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Before contest
Codeforces Round 973 (Div. 2)
13:50:05
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Difficulty:
—
bitmasks
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
2009F
Firefly's Queries
bitmasks
,
data structures
,
flows
,
math
1700
x5366
2002G
Lattice Optimizing
bitmasks
,
brute force
,
hashing
,
meet-in-the-middle
3400
x196
1995D
Cases
bitmasks
,
brute force
,
dp
,
strings
2300
x2192
1994G
Minecraft
bitmasks
,
brute force
,
dp
,
graphs
,
math
2600
x1154
1994E
Wooden Game
bitmasks
,
greedy
,
math
,
trees
2000
x4199
1994B
Fun Game
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15867
1993E
Xor-Grid Problem
bitmasks
,
constructive algorithms
,
dp
,
implementation
2700
x468
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
1991B
AND Reconstruction
bitmasks
,
constructive algorithms
,
greedy
1100
x15646
1990D
Grid Puzzle
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
1800
x5907
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x15720
1983G
Your Loss
bitmasks
,
brute force
,
dp
,
trees
3000
x203
1983F
array-value
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
2500
x1105
1982E
Number of k-good subarrays
bitmasks
,
brute force
,
combinatorics
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
2300
x1499
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x5090
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x13246
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x1182
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x6360
1979B
XOR Sequences
bitmasks
,
greedy
1000
x21950
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1758
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x17222
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x784
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x202
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13586
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x316
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1666
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6477
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4354
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x17567
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3795
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1213
1952I
Dark Matter
bitmasks
,
geometry
x531
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4221
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8926
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x675
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4604
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x15934
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x491
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7277
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1333
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1356
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3435
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x958
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x700
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2581
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1655
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1665
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x11648
1926D
Vlad and Division
bitmasks
,
greedy
1300
x15257
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7583
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x13756
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x945
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x41604
1915A
Odd One Out
bitmasks
,
implementation
800
x55946
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x14833
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2383
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1350
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x16617
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x544
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x764
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5626
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x12634
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x4133
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5982
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1430
1883E
Look Back
bitmasks
,
greedy
1700
x8015
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5396
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x15312
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x7289
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1174
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x12615
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11653
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1136
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x13435
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2333
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x14087
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2381
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6915
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16645
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2578
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x13389
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1117
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x6203
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x203
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1372
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3501
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5789
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x713
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1532
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x888
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12813
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19911
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4362
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x716
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x32867
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x651
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x16962
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x22364
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x164
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