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Contest is running
Codeforces Round 942 (Div. 1)
01:29:01
Contest is running
Codeforces Round 942 (Div. 2)
01:29:00
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number theory
combine-tags-by-or
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2-sat
binary search
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brute force
chinese remainder theorem
combinatorics
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data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
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geometry
graph matchings
graphs
greedy
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implementation
interactive
math
matrices
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Problems
#
Name
122A
Lucky Division
brute force
,
number theory
1000
x115724
230B
T-primes
binary search
,
implementation
,
math
,
number theory
1300
x69678
630A
Again Twenty Five!
number theory
800
x61772
472A
Design Tutorial: Learn from Math
math
,
number theory
800
x56887
1475A
Odd Divisor
math
,
number theory
900
x54936
313A
Ilya and Bank Account
implementation
,
number theory
900
x53469
1370A
Maximum GCD
greedy
,
implementation
,
math
,
number theory
800
x48601
749A
Bachgold Problem
greedy
,
implementation
,
math
,
number theory
800
x46348
1520B
Ordinary Numbers
brute force
,
math
,
number theory
800
x42716
742A
Arpa’s hard exam and Mehrdad’s naive cheat
implementation
,
math
,
number theory
1000
x39760
1389A
LCM Problem
constructive algorithms
,
greedy
,
math
,
number theory
800
x38259
1325A
EhAb AnD gCd
constructive algorithms
,
greedy
,
number theory
800
x38066
577A
Multiplication Table
implementation
,
number theory
1000
x37996
1899A
Game with Integers
games
,
math
,
number theory
800
x37423
1521A
Nastia and Nearly Good Numbers
constructive algorithms
,
math
,
number theory
1000
x35263
1294C
Product of Three Numbers
greedy
,
math
,
number theory
1300
x32209
822A
I'm bored with life
implementation
,
math
,
number theory
800
x31627
1549A
Gregor and Cryptography
math
,
number theory
800
x31277
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x31034
1360D
Buying Shovels
math
,
number theory
1300
x30708
1553A
Digits Sum
math
,
number theory
800
x30087
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x29638
1473B
String LCM
brute force
,
math
,
number theory
,
strings
1000
x29620
1535B
Array Reodering
brute force
,
greedy
,
math
,
number theory
,
sortings
900
x29541
1326A
Bad Ugly Numbers
constructive algorithms
,
number theory
1000
x29363
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x29134
1526B
I Hate 1111
dp
,
math
,
number theory
1400
x28592
26A
Almost Prime
number theory
900
x28452
1768A
Greatest Convex
greedy
,
math
,
number theory
800
x27944
919B
Perfect Number
binary search
,
brute force
,
dp
,
implementation
,
number theory
1100
x26813
1364A
XXXXX
brute force
,
data structures
,
number theory
,
two pointers
1200
x26754
1541B
Pleasant Pairs
brute force
,
implementation
,
math
,
number theory
1200
x26401
1543A
Exciting Bets
greedy
,
math
,
number theory
900
x26311
1474B
Different Divisors
binary search
,
constructive algorithms
,
greedy
,
math
,
number theory
1000
x26253
1372B
Omkar and Last Class of Math
greedy
,
math
,
number theory
1300
x26092
1455A
Strange Functions
math
,
number theory
800
x25986
1312A
Two Regular Polygons
geometry
,
greedy
,
math
,
number theory
800
x25307
1324A
Yet Another Tetris Problem
implementation
,
number theory
900
x25275
1525A
Potion-making
math
,
number theory
800
x25049
199A
Hexadecimal's theorem
brute force
,
constructive algorithms
,
implementation
,
number theory
900
x25019
1388A
Captain Flint and Crew Recruitment
brute force
,
greedy
,
math
,
number theory
800
x24535
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24458
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24456
1471A
Strange Partition
greedy
,
math
,
number theory
900
x24436
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x24096
1514A
Perfectly Imperfect Array
math
,
number theory
800
x23774
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23630
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23504
1370C
Number Game
games
,
math
,
number theory
1400
x23500
1401C
Mere Array
constructive algorithms
,
math
,
number theory
,
sortings
1300
x23402
1238A
Prime Subtraction
math
,
number theory
900
x23245
1370B
GCD Compression
constructive algorithms
,
math
,
number theory
1100
x23064
1629B
GCD Arrays
greedy
,
math
,
number theory
800
x22949
1409C
Yet Another Array Restoration
brute force
,
math
,
number theory
1200
x22718
1108B
Divisors of Two Integers
brute force
,
greedy
,
math
,
number theory
1100
x22367
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22362
483A
Counterexample
brute force
,
implementation
,
math
,
number theory
1100
x22153
1542B
Plus and Multiply
constructive algorithms
,
math
,
number theory
1500
x22006
1511B
GCD Length
constructive algorithms
,
math
,
number theory
1100
x21938
1285C
Fadi and LCM
brute force
,
math
,
number theory
1400
x21909
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x21883
1872C
Non-coprime Split
math
,
number theory
1100
x21861
1679A
AvtoBus
brute force
,
greedy
,
math
,
number theory
900
x21765
1720A
Burenka Plays with Fractions
math
,
number theory
900
x21705
1742D
Coprime
brute force
,
greedy
,
number theory
1100
x21504
1712B
Woeful Permutation
constructive algorithms
,
greedy
,
number theory
800
x21218
414B
Mashmokh and ACM
combinatorics
,
dp
,
number theory
1400
x20776
1485A
Add and Divide
brute force
,
greedy
,
math
,
number theory
1000
x20766
1521B
Nastia and a Good Array
constructive algorithms
,
math
,
number theory
1300
x20724
1828B
Permutation Swap
math
,
number theory
900
x20544
1350B
Orac and Models
dp
,
math
,
number theory
1400
x20536
682A
Alyona and Numbers
constructive algorithms
,
math
,
number theory
1100
x20429
1605A
A.M. Deviation
math
,
number theory
800
x20317
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20268
1454D
Number into Sequence
constructive algorithms
,
math
,
number theory
1300
x19701
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19656
1487B
Cat Cycle
math
,
number theory
1200
x19598
1740A
Factorise N+M
constructive algorithms
,
number theory
800
x19578
1593D1
All are Same
math
,
number theory
1100
x19547
519C
A and B and Team Training
greedy
,
implementation
,
math
,
number theory
1300
x19319
776B
Sherlock and his girlfriend
constructive algorithms
,
number theory
1200
x19248
1945B
Fireworks
math
,
number theory
900
x19228
1562B
Scenes From a Memory
brute force
,
constructive algorithms
,
implementation
,
math
,
number theory
1000
x19156
1717A
Madoka and Strange Thoughts
math
,
number theory
800
x19114
1762A
Divide and Conquer
greedy
,
math
,
number theory
800
x18519
1656C
Make Equal With Mod
constructive algorithms
,
math
,
number theory
,
sortings
1200
x18455
1658B
Marin and Anti-coprime Permutation
combinatorics
,
math
,
number theory
800
x18349
1538F
Interesting Function
binary search
,
dp
,
math
,
number theory
1500
x18300
1932B
Chaya Calendar
number theory
1100
x18198
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18109
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x17966
762A
k-th divisor
math
,
number theory
1400
x17901
1411B
Fair Numbers
brute force
,
number theory
1000
x17736
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17555
755A
PolandBall and Hypothesis
brute force
,
graphs
,
math
,
number theory
800
x17503
664A
Complicated GCD
math
,
number theory
800
x17378
1736B
Playing with GCD
math
,
number theory
1200
x17224
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17122
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x17030
1332B
Composite Coloring
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1400
x17017
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