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Problems
#
Name
804F
Fake bullions
combinatorics
,
dfs and similar
,
dp
,
graphs
,
number theory
3400
x138
803F
Coprime Subsequences
bitmasks
,
combinatorics
,
number theory
2000
x3045
798C
Mike and gcd problem
dp
,
greedy
,
number theory
1700
x5646
797A
k-Factorization
implementation
,
math
,
number theory
1100
x14201
792E
Colored Balls
greedy
,
math
,
number theory
2500
x1047
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4239
787A
The Monster
brute force
,
math
,
number theory
1200
x11075
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2659
776E
The Holmes Children
math
,
number theory
2100
x2106
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x19543
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x173
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x104
774E
Big Number and Remainder
*special problem
,
math
,
number theory
2300
x206
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x185
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1190
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x1000
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x31336
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x81
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x705
762A
k-th divisor
math
,
number theory
1400
x18247
758F
Geometrical Progression
brute force
,
math
,
number theory
2400
x621
758B
Blown Garland
brute force
,
implementation
,
number theory
1100
x10076
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1269
757B
Bash's Big Day
greedy
,
math
,
number theory
1400
x9925
756F
Long number
expression parsing
,
math
,
number theory
3400
x89
755G
PolandBall and Many Other Balls
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3200
x869
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17583
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x46893
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x11902
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9077
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x40199
735D
Taxes
math
,
number theory
1600
x12822
735B
Urbanization
greedy
,
number theory
,
sortings
1100
x8310
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2766
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x1004
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2116
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x473
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x334
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1245
710D
Two Arithmetic Progressions
math
,
number theory
2500
x1166
707C
Pythagorean Triples
math
,
number theory
1500
x12323
703E
Mishka and Divisors
dp
,
number theory
2600
x588
698F
Coprime Permutation
combinatorics
,
number theory
3000
x432
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1250
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5592
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20663
678D
Iterated Linear Function
math
,
number theory
1700
x4304
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x9113
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x664
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x579
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3219
664A
Complicated GCD
math
,
number theory
800
x17511
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8574
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x949
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x517
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x760
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x723
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6554
633A
Ebony and Ivory
brute force
,
math
,
number theory
1100
x12389
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3430
630K
Indivisibility
math
,
number theory
1500
x5063
630J
Divisibility
math
,
number theory
1100
x10729
630A
Again Twenty Five!
number theory
800
x62621
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4297
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2052
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5307
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x2717
615D
Multipliers
math
,
number theory
2000
x3812
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2539
594D
REQ
data structures
,
number theory
2500
x1520
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1046
585C
Alice, Bob, Oranges and Apples
number theory
2400
x965
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x8876
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x609
582C
Superior Periodic Subarrays
number theory
2400
x727
582A
GCD Table
constructive algorithms
,
greedy
,
number theory
1700
x7561
577A
Multiplication Table
implementation
,
number theory
1000
x38306
576A
Vasya and Petya's Game
math
,
number theory
1500
x13409
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1637
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16327
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x5005
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3533
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6188
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5395
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1725
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2730
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x11302
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x498
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1811
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19363
516E
Drazil and His Happy Friends
math
,
number theory
3100
x477
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7370
500G
New Year Running
number theory
,
trees
3200
x157
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1065
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3316
495B
Modular Equations
math
,
number theory
1600
x6559
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2072
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x8920
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x2521
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22317
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