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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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number theory
combine-tags-by-or
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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
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strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16886
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x16881
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x16761
235A
LCM Challenge
number theory
1600
x16721
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16654
1609A
Divide and Multiply
greedy
,
implementation
,
math
,
number theory
900
x16625
1051B
Relatively Prime Pairs
greedy
,
math
,
number theory
1000
x16444
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x16423
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16258
1462D
Add to Neighbour and Remove
greedy
,
math
,
number theory
1400
x16170
1762B
Make Array Good
constructive algorithms
,
implementation
,
number theory
,
sortings
1100
x16135
1603A
Di-visible Confusion
constructive algorithms
,
math
,
number theory
1300
x16069
456B
Fedya and Maths
math
,
number theory
1200
x15944
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x15879
1458A
Row GCD
math
,
number theory
1600
x15864
1349A
Orac and LCM
data structures
,
math
,
number theory
1600
x15824
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x15725
1826B
Lunatic Never Content
math
,
number theory
1100
x15575
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15463
1764B
Doremy's Perfect Math Class
math
,
number theory
900
x15194
1344A
Hilbert's Hotel
math
,
number theory
,
sortings
1600
x15166
1714E
Add Modulo 10
brute force
,
math
,
number theory
1400
x15114
1165D
Almost All Divisors
math
,
number theory
1600
x14949
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x14944
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x14918
1107B
Digital root
math
,
number theory
1000
x14771
1277B
Make Them Odd
greedy
,
number theory
1200
x14585
84A
Toy Army
math
,
number theory
900
x14515
1149A
Prefix Sum Primes
constructive algorithms
,
greedy
,
math
,
number theory
1200
x14512
1732A
Bestie
brute force
,
combinatorics
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x14362
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14328
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x14146
1881D
Divide and Equalize
math
,
number theory
1300
x14136
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x13985
1245A
Good ol' Numbers Coloring
math
,
number theory
1000
x13865
797A
k-Factorization
implementation
,
math
,
number theory
1100
x13853
1606C
Banknotes
greedy
,
number theory
1400
x13690
1342C
Yet Another Counting Problem
math
,
number theory
1600
x13574
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13572
1583A
Windblume Ode
math
,
number theory
800
x13522
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13493
1305C
Kuroni and Impossible Calculation
brute force
,
combinatorics
,
math
,
number theory
1600
x13469
1542C
Strange Function
math
,
number theory
1600
x13459
236B
Easy Number Challenge
implementation
,
number theory
1300
x13386
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13337
1263C
Everyone is a Winner!
binary search
,
math
,
meet-in-the-middle
,
number theory
1400
x13271
1581A
CQXYM Count Permutations
combinatorics
,
math
,
number theory
800
x13223
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x13129
576A
Vasya and Petya's Game
math
,
number theory
1500
x13128
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x13055
1603B
Moderate Modular Mode
constructive algorithms
,
math
,
number theory
1600
x13032
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x12979
1758C
Almost All Multiples
greedy
,
number theory
1400
x12826
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12701
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x12641
735D
Taxes
math
,
number theory
1600
x12597
1444A
Division
brute force
,
math
,
number theory
1500
x12507
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12506
1076B
Divisor Subtraction
implementation
,
math
,
number theory
1200
x12497
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12450
1765M
Minimum LCM
math
,
number theory
1000
x12413
271B
Prime Matrix
binary search
,
brute force
,
math
,
number theory
1300
x12320
1133B
Preparation for International Women's Day
math
,
number theory
1200
x12309
633A
Ebony and Ivory
brute force
,
math
,
number theory
1100
x12268
707C
Pythagorean Triples
math
,
number theory
1500
x12258
1242A
Tile Painting
constructive algorithms
,
math
,
number theory
1500
x12253
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x12069
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12064
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12036
1753B
Factorial Divisibility
math
,
number theory
1600
x11956
1759D
Make It Round
brute force
,
number theory
1400
x11940
75C
Modified GCD
binary search
,
number theory
1600
x11930
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x11808
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x11793
1174C
Ehab and a Special Coloring Problem
constructive algorithms
,
number theory
1300
x11770
1673C
Palindrome Basis
brute force
,
dp
,
math
,
number theory
1500
x11606
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11604
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11599
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11554
1325D
Ehab the Xorcist
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1700
x11495
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11460
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11435
1220B
Multiplication Table
math
,
number theory
1300
x11323
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11293
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x11170
1166B
All the Vowels Please
constructive algorithms
,
math
,
number theory
1100
x11106
1068B
LCM
math
,
number theory
1200
x11025
787A
The Monster
brute force
,
math
,
number theory
1200
x11020
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x10901
371B
Fox Dividing Cheese
math
,
number theory
1300
x10871
1133D
Zero Quantity Maximization
hashing
,
math
,
number theory
1500
x10729
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10675
946B
Weird Subtraction Process
math
,
number theory
1100
x10650
630J
Divisibility
math
,
number theory
1100
x10639
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10529
1744E1
Divisible Numbers (easy version)
brute force
,
math
,
number theory
1500
x10136
758B
Blown Garland
brute force
,
implementation
,
number theory
1100
x10021
1877C
Joyboard
math
,
number theory
1200
x9950
1143B
Nirvana
brute force
,
math
,
number theory
1200
x9882
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x9845
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