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Before contest
Codeforces Round 941 (Div. 1)
34:57:53
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Before contest
Codeforces Round 941 (Div. 2)
34:57:53
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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
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strings
ternary search
trees
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Problems
#
Name
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
x757
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3035
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1548
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x14325
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x11269
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x19387
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2010
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x460
1945B
Fireworks
math
,
number theory
900
x19067
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x169
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17469
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20192
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x29542
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x859
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6598
1932B
Chaya Calendar
number theory
1100
x18116
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2404
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15607
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1509
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7359
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9787
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18063
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11691
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1642
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x132
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23457
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24431
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1234
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3939
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13673
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x8685
1906G
Grid Game 2
games
,
number theory
2900
x144
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x12123
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3662
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12092
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x17916
1899A
Game with Integers
games
,
math
,
number theory
800
x37230
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x84
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2779
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x949
1881D
Divide and Equalize
math
,
number theory
1300
x14213
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x469
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3684
1877C
Joyboard
math
,
number theory
1200
x9990
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7441
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10722
1872C
Non-coprime Split
math
,
number theory
1100
x21838
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7163
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12534
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x29058
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x21851
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10568
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23566
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7527
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x16973
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x737
1848C
Vika and Price Tags
math
,
number theory
1800
x5917
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x349
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24401
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11576
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13364
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x442
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2041
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1512
1828B
Permutation Swap
math
,
number theory
900
x20498
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12737
1826B
Lunatic Never Content
math
,
number theory
1100
x15626
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11627
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2287
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6444
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16909
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x323
1812F
Factorization
*special problem
,
number theory
x949
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4329
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11493
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17114
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x328
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11462
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x544
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x467
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7748
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1179
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x167
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3333
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1300
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x755
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x16845
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x12652
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2015
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5218
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x665
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1367
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1297
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x16475
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x595
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7666
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5736
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x8957
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