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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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
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probabilities
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shortest paths
sortings
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strings
ternary search
trees
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Problems
#
Name
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x2769
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1354
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x13243
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x10932
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x18951
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x1954
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x449
1945B
Fireworks
math
,
number theory
900
x18747
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x163
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x17354
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x20059
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x29386
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x850
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x6523
1932B
Chaya Calendar
number theory
1100
x18005
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2388
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x15473
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1493
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7283
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9666
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x17990
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x11610
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1634
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x131
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x23353
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24371
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1224
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x3919
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13580
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x8627
1906G
Grid Game 2
games
,
number theory
2900
x142
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x12069
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3638
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12039
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x17825
1899A
Game with Integers
games
,
math
,
number theory
800
x36968
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x83
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x76
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2764
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x943
1881D
Divide and Equalize
math
,
number theory
1300
x14144
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x465
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3670
1877C
Joyboard
math
,
number theory
1200
x9953
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7391
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10680
1872C
Non-coprime Split
math
,
number theory
1100
x21787
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7144
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12508
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x28934
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x21805
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10530
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x23458
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7493
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x16927
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x735
1848C
Vika and Price Tags
math
,
number theory
1800
x5900
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x347
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x24300
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x632
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11558
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13337
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x436
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2025
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1499
1828B
Permutation Swap
math
,
number theory
900
x20393
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12701
1826B
Lunatic Never Content
math
,
number theory
1100
x15577
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11604
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2270
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6415
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16886
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x321
1812F
Factorization
*special problem
,
number theory
x949
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4325
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11464
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17097
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x325
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11437
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x542
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x463
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7729
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1174
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x165
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3323
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1295
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x754
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x16768
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x12641
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2008
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5210
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x662
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1360
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1293
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x16427
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x594
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x7648
1775D
Friendly Spiders
dfs and similar
,
graphs
,
math
,
number theory
,
shortest paths
1800
x5722
1771C
Hossam and Trainees
greedy
,
math
,
number theory
1600
x8925
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x594
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