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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
41:21:20
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Difficulty:
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number theory
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
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4529
1575G
GCD Festival
math
,
number theory
2200
x635
1575C
Cyclic Sum
data structures
,
fft
,
number theory
3000
x152
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x104
1562F
Tubular Bells
interactive
,
math
,
number theory
,
probabilities
2900
x372
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19098
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5337
1559E
Mocha and Stars
combinatorics
,
dp
,
fft
,
math
,
number theory
2200
x2200
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4567
1554E
You
dfs and similar
,
dp
,
math
,
number theory
2600
x1167
1553G
Common Divisor Graph
brute force
,
constructive algorithms
,
dsu
,
graphs
,
hashing
,
math
,
number theory
2700
x965
1553A
Digits Sum
math
,
number theory
800
x29907
1552H
Guess the Perimeter
binary search
,
interactive
,
number theory
3300
x311
1549A
Gregor and Cryptography
math
,
number theory
800
x31022
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x236
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1420
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9172
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5419
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x25913
1542C
Strange Function
math
,
number theory
1600
x13369
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x21757
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x26053
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x18088
1538D
Another Problem About Dividing Numbers
constructive algorithms
,
math
,
number theory
1700
x12883
1537D
Deleting Divisors
games
,
math
,
number theory
1700
x11741
1536C
Diluc and Kaeya
data structures
,
dp
,
hashing
,
number theory
1500
x13436
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29351
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x28198
1525A
Potion-making
math
,
number theory
800
x24926
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x20575
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x34927
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42344
1519C
Berland Regional
brute force
,
data structures
,
greedy
,
number theory
,
sortings
1400
x15705
1516D
Cut
binary search
,
data structures
,
dp
,
graphs
,
number theory
,
two pointers
2100
x4051
1515G
Phoenix and Odometers
dfs and similar
,
graphs
,
math
,
number theory
2700
x904
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x23948
1514C
Product 1 Modulo N
greedy
,
number theory
1600
x14027
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23700
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x4952
1512G
Short Task
brute force
,
dp
,
math
,
number theory
1700
x7697
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21789
1510D
Digits
dp
,
math
,
number theory
2100
x1780
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x725
1505B
DMCA
*special problem
,
implementation
,
number theory
1600
x5922
1500B
Two chandeliers
binary search
,
brute force
,
chinese remainder theorem
,
math
,
number theory
2200
x1974
1499D
The Number of Pairs
dp
,
math
,
number theory
2100
x5391
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1541
1497E1
Square-Free Division (easy version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
1700
x7945
1497D
Genius
bitmasks
,
dp
,
graphs
,
number theory
2500
x1471
1493F
Enchanted Matrix
bitmasks
,
interactive
,
number theory
2600
x369
1493D
GCD of an Array
brute force
,
data structures
,
hashing
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2100
x4692
1491E
Fib-tree
brute force
,
dfs and similar
,
divide and conquer
,
number theory
,
trees
2400
x2007
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x114
1487D
Pythagorean Triples
binary search
,
brute force
,
math
,
number theory
1500
x16748
1487B
Cat Cycle
math
,
number theory
1200
x19355
1485D
Multiples and Power Differences
constructive algorithms
,
graphs
,
math
,
number theory
2200
x4904
1485C
Floor and Mod
binary search
,
brute force
,
math
,
number theory
1700
x9458
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x20439
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x172
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5622
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6333
1475A
Odd Divisor
math
,
number theory
900
x53523
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x25906
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29337
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24085
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6114
1469D
Ceil Divisions
brute force
,
constructive algorithms
,
math
,
number theory
1700
x9084
1468L
Prime Divisors Selection
binary search
,
greedy
,
math
,
number theory
2700
x307
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3535
1462D
Add to Neighbour and Remove
greedy
,
math
,
number theory
1400
x16093
1458A
Row GCD
math
,
number theory
1600
x15709
1455A
Strange Functions
math
,
number theory
800
x25921
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x19564
1444A
Division
brute force
,
math
,
number theory
1500
x12460
1436F
Sum Over Subsets
combinatorics
,
math
,
number theory
2800
x478
1427E
Xum
bitmasks
,
constructive algorithms
,
math
,
matrices
,
number theory
2500
x1251
1423K
Lonely Numbers
binary search
,
math
,
number theory
,
two pointers
1600
x4621
1422F
Boring Queries
data structures
,
math
,
number theory
2700
x949
1419E
Decryption
constructive algorithms
,
implementation
,
math
,
number theory
2100
x3116
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x346
1411B
Fair Numbers
brute force
,
number theory
1000
x17403
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22629
1407B
Big Vova
brute force
,
greedy
,
math
,
number theory
1300
x16621
1406E
Deleting Numbers
interactive
,
math
,
number theory
2600
x1500
1404D
Game of Pairs
constructive algorithms
,
dfs and similar
,
interactive
,
math
,
number theory
2800
x975
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8792
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23267
1398G
Running Competition
bitmasks
,
fft
,
math
,
number theory
2600
x752
1397B
Power Sequence
brute force
,
math
,
number theory
,
sortings
1500
x14266
1396A
Multiples of Length
constructive algorithms
,
greedy
,
number theory
1600
x14842
1389E
Calendar Ambiguity
math
,
number theory
2200
x3091
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x37876
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24484
1379B
Dubious Cyrpto
binary search
,
brute force
,
math
,
number theory
1500
x12419
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x75
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x25738
1371E2
Asterism (Hard Version)
binary search
,
combinatorics
,
dp
,
math
,
number theory
,
sortings
2300
x2287
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x4940
1370C
Number Game
games
,
math
,
number theory
1400
x23335
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x22983
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