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Problems
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Name
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
greedy
,
math
,
two pointers
x8547
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x181
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1274
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5132
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3668
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15154
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3252
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1033
1952I
Dark Matter
bitmasks
,
geometry
x355
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3539
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7691
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x616
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4069
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x14372
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x419
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6607
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1175
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1206
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3094
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x873
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x615
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2378
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1518
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1504
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10147
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13700
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7075
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12623
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x901
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38767
1915A
Odd One Out
bitmasks
,
implementation
800
x50112
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13740
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2056
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1254
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x14014
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x456
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x711
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5117
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11450
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3732
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5593
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1337
1883E
Look Back
bitmasks
,
greedy
1700
x7088
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4990
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14327
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6624
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1098
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11165
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10823
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1069
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12087
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2215
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13377
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2279
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6479
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15890
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2469
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12645
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1031
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5712
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x147
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1317
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3354
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5324
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x657
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1452
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x856
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12252
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19129
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4066
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x645
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31176
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x563
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15728
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21546
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x144
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x940
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7117
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27201
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1507
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1047
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17766
1805A
We Need the Zero
bitmasks
,
brute force
800
x21179
1804H
Code Lock
bitmasks
,
dp
3300
x169
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1364
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8138
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3704
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x271
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x653
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5908
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14220
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x521
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1579
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x796
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2185
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1380
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4657
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1222
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x823
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7694
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data structures
dfs and similar
divide and conquer
dp
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geometry
graph matchings
graphs
greedy
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