constructive algorithms
,
greedy
,
math
1000
x27982
1360C
Similar Pairs
constructive algorithms
,
graph matchings
,
greedy
,
sortings
1100
x27865
1529A
Eshag Loves Big Arrays
constructive algorithms
,
greedy
,
math
800
x27256
1611A
Make Even
constructive algorithms
,
math
800
x27021
1541A
Pretty Permutations
constructive algorithms
,
greedy
,
implementation
800
x26509
1520C
Not Adjacent Matrix
constructive algorithms
1000
x26311
1326A
Bad Ugly Numbers
constructive algorithms
,
number theory
1000
x25899
1626A
Equidistant Letters
constructive algorithms
,
sortings
800
x25861
1400A
String Similarity
constructive algorithms
,
strings
800
x25185
1196A
Three Piles of Candies
brute force
,
constructive algorithms
,
math
800
x25106
688B
Lovely Palindromes
constructive algorithms
,
math
1000
x24841
1401A
Distance and Axis
constructive algorithms
,
math
900
x24785
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x24757
1537B
Bad Boy
constructive algorithms
,
greedy
,
math
900
x24087
1335D
Anti-Sudoku
constructive algorithms
,
implementation
1300
x24027
1433C
Dominant Piranha
constructive algorithms
,
greedy
900
x23916
1509A
Average Height
constructive algorithms
800
x23673
1611B
Team Composition: Programmers and Mathematicians
binary search
,
constructive algorithms
,
math
800
x23621
118B
Present from Lena
constructive algorithms
,
implementation
1000
x23603
766A
Mahmoud and Longest Uncommon Subsequence
constructive algorithms
,
strings
1000
x23333
1469A
Regular Bracket Sequence
constructive algorithms
,
greedy
1000
x23306
1559A
Mocha and Math
bitmasks
,
constructive algorithms
,
math
900
x23158
1391A
Suborrays
constructive algorithms
,
math
800
x23139
1490B
Balanced Remainders
brute force
,
constructive algorithms
,
math
1000
x23074
1339B
Sorted Adjacent Differences
constructive algorithms
,
sortings
1200
x22997
1365B
Trouble Sort
constructive algorithms
,
implementation
1300
x22985
1711A
Perfect Permutation
constructive algorithms
800
x22828
1674A
Number Transformation
constructive algorithms
,
math
800
x22797
1333A
Little Artem
constructive algorithms
1000
x22716
1627A
Not Shading
constructive algorithms
,
implementation
800
x22502
1526A
Mean Inequality
constructive algorithms
,
sortings
800
x22498
1621A
Stable Arrangement of Rooks
constructive algorithms
800
x22443
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22340
1467A
Wizard of Orz
constructive algorithms
,
greedy
,
math
900
x22304
1699A
The Third Three Number Problem
constructive algorithms
,
math
800
x21922
1348B
Phoenix and Beauty
constructive algorithms
,
data structures
,
greedy
,
sortings
1400
x21881
1525B
Permutation Sort
constructive algorithms
,
greedy
900
x21850
1342B
Binary Period
constructive algorithms
,
strings
1100
x21801
1537C
Challenging Cliffs
constructive algorithms
,
greedy
,
implementation
,
math
1200
x21679
1715A
Crossmarket
constructive algorithms
,
greedy
,
math
800
x21639
1741B
Funny Permutation
constructive algorithms
,
math
800
x21622
1684A
Digit Minimization
constructive algorithms
,
games
,
math
,
strings
800
x21582
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x21532
1747A
Two Groups
constructive algorithms
,
greedy
800
x21528
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x21513
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x21491
1312B
Bogosort
constructive algorithms
,
sortings
1000
x21420
768A
Oath of the Night's Watch
constructive algorithms
,
sortings
900
x21084
1665A
GCD vs LCM
constructive algorithms
,
math
800
x21025
1706A
Another String Minimization Problem
2-sat
,
constructive algorithms
,
greedy
,
string suffix structures
,
strings
800
x21007
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x20974
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x20833
1700A
Optimal Path
constructive algorithms
,
greedy
,
math
800
x20789
1367C
Social Distance
constructive algorithms
,
greedy
,
math
1300
x20699
1405A
Permutation Forgery
constructive algorithms
800
x20671
1419D1
Sage's Birthday (easy version)
binary search
,
constructive algorithms
,
greedy
,
sortings
1000
x20645
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x20489
1527B1
Palindrome Game (easy version)
constructive algorithms
,
games
1200
x20482
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x20436
1758A
SSeeeeiinngg DDoouubbllee
constructive algorithms
,
strings
800
x20401
1638A
Reverse
constructive algorithms
,
greedy
,
math
800
x20252
1499A
Domino on Windowsill
combinatorics
,
constructive algorithms
,
math
800
x20200
1497C1
k-LCM (easy version)
constructive algorithms
,
math
1200
x20185
1716B
Permutation Chain
constructive algorithms
,
math
800
x20148
1504A
Déjà Vu
constructive algorithms
,
strings
800
x20135
1574A
Regular Bracket Sequences
constructive algorithms
800
x20042
1430C
Numbers on Whiteboard
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1000
x19942
680B
Bear and Finding Criminals
constructive algorithms
,
implementation
1000
x19929
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x19876
1401B
Ternary Sequence
constructive algorithms
,
greedy
,
math
1100
x19817
1743B
Permutation Value
constructive algorithms
,
greedy
800
x19783
1365C
Rotation Matching
constructive algorithms
,
data structures
,
greedy
,
implementation
1400
x19666
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x19577
1705B
Mark the Dust Sweeper
constructive algorithms
,
greedy
,
implementation
900
x19539
1698B
Rising Sand
constructive algorithms
,
greedy
,
implementation
800
x19518
4B
Before an Exam
constructive algorithms
,
greedy
1200
x19502
1644B
Anti-Fibonacci Permutation
brute force
,
constructive algorithms
,
implementation
800
x19489
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x19464
1405B
Array Cancellation
constructive algorithms
,
implementation
1000
x19329
1774A
Add Plus Minus Sign
constructive algorithms
,
math
800
x19309
1536A
Omkar and Bad Story
brute force
,
constructive algorithms
800
x19307
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