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Before contest
Codeforces Round 943 (Div. 3)
09:46:24
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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
792C
Divide by Three
dp
,
greedy
,
math
,
number theory
2000
x4187
787A
The Monster
brute force
,
math
,
number theory
1200
x11028
785D
Anton and School - 2
combinatorics
,
dp
,
math
,
number theory
2300
x2641
776E
The Holmes Children
math
,
number theory
2100
x2100
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x19252
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
x184
772C
Vulnerable Kerbals
constructive algorithms
,
dp
,
graphs
,
math
,
number theory
2300
x1183
768F
Barrels and boxes
brute force
,
combinatorics
,
math
,
number theory
,
probabilities
2300
x998
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x31046
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x80
763C
Timofey and remoduling
brute force
,
implementation
,
math
,
number theory
2600
x703
762A
k-th divisor
math
,
number theory
1400
x17908
758F
Geometrical Progression
brute force
,
math
,
number theory
2400
x616
758B
Blown Garland
brute force
,
implementation
,
number theory
1100
x10035
757E
Bash Plays with Functions
brute force
,
combinatorics
,
dp
,
number theory
2500
x1265
757B
Bash's Big Day
greedy
,
math
,
number theory
1400
x9801
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
x857
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17505
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x46371
743C
Vladik and fractions
brute force
,
constructive algorithms
,
math
,
number theory
1500
x11819
742B
Arpa’s obvious problem and Mehrdad’s terrible solution
brute force
,
math
,
number theory
1500
x9024
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x39781
735D
Taxes
math
,
number theory
1600
x12630
735B
Urbanization
greedy
,
number theory
,
sortings
1100
x8300
731F
Video Cards
brute force
,
data structures
,
implementation
,
math
,
number theory
1900
x2750
724G
Xor-matic Number of the Graph
bitmasks
,
graphs
,
math
,
number theory
,
trees
2600
x994
724C
Ray Tracing
greedy
,
hashing
,
implementation
,
math
,
number theory
,
sortings
1800
x2107
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x469
717A
Festival Organization
combinatorics
,
math
,
number theory
2900
x333
711E
ZS and The Birthday Paradox
math
,
number theory
,
probabilities
2300
x1241
710D
Two Arithmetic Progressions
math
,
number theory
2500
x1156
707C
Pythagorean Triples
math
,
number theory
1500
x12273
703E
Mishka and Divisors
dp
,
number theory
2600
x585
698F
Coprime Permutation
combinatorics
,
number theory
3000
x428
691F
Couple Cover
brute force
,
dp
,
number theory
2200
x1245
687B
Remainders Game
chinese remainder theorem
,
math
,
number theory
1800
x5541
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20435
678D
Iterated Linear Function
math
,
number theory
1700
x4265
678C
Joty and Chocolate
implementation
,
math
,
number theory
1600
x8929
671C
Ultimate Weirdness of an Array
data structures
,
number theory
2800
x662
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x576
665D
Simple Subset
constructive algorithms
,
greedy
,
number theory
1800
x3200
664A
Complicated GCD
math
,
number theory
800
x17384
660A
Co-prime Array
greedy
,
implementation
,
math
,
number theory
1200
x8518
659G
Fence Divercity
combinatorics
,
dp
,
number theory
2300
x947
653G
Move by Prime
combinatorics
,
math
,
number theory
3100
x514
645F
Cowslip Collections
combinatorics
,
math
,
number theory
2500
x757
633G
Yash And Trees
bitmasks
,
data structures
,
dfs and similar
,
math
,
number theory
2800
x715
633B
A Trivial Problem
brute force
,
constructive algorithms
,
math
,
number theory
1300
x6537
633A
Ebony and Ivory
brute force
,
math
,
number theory
1100
x12292
632D
Longest Subsequence
brute force
,
math
,
number theory
2100
x3368
630K
Indivisibility
math
,
number theory
1500
x5022
630J
Divisibility
math
,
number theory
1100
x10670
630A
Again Twenty Five!
number theory
800
x61804
626C
Block Towers
brute force
,
greedy
,
math
,
number theory
1600
x4286
623B
Array GCD
dp
,
greedy
,
number theory
2300
x2040
621C
Wet Shark and Flowers
combinatorics
,
math
,
number theory
,
probabilities
1700
x5283
616E
Sum of Remainders
implementation
,
math
,
number theory
2200
x2664
615D
Multipliers
math
,
number theory
2000
x3783
603B
Moodular Arithmetic
combinatorics
,
dfs and similar
,
dsu
,
math
,
number theory
1800
x2534
594D
REQ
data structures
,
number theory
2500
x1505
585E
Present for Vitalik the Philatelist
combinatorics
,
math
,
number theory
2900
x1041
585C
Alice, Bob, Oranges and Apples
number theory
2400
x961
584D
Dima and Lisa
brute force
,
math
,
number theory
1800
x8812
582D
Number of Binominal Coefficients
dp
,
math
,
number theory
3300
x606
582C
Superior Periodic Subarrays
number theory
2400
x725
582A
GCD Table
constructive algorithms
,
greedy
,
number theory
1700
x7538
577A
Multiplication Table
implementation
,
number theory
1000
x38012
576A
Vasya and Petya's Game
math
,
number theory
1500
x13156
575H
Bots
combinatorics
,
dp
,
math
,
number theory
1800
x1630
573A
Bear and Poker
implementation
,
math
,
number theory
1300
x16283
568A
Primes or Palindromes?
brute force
,
implementation
,
math
,
number theory
1600
x4998
566F
Clique in the Divisibility Graph
dp
,
math
,
number theory
1500
x3516
559C
Gerald and Giant Chess
combinatorics
,
dp
,
math
,
number theory
2200
x6133
552C
Vanya and Scales
brute force
,
dp
,
greedy
,
math
,
meet-in-the-middle
,
number theory
1900
x5381
551D
GukiZ and Binary Operations
combinatorics
,
implementation
,
math
,
matrices
,
number theory
2100
x1723
547C
Mike and Foam
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
2300
x2701
546D
Soldier and Number Game
constructive algorithms
,
dp
,
math
,
number theory
1700
x11201
542D
Superhero's Job
dfs and similar
,
dp
,
hashing
,
math
,
number theory
2600
x495
520E
Pluses everywhere
combinatorics
,
dp
,
math
,
number theory
2200
x1797
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19319
516E
Drazil and His Happy Friends
math
,
number theory
3100
x471
515B
Drazil and His Happy Friends
brute force
,
dsu
,
meet-in-the-middle
,
number theory
1300
x7357
500G
New Year Running
number theory
,
trees
3200
x155
498D
Traffic Jams in the Land
data structures
,
dp
,
number theory
2400
x1061
498C
Array and Operations
flows
,
graph matchings
,
number theory
2100
x3276
495B
Modular Equations
math
,
number theory
1600
x6449
490D
Chocolate
brute force
,
dfs and similar
,
math
,
meet-in-the-middle
,
number theory
1900
x2069
490C
Hacking Cypher
brute force
,
math
,
number theory
,
strings
1700
x8899
487C
Prefix Product Sequence
constructive algorithms
,
math
,
number theory
2300
x2509
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22169
474F
Ant colony
data structures
,
math
,
number theory
2100
x7665
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56910
463E
Caisa and Tree
brute force
,
dfs and similar
,
math
,
number theory
,
trees
2100
x1384
460B
Little Dima and Equation
brute force
,
implementation
,
math
,
number theory
1500
x12080
456B
Fedya and Maths
math
,
number theory
1200
x15979
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