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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
22:52:12
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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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Custom test
Problems
#
Name
961G
Partitions
combinatorics
,
math
,
number theory
2700
x1367
959D
Mahmoud and Ehab and another array construction task
constructive algorithms
,
greedy
,
math
,
number theory
1900
x3101
955C
Sad powers
binary search
,
math
,
number theory
2100
x2717
946B
Weird Subtraction Process
math
,
number theory
1100
x10903
937B
Vile Grasshoppers
brute force
,
math
,
number theory
1400
x6918
926B
Add Points
math
,
number theory
1800
x1715
923A
Primal Sport
math
,
number theory
1700
x5039
922F
Divisibility
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x646
922C
Cave Painting
brute force
,
number theory
1600
x7144
920G
List Of Integers
binary search
,
bitmasks
,
brute force
,
combinatorics
,
math
,
number theory
2200
x1761
920F
SUM and REPLACE
brute force
,
data structures
,
dsu
,
number theory
2000
x6916
919E
Congruence Equation
chinese remainder theorem
,
math
,
number theory
2100
x2142
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x28397
915G
Coprime Arrays
math
,
number theory
2300
x1293
914D
Bash and a Tough Math Puzzle
data structures
,
number theory
1900
x5359
913G
Power Substring
math
,
number theory
3200
x209
912E
Prime Gift
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
,
two pointers
2400
x1628
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x12126
906D
Power Tower
chinese remainder theorem
,
math
,
number theory
2700
x2143
900D
Unusual Sequences
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2000
x3269
900B
Position in Fraction
math
,
number theory
1300
x7866
898B
Proper Nutrition
brute force
,
implementation
,
number theory
1100
x9611
896D
Nephren Runs a Cinema
chinese remainder theorem
,
combinatorics
,
math
,
number theory
2900
x537
894B
Ralph And His Magic Field
combinatorics
,
constructive algorithms
,
math
,
number theory
1800
x4483
893E
Counting Arrays
combinatorics
,
dp
,
math
,
number theory
2000
x3720
891A
Pride
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10306
876B
Divisiblity of Differences
implementation
,
math
,
number theory
1300
x9222
870F
Paths
data structures
,
number theory
2700
x621
870C
Maximum splitting
dp
,
greedy
,
math
,
number theory
1300
x9232
858A
k-rounding
brute force
,
math
,
number theory
1100
x8094
852F
Product transformation
combinatorics
,
math
,
number theory
2200
x578
850B
Arpa and a list of numbers
implementation
,
number theory
2100
x2033
842C
Ilya And The Tree
dfs and similar
,
graphs
,
math
,
number theory
,
trees
2000
x3504
840A
Leha and Function
combinatorics
,
greedy
,
math
,
number theory
,
sortings
1300
x7008
839D
Winter is here
combinatorics
,
dp
,
math
,
number theory
2200
x2983
838D
Airplane Arrangements
math
,
number theory
2700
x916
833A
The Meaningless Game
math
,
number theory
1700
x6216
830C
Bamboo Partition
brute force
,
data structures
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2300
x1205
822D
My pretty girl Noora
brute force
,
dp
,
greedy
,
math
,
number theory
1800
x3105
822A
I'm bored with life
implementation
,
math
,
number theory
800
x33420
819D
Mister B and Astronomers
number theory
2900
x277
819C
Mister B and Beacons on Field
number theory
2900
x211
818E
Card Game Again
binary search
,
data structures
,
number theory
,
two pointers
1900
x2285
817A
Treasure Hunt
implementation
,
math
,
number theory
1200
x6270
809E
Surprise me!
divide and conquer
,
math
,
number theory
,
trees
3100
x736
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x164
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3352
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5840
797A
k-Factorization
implementation
,
math
,
number theory
1100
x15646
792E
Colored Balls
greedy
,
math
,
number theory
2500
x1095
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4433
787A
The Monster
brute force
,
math
,
number theory
1200
x11458
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x3006
776E
The Holmes Children
math
,
number theory
2100
x2199
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x21155
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x183
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x109
774E
Big Number and Remainder
*special problem
,
math
,
number theory
2300
x218
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x189
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1389
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x1032
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x33218
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x86
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x713
762A
k-th divisor
math
,
number theory
1400
x20117
758F
Geometrical Progression
brute force
,
math
,
number theory
2400
x638
758B
Blown Garland
brute force
,
implementation
,
number theory
1100
x10222
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1338
757B
Bash's Big Day
greedy
,
math
,
number theory
1400
x10314
756F
Long number
expression parsing
,
math
,
number theory
3400
x99
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x923
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x18159
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x49990
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x12377
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9315
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x43108
735D
Taxes
math
,
number theory
1600
x13618
735B
Urbanization
greedy
,
number theory
,
sortings
1100
x8401
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2879
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x1076
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2145
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x522
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x369
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1277
710D
Two Arithmetic Progressions
math
,
number theory
2500
x1365
707C
Pythagorean Triples
math
,
number theory
1500
x12698
703E
Mishka and Divisors
dp
,
number theory
2600
x601
698F
Coprime Permutation
combinatorics
,
number theory
3000
x438
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1308
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5951
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x21851
678D
Iterated Linear Function
math
,
number theory
1700
x4569
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9552
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x688
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x622
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3595
664A
Complicated GCD
math
,
number theory
800
x18399
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x9045
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x1208
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x558
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