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Codeforces Round 973 (Div. 2)
13:26:21
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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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Custom test
Problems
#
Name
2008H
Sakurako's Test
binary search
,
brute force
,
greedy
,
math
,
number theory
2100
x2362
2008G
Sakurako's Task
binary search
,
greedy
,
math
,
number theory
1800
x4226
2008F
Sakurako's Box
combinatorics
,
math
,
number theory
1400
x10940
2007C
Dora and C++
math
,
number theory
1500
x10500
2007A
Dora's Set
greedy
,
math
,
number theory
800
x20654
2006C
Eri and Expanded Sets
data structures
,
divide and conquer
,
math
,
number theory
,
two pointers
2300
x1379
2005D
Alter the GCD
binary search
,
data structures
,
divide and conquer
,
implementation
,
number theory
x553
2004E
Not a Nim Problem
brute force
,
games
,
math
,
number theory
2100
x3694
2002F2
Court Blue (Hard Version)
brute force
,
dp
,
math
,
number theory
2800
x389
2002F1
Court Blue (Easy Version)
brute force
,
dfs and similar
,
dp
,
math
,
number theory
2600
x763
1998B
Minimize Equal Sum Subarrays
constructive algorithms
,
math
,
number theory
1000
x22345
1996D
Fun
binary search
,
brute force
,
combinatorics
,
math
,
number theory
1500
x14834
1995C
Squaring
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
,
number theory
1800
x7876
1994H
Fortnite
combinatorics
,
constructive algorithms
,
games
,
greedy
,
hashing
,
interactive
,
math
,
number theory
,
strings
3500
x490
1994D
Funny Game
constructive algorithms
,
dsu
,
graphs
,
greedy
,
math
,
number theory
,
trees
1900
x5409
1993F2
Dyn-scripted Robot (Hard Version)
chinese remainder theorem
,
math
,
number theory
2800
x359
1993F1
Dyn-scripted Robot (Easy Version)
brute force
,
chinese remainder theorem
,
constructive algorithms
,
math
,
number theory
2400
x913
1992F
Valuable Cards
brute force
,
dp
,
greedy
,
number theory
,
two pointers
1900
x5449
1991H
Prime Split Game
bitmasks
,
dp
,
fft
,
games
,
math
,
number theory
3300
x256
1991D
Prime XOR Coloring
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
math
,
number theory
1900
x6104
1986G2
Permutation Problem (Hard Version)
brute force
,
data structures
,
hashing
,
math
,
number theory
2500
x1010
1986G1
Permutation Problem (Simple Version)
binary search
,
brute force
,
combinatorics
,
data structures
,
math
,
number theory
2200
x1398
1986E
Beautiful Array
greedy
,
math
,
number theory
,
sortings
1700
x8365
1985G
D-Function
combinatorics
,
math
,
number theory
1600
x8902
1985B
Maximum Multiple Sum
brute force
,
math
,
number theory
800
x44210
1982D
Beauty of the mountains
brute force
,
data structures
,
implementation
,
math
,
number theory
1700
x6819
1982B
Collatz Conjecture
brute force
,
implementation
,
math
,
number theory
1200
x16350
1981D
Turtle and Multiplication
constructive algorithms
,
dfs and similar
,
graphs
,
number theory
2400
x1554
1980D
GCD-sequence
greedy
,
implementation
,
math
,
number theory
1400
x13800
1979C
Earning on Bets
binary search
,
combinatorics
,
constructive algorithms
,
number theory
1200
x18163
1978F
Large Graph
data structures
,
dfs and similar
,
dsu
,
graphs
,
number theory
,
two pointers
2400
x1264
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6505
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x202
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x24261
1968A
Maximize?
brute force
,
math
,
number theory
800
x33193
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3833
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x12886
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6477
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1218
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4358
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2169
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x18937
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x14074
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x22783
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2476
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x628
1945B
Fireworks
math
,
number theory
900
x22164
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x220
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x19874
1933C
Turtle Fingers: Count the Values of k
brute force
,
implementation
,
math
,
number theory
1100
x22329
1933B
Turtle Math: Fast Three Task
implementation
,
math
,
number theory
800
x32435
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x1045
1932E
Final Countdown
implementation
,
math
,
number theory
1600
x7968
1932B
Chaya Calendar
number theory
1100
x20437
1931G
One-Dimensional Puzzle
combinatorics
,
math
,
number theory
2000
x2755
1931D
Divisible Pairs
combinatorics
,
math
,
number theory
1300
x18396
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1680
1928C
Physical Education Lesson
brute force
,
math
,
number theory
1600
x8372
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x11648
1925B
A Balanced Problemset?
brute force
,
greedy
,
math
,
number theory
1200
x19744
1920C
Partitioning the Array
brute force
,
math
,
number theory
1600
x13285
1917D
Yet Another Inversions Problem
combinatorics
,
data structures
,
dp
,
implementation
,
math
,
number theory
2300
x1766
1916G
Optimizations From Chelsu
divide and conquer
,
dp
,
number theory
,
trees
3500
x147
1916B
Two Divisors
constructive algorithms
,
math
,
number theory
1000
x25464
1916A
2023
constructive algorithms
,
implementation
,
math
,
number theory
800
x25595
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1350
1909D
Split Plus K
greedy
,
math
,
number theory
1900
x4347
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x16617
1907E
Good Triples
brute force
,
combinatorics
,
number theory
1600
x10053
1906G
Grid Game 2
games
,
number theory
2900
x189
1902C
Insert and Equalize
brute force
,
constructive algorithms
,
greedy
,
math
,
number theory
1300
x13591
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x4133
1899D
Yarik and Musical Notes
hashing
,
math
,
number theory
1300
x13408
1899B
250 Thousand Tons of TNT
brute force
,
implementation
,
number theory
1100
x20399
1899A
Game with Integers
games
,
math
,
number theory
800
x45061
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x101
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x87
1884D
Counting Rhyme
dp
,
math
,
number theory
2100
x3163
1882E1
Two Permutations (Easy Version)
brute force
,
constructive algorithms
,
greedy
,
number theory
2400
x1005
1881D
Divide and Equalize
math
,
number theory
1300
x16884
1879F
Last Man Standing
brute force
,
data structures
,
number theory
2800
x508
1878F
Vasilije Loves Number Theory
brute force
,
math
,
number theory
1900
x4074
1877C
Joyboard
math
,
number theory
1200
x10849
1876B
Effects of Anti Pimples
combinatorics
,
number theory
,
sortings
1500
x8196
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11653
1872C
Non-coprime Split
math
,
number theory
1100
x23264
1866B
Battling with Numbers
combinatorics
,
math
,
number theory
1400
x7664
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x13389
1859A
United We Stand
constructive algorithms
,
math
,
number theory
800
x32168
1858C
Yet Another Permutation Problem
constructive algorithms
,
greedy
,
math
,
number theory
1000
x22963
1858B
The Walkway
brute force
,
dp
,
greedy
,
math
,
number theory
1500
x11248
1855B
Longest Divisors Interval
brute force
,
combinatorics
,
greedy
,
math
,
number theory
900
x26391
1852A
Ntarsis' Set
binary search
,
math
,
number theory
1800
x7998
1850F
We Were Both Children
brute force
,
implementation
,
math
,
number theory
1300
x18940
1848E
Vika and Stone Skipping
brute force
,
implementation
,
math
,
number theory
2600
x782
1848C
Vika and Price Tags
math
,
number theory
1800
x6262
1845F
Swimmers in the Pool
dp
,
fft
,
math
,
number theory
2800
x370
1845A
Forbidden Integer
constructive algorithms
,
implementation
,
math
,
number theory
800
x27115
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x716
1844D
Row Major
constructive algorithms
,
greedy
,
math
,
number theory
,
strings
1400
x12240
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