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Codeforces Round 950 (Div. 3)
36:27:36
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Difficulty:
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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
1981C
Turtle and an Incomplete Sequence
bitmasks
,
constructive algorithms
,
greedy
,
implementation
,
math
,
shortest paths
x2604
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
x8123
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1125
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x13705
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x517
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x136
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x11360
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x207
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1394
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5466
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3837
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15806
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3380
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1073
1952I
Dark Matter
bitmasks
,
geometry
x380
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3650
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7891
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x629
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4169
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x14659
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x428
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6690
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1195
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1220
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3139
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x894
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x621
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2401
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1541
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1529
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10376
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13935
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7160
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12777
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x908
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x39088
1915A
Odd One Out
bitmasks
,
implementation
800
x50808
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13912
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2100
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1266
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x14357
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x460
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x716
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5184
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11582
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3769
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5635
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1348
1883E
Look Back
bitmasks
,
greedy
1700
x7198
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5042
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14466
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6702
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1105
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11347
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10926
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1075
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12244
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2226
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13510
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2293
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6541
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15996
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2481
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12746
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1044
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5766
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x149
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1321
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3374
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5385
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x666
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1466
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x861
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12311
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19233
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4104
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x654
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31377
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x568
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15897
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21642
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x152
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x946
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7168
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27336
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1517
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1060
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17902
1805A
We Need the Zero
bitmasks
,
brute force
800
x21409
1804H
Code Lock
bitmasks
,
dp
3300
x170
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1375
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8188
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3725
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x273
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x658
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5948
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14322
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x523
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1590
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x801
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