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Before contest
Codeforces Round 941 (Div. 1)
27:21:19
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Before contest
Codeforces Round 941 (Div. 2)
27:21:19
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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
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strings
ternary search
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Problems
#
Name
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
x2988
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
x13315
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2833
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x912
1952I
Dark Matter
bitmasks
,
geometry
x319
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3255
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x7141
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x578
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3877
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x13908
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x403
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6456
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1143
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1161
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3010
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x849
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x599
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2339
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1473
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1445
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9792
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13306
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6964
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12403
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x885
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x38125
1915A
Odd One Out
bitmasks
,
implementation
800
x49037
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13520
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x1978
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1234
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13677
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x453
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x702
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x5017
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11238
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3664
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5528
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1320
1883E
Look Back
bitmasks
,
greedy
1700
x6965
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4935
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14194
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6517
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1084
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x10918
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10725
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1055
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x11797
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2191
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13279
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2262
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6405
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15737
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2459
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12538
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x1025
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5611
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x146
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1301
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3313
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5265
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x637
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1442
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x849
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12172
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x19019
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x4021
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x637
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30949
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x555
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15551
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21408
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x137
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x933
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x6999
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x26967
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1493
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1028
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17593
1805A
We Need the Zero
bitmasks
,
brute force
800
x20869
1804H
Code Lock
bitmasks
,
dp
3300
x168
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1354
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8080
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3670
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x270
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x644
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5858
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14119
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x511
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1563
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x783
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2169
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1367
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4628
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1214
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x813
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7625
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x813
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3199
1775C
Interesting Sequence
bitmasks
,
math
1600
x9588
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12455
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