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number theory
combine-tags-by-or
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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
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shortest paths
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string suffix structures
strings
ternary search
trees
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Custom test
Problems
#
Name
122A
Lucky Division
brute force
,
number theory
1000
x116670
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x70322
630A
Again Twenty Five!
number theory
800
x62382
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x57200
1475A
Odd Divisor
math
,
number theory
900
x55636
313A
Ilya and Bank Account
implementation
,
number theory
900
x53783
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x49073
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x46758
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x43039
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x40073
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x38555
1899A
Game with Integers
games
,
math
,
number theory
800
x38411
1325A
EhAb AnD gCd
constructive algorithms
,
greedy
,
number theory
800
x38323
577A
Multiplication Table
implementation
,
number theory
1000
x38230
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x35480
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x32470
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31763
1549A
Gregor and Cryptography
math
,
number theory
800
x31438
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x31246
1360D
Buying Shovels
math
,
number theory
1300
x30922
1553A
Digits Sum
math
,
number theory
800
x30208
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30147
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29781
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29674
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x29528
1326A
Bad Ugly Numbers
constructive algorithms
,
number theory
1000
x29499
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x28858
26A
Almost Prime
number theory
900
x28770
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x28063
1968A
Maximize?
brute force
,
math
,
number theory
800
x27705
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26971
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26848
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x26628
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x26580
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x26524
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x26247
1455A
Strange Functions
math
,
number theory
800
x26051
1312A
Two Regular Polygons
geometry
,
greedy
,
math
,
number theory
800
x25351
1324A
Yet Another Tetris Problem
implementation
,
number theory
900
x25334
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25193
1525A
Potion-making
math
,
number theory
800
x25085
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24740
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24633
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24618
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24560
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x24203
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23996
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23820
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23781
1370C
Number Game
games
,
math
,
number theory
1400
x23599
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23477
1238A
Prime Subtraction
math
,
number theory
900
x23328
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x23117
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x23008
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22763
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22491
1108B
Divisors of Two Integers
brute force
,
greedy
,
math
,
number theory
1100
x22470
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22276
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x22140
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x22138
1872C
Non-coprime Split
math
,
number theory
1100
x22135
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x22033
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22021
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x22005
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x21840
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21798
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21279
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x20939
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x20924
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x20803
1828B
Permutation Swap
math
,
number theory
900
x20795
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20687
1350B
Orac and Models
dp
,
math
,
number theory
1400
x20680
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20596
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x20570
1605A
A.M. Deviation
math
,
number theory
800
x20357
1945B
Fireworks
math
,
number theory
900
x19939
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x19872
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x19776
1487B
Cat Cycle
math
,
number theory
1200
x19750
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19641
1593D1
All are Same
math
,
number theory
1100
x19616
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x19436
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19351
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19195
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19176
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x18592
1932B
Chaya Calendar
number theory
1100
x18575
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18547
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x18414
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18382
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18348
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x18236
762A
k-th divisor
math
,
number theory
1400
x18164
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17988
1411B
Fair Numbers
brute force
,
number theory
1000
x17890
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17555
664A
Complicated GCD
math
,
number theory
800
x17467
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x17339
1736B
Playing with GCD
math
,
number theory
1200
x17303
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