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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
39:39:55
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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
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strings
ternary search
trees
two pointers
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Problems
#
Name
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3526
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3648
615D
Multipliers
math
,
number theory
2000
x3772
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x3924
401D
Roman and Numbers
bitmasks
,
brute force
,
combinatorics
,
dp
,
number theory
2000
x3931
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4141
1101D
GCD Counting
data structures
,
dfs and similar
,
dp
,
number theory
,
trees
2000
x4351
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4403
1513D
GCD and MST
constructive algorithms
,
dsu
,
graphs
,
greedy
,
number theory
,
sortings
2000
x4952
1359E
Modular Stability
combinatorics
,
math
,
number theory
2000
x5684
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6106
1244C
The Football Season
brute force
,
math
,
number theory
2000
x7357
1366D
Two Divisors
constructive algorithms
,
math
,
number theory
2000
x9779
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1258
279E
Beautiful Decomposition
dp
,
games
,
greedy
,
number theory
1900
x1404
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1501
1055C
Lucky Days
math
,
number theory
1900
x1839
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x1848
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x1895
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2052
1081E
Missing Numbers
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1900
x2516
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2741
359C
Prime Number
math
,
number theory
1900
x2915
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3037
1673D
Lost Arithmetic Progression
combinatorics
,
math
,
number theory
1900
x3158
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3284
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3524
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3614
1220D
Alex and Julian
bitmasks
,
math
,
number theory
1900
x3634
294C
Shaass and Lights
combinatorics
,
number theory
1900
x3690
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3727
1144E
Median String
bitmasks
,
math
,
number theory
,
strings
1900
x3882
1558B
Up the Strip
brute force
,
dp
,
math
,
number theory
,
two pointers
1900
x4567
1593D2
Half of Same
brute force
,
math
,
number theory
1900
x4747
1371E1
Asterism (Easy Version)
binary search
,
brute force
,
combinatorics
,
math
,
number theory
,
sortings
1900
x4940
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x4987
1647D
Madoka and the Best School in Russia
constructive algorithms
,
dp
,
math
,
number theory
1900
x5066
1367E
Necklace Assembly
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
number theory
1900
x5105
1744E2
Divisible Numbers (hard version)
brute force
,
math
,
number theory
1900
x5144
1749D
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
1900
x5180
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5344
1547F
Array Stabilization (GCD version)
binary search
,
brute force
,
data structures
,
divide and conquer
,
number theory
,
two pointers
1900
x5419
1470B
Strange Definition
bitmasks
,
graphs
,
hashing
,
math
,
number theory
1900
x6114
1475G
Strange Beauty
dp
,
math
,
number theory
,
sortings
1900
x6333
1656D
K-good
constructive algorithms
,
math
,
number theory
1900
x6528
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x7734
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x228
1505D
Xenolith? Hippodrome?
*special problem
,
number theory
1800
x725
117B
Very Interesting Game
brute force
,
number theory
1800
x1533
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1620
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2071
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2093
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2358
402D
Upgrading Array
dp
,
greedy
,
math
,
number theory
1800
x2508
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2525
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x2940
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3166
963A
Alternating Sum
math
,
number theory
1800
x3207
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3643
1107D
Compression
dp
,
implementation
,
math
,
number theory
1800
x3664
7C
Line
math
,
number theory
1800
x4127
1254B1
Send Boxes to Alice (Easy Version)
constructive algorithms
,
greedy
,
math
,
number theory
,
ternary search
,
two pointers
1800
x4346
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4354
1195D2
Submarine in the Rybinsk Sea (hard edition)
combinatorics
,
math
,
number theory
1800
x4399
16C
Monitor
binary search
,
number theory
1800
x4461
1010C
Border
number theory
1800
x4628
1176D
Recover it!
dfs and similar
,
graphs
,
greedy
,
number theory
,
sortings
1800
x5102
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5187
1713D
Tournament Countdown
constructive algorithms
,
greedy
,
interactive
,
number theory
,
probabilities
1800
x5393
1750D
Count GCD
combinatorics
,
math
,
number theory
1800
x5448
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5484
1477A
Nezzar and Board
constructive algorithms
,
math
,
number theory
1800
x5622
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5641
1030D
Vasya and Triangle
geometry
,
number theory
1800
x5656
1848C
Vika and Price Tags
math
,
number theory
1800
x5824
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x5938
1152C
Neko does Maths
brute force
,
math
,
number theory
1800
x6350
1225D
Power Products
hashing
,
math
,
number theory
1800
x7300
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7391
1034A
Enlarge GCD
number theory
1800
x8225
1295D
Same GCDs
math
,
number theory
1800
x8291
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x8744
1401D
Maximum Distributed Tree
dfs and similar
,
dp
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
trees
1800
x8792
1548B
Integers Have Friends
binary search
,
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
1800
x9172
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3019
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3535
439C
Devu and Partitioning of the Array
brute force
,
constructive algorithms
,
implementation
,
number theory
1700
x3787
678D
Iterated Linear Function
math
,
number theory
1700
x4192
1579F
Array Stabilization (AND version)
brute force
,
graphs
,
math
,
number theory
,
shortest paths
1700
x4529
923A
Primal Sport
math
,
number theory
1700
x4950
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5261
1561D1
Up the Strip (simplified version)
brute force
,
data structures
,
dp
,
math
,
number theory
1700
x5337
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5555
833A
The Meaningless Game
math
,
number theory
1700
x5984
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6280
1706D1
Chopping Carrots (Easy Version)
binary search
,
brute force
,
constructive algorithms
,
greedy
,
number theory
1700
x6600
1690F
Shifting String
graphs
,
math
,
number theory
,
strings
1700
x6669
1114C
Trailing Loves (or L'oeufs?)
brute force
,
implementation
,
math
,
number theory
1700
x7154
582A
GCD Table
constructive algorithms
,
greedy
,
number theory
1700
x7490
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7535
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