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Codeforces Round 953 (Div. 2)
41:50:09
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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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Problems
#
Name
1985G
D-Function
combinatorics
,
math
,
number theory
x5330
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
x32643
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1075
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x10861
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x14603
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x5322
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x157
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x21672
1968A
Maximize?
brute force
,
math
,
number theory
800
x29832
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3404
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x11289
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5664
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1077
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3811
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x1926
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x17094
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x12788
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x21264
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2197
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x547
1945B
Fireworks
math
,
number theory
900
x20589
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x192
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x18420
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x21105
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x30636
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x917
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7210
1932B
Chaya Calendar
number theory
1100
x19048
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2526
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x16545
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1590
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x7779
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10625
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x18679
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x12179
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1691
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x140
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x24161
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x24832
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1277
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x4083
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x14671
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x9156
1906G
Grid Game 2
games
,
number theory
2900
x153
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x12639
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3818
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x12542
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x18689
1899A
Game with Integers
games
,
math
,
number theory
800
x39613
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x94
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x83
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x2928
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x970
1881D
Divide and Equalize
math
,
number theory
1300
x15186
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x477
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x3871
1877C
Joyboard
math
,
number theory
1200
x10299
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x7695
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11024
1872C
Non-coprime Split
math
,
number theory
1100
x22400
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7327
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12860
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x30058
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22235
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x10812
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x24496
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7692
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x17692
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x752
1848C
Vika and Price Tags
math
,
number theory
1800
x6057
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x356
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x25173
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x661
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x11781
1838C
No Prime Differences
constructive algorithms
,
math
,
number theory
1400
x13683
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x456
1834E
MEX of LCM
binary search
,
data structures
,
implementation
,
math
,
number theory
2300
x2094
1830C
Hyperregular Bracket Strings
combinatorics
,
greedy
,
hashing
,
math
,
number theory
,
sortings
2400
x1559
1828B
Permutation Swap
math
,
number theory
900
x21218
1826C
Dreaming of Freedom
greedy
,
math
,
number theory
1300
x12962
1826B
Lunatic Never Content
math
,
number theory
1100
x16198
1823C
Strongly Composite
greedy
,
math
,
number theory
1300
x11814
1822G2
Magic Triples (Hard Version)
brute force
,
data structures
,
math
,
number theory
2200
x2340
1822G1
Magic Triples (Easy Version)
brute force
,
data structures
,
math
,
number theory
1700
x6631
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x17012
1815E
Bosco and Particle
dp
,
math
,
number theory
,
strings
3100
x330
1812F
Factorization
*special problem
,
number theory
x966
1812D
Trivial Conjecture
*special problem
,
constructive algorithms
,
math
,
number theory
x4350
1811E
Living Sequence
binary search
,
dp
,
math
,
number theory
1500
x11738
1810B
Candies
constructive algorithms
,
math
,
number theory
800
x17235
1806F1
GCD Master (easy version)
greedy
,
math
,
number theory
,
sortings
2900
x339
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x11657
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x550
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x473
1798C
Candy Store
greedy
,
math
,
number theory
1700
x7891
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1206
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x170
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3406
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1324
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x776
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