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Codeforces Round (Div. 2)
5 days
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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
1982E
Number of k-good subarrays
bitmasks
,
brute force
,
combinatorics
,
divide and conquer
,
dp
,
math
,
meet-in-the-middle
2300
x1061
1981C
Turtle and an Incomplete Sequence
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
,
math
1800
x4214
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x11593
1980G
Yasya and the Mysterious Tree
bitmasks
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
strings
,
trees
2300
x934
1979D
Fixing a Binary String
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
hashing
,
strings
1800
x5437
1979B
XOR Sequences
bitmasks
,
greedy
1000
x19908
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1519
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x15797
1975F
Set
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
divide and conquer
,
dp
,
math
2600
x669
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
3100
x175
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x12407
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x254
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1469
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5835
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4028
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x16525
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3518
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1123
1952I
Dark Matter
bitmasks
,
geometry
x404
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3863
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x8279
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x655
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4292
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x15173
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x449
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6884
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1227
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1255
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3222
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x911
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x655
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2458
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1566
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1572
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x10853
1926D
Vlad and Division
bitmasks
,
greedy
1300
x14422
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x7283
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x13112
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x919
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x39910
1915A
Odd One Out
bitmasks
,
implementation
800
x52280
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x14197
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x2169
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1289
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x15041
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x467
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x730
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5303
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11906
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3880
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5724
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1372
1883E
Look Back
bitmasks
,
greedy
1700
x7448
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x5134
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14823
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6933
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1129
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x11750
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11169
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1097
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x12598
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2259
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13727
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2322
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6671
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x16274
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2504
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12973
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1055
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5876
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x188
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1335
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3410
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5508
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x680
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1486
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x865
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12461
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19470
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4185
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x673
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x31849
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x581
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x16244
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21915
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x157
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x950
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7334
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x27695
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1531
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1076
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x18242
1805A
We Need the Zero
bitmasks
,
brute force
800
x21909
1804H
Code Lock
bitmasks
,
dp
3300
x171
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1381
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8290
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3769
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x275
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x660
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6014
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