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Codeforces Round 940 (Div. 2) and CodeCraft-23
40:49:38
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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
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x2410
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x835
1952I
Dark Matter
bitmasks
,
geometry
x301
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x3106
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x6913
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x558
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x3791
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x13731
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x395
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x6391
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1123
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1149
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x2981
1933G
Turtle Magic: Royal Turtle Shell Pattern
bitmasks
,
brute force
,
combinatorics
,
constructive algorithms
,
dfs and similar
,
math
2300
x838
1930F
Maximize the Difference
bitmasks
,
brute force
,
dfs and similar
2700
x589
1930D2
Sum over all Substrings (Hard Version)
bitmasks
,
divide and conquer
,
dp
,
dsu
,
greedy
,
implementation
,
strings
2100
x2321
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1466
1926F
Vlad and Avoiding X
bitmasks
,
brute force
,
dfs and similar
,
dp
,
implementation
2200
x1427
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x9682
1926D
Vlad and Division
bitmasks
,
greedy
1300
x13207
1922E
Increasing Subsequences
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
math
1800
x6931
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x12320
1917F
Construct Tree
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x881
1915B
Not Quite Latin Square
bitmasks
,
brute force
,
implementation
800
x37960
1915A
Odd One Out
bitmasks
,
implementation
800
x48751
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x13443
1912K
Kim's Quest
bitmasks
,
combinatorics
,
dp
1800
x1936
1909E
Multiple Lamps
bitmasks
,
brute force
,
constructive algorithms
,
math
,
number theory
2400
x1226
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x13589
1906B
Button Pressing
bitmasks
,
constructive algorithms
,
hashing
2600
x450
1903D2
Maximum And Queries (hard version)
bitmasks
,
divide and conquer
,
dp
,
greedy
2500
x696
1903D1
Maximum And Queries (easy version)
binary search
,
bitmasks
,
brute force
,
greedy
1700
x4988
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x11176
1900D
Small GCD
bitmasks
,
brute force
,
dp
,
math
,
number theory
2000
x3639
1895D
XOR Construction
bitmasks
,
constructive algorithms
,
data structures
,
math
,
string suffix structures
,
trees
1900
x5504
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1310
1883E
Look Back
bitmasks
,
greedy
1700
x6842
1882D
Tree XOR
bitmasks
,
dfs and similar
,
dp
,
greedy
,
trees
1900
x4907
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x14151
1879D
Sum of XOR Functions
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
1700
x6476
1878G
wxhtzdy ORO Tree
binary search
,
bitmasks
,
brute force
,
data structures
,
dfs and similar
,
implementation
,
trees
2300
x1081
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x10857
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x10682
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1047
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x11734
1870E
Another MEX Problem
bitmasks
,
brute force
,
dp
,
shortest paths
2300
x2187
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x13256
1868B2
Candy Party (Hard Version)
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
implementation
,
math
2100
x2254
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6379
1867B
XOR Palindromes
bitmasks
,
constructive algorithms
,
strings
1100
x15674
1864E
Guess Game
bitmasks
,
data structures
,
games
,
math
,
probabilities
,
sortings
,
strings
,
trees
2100
x2457
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x12509
1863F
Divide, XOR, and Conquer
bitmasks
,
dp
,
math
2600
x989
1862F
Magic Will Save the World
binary search
,
bitmasks
,
brute force
,
dp
1800
x5585
1861F
Four Suits
binary search
,
bitmasks
,
flows
,
greedy
3200
x144
1856E2
PermuTree (hard version)
bitmasks
,
dfs and similar
,
dp
,
fft
,
greedy
,
implementation
,
math
,
trees
2700
x1298
1854B
Earn or Unlock
bitmasks
,
brute force
,
dp
2200
x3296
1851F
Lisa and the Martians
bitmasks
,
greedy
,
math
,
strings
,
trees
1800
x5237
1849F
XOR Partition
binary search
,
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
trees
2700
x620
1848F
Vika and Wiki
binary search
,
bitmasks
,
combinatorics
,
divide and conquer
,
dp
,
math
2400
x1433
1847F
The Boss's Identity
binary search
,
bitmasks
,
data structures
,
dfs and similar
,
greedy
,
math
,
sortings
2500
x845
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12138
1847B
Hamon Odyssey
bitmasks
,
greedy
,
two pointers
1000
x18973
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x3998
1844G
Tree Weights
bitmasks
,
constructive algorithms
,
data structures
,
dfs and similar
,
implementation
,
math
,
matrices
,
number theory
,
trees
3000
x632
1843C
Sum in Binary Tree
bitmasks
,
combinatorics
,
math
,
trees
800
x30881
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x554
1842B
Tenzing and Books
bitmasks
,
greedy
,
math
1100
x15487
1840B
Binary Cafe
bitmasks
,
combinatorics
,
math
1100
x21380
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x134
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x924
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x6959
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x26916
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1488
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1022
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x17528
1805A
We Need the Zero
bitmasks
,
brute force
800
x20766
1804H
Code Lock
bitmasks
,
dp
3300
x168
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1352
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8056
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3660
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x269
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x641
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5848
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14089
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x509
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1557
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x776
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2164
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1360
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4626
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1213
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x809
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x7607
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x806
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3188
1775C
Interesting Sequence
bitmasks
,
math
1600
x9549
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x12297
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x318
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x946
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