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Before contest
Codeforces Round 971 (Div. 4)
18:48:36
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Difficulty:
—
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
1988C
Increasing Sequence with Fixed OR
bitmasks
,
constructive algorithms
,
greedy
1300
x15403
1981B
Turtle and an Infinite Sequence
bitmasks
,
math
1300
x13053
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x13429
1926E
Vlad and an Odd Ordering
binary search
,
bitmasks
,
data structures
,
dp
,
implementation
,
math
,
number theory
1500
x11508
1926D
Vlad and Division
bitmasks
,
greedy
1300
x15119
1918C
XOR-distance
bitmasks
,
greedy
,
implementation
,
math
1400
x13644
1913C
Game with Multiset
binary search
,
bitmasks
,
brute force
,
greedy
1300
x14683
1909B
Make Almost Equal With Mod
bitmasks
,
constructive algorithms
,
math
,
number theory
1200
x16359
1903B
StORage room
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1200
x12514
1882B
Sets and Union
bitmasks
,
brute force
,
constructive algorithms
,
greedy
1300
x15222
1878E
Iva & Pav
binary search
,
bitmasks
,
data structures
,
greedy
1400
x12443
1875C
Jellyfish and Green Apple
bitmasks
,
greedy
,
math
,
number theory
1400
x11563
1872E
Data Structures Fan
binary search
,
bitmasks
,
data structures
,
dp
1500
x13279
1870B
Friendly Arrays
bitmasks
,
greedy
,
math
1200
x14031
1864C
Divisor Chain
bitmasks
,
constructive algorithms
,
math
,
number theory
1300
x13302
1847C
Vampiric Powers, anyone?
bitmasks
,
brute force
,
dp
,
greedy
1400
x12751
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x14954
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x13639
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x10556
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x11123
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x18160
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17586
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10874
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x13943
1634B
Fortune Telling
bitmasks
,
math
1400
x16417
1630A
And Matching
bitmasks
,
constructive algorithms
1500
x14458
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15753
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10172
1601A
Array Elimination
bitmasks
,
greedy
,
math
,
number theory
1300
x14353
1600J
Robot Factory
bitmasks
,
dfs and similar
1400
x3874
1553C
Penalty
bitmasks
,
brute force
,
dp
,
greedy
1200
x17748
1547D
Co-growing Sequence
bitmasks
,
constructive algorithms
,
greedy
1300
x16553
1516B
AGAGA XOOORRR
bitmasks
,
brute force
,
dp
,
greedy
1500
x19133
1514B
AND 0, Sum Big
bitmasks
,
combinatorics
,
math
1200
x24552
1513B
AND Sequences
bitmasks
,
combinatorics
,
constructive algorithms
,
math
1400
x14527
1498B
Box Fitting
binary search
,
bitmasks
,
data structures
,
greedy
1300
x16922
1494B
Berland Crossword
bitmasks
,
brute force
,
greedy
,
implementation
1400
x14265
1463B
Find The Array
bitmasks
,
constructive algorithms
,
greedy
1400
x19246
1420B
Rock and Lever
bitmasks
,
math
1200
x25348
1385D
a-Good String
bitmasks
,
brute force
,
divide and conquer
,
dp
,
implementation
1500
x19182
1362C
Johnny and Another Rating Drop
bitmasks
,
greedy
,
math
1400
x18122
1362B
Johnny and His Hobbies
bitmasks
,
brute force
1200
x18990
1312C
Adding Powers
bitmasks
,
greedy
,
implementation
,
math
,
number theory
,
ternary search
1400
x16425
1270C
Make Good
bitmasks
,
constructive algorithms
,
math
1400
x14039
1152B
Neko Performs Cat Furrier Transform
bitmasks
,
constructive algorithms
,
dfs and similar
,
math
1300
x8882
1097B
Petr and a Combination Lock
bitmasks
,
brute force
,
dp
1200
x28252
1095C
Powers Of Two
bitmasks
,
greedy
1400
x16653
1042B
Vitamins
bitmasks
,
brute force
,
dp
,
implementation
1200
x15858
961C
Chessboard
bitmasks
,
brute force
,
implementation
1400
x5280
912B
New Year's Eve
bitmasks
,
constructive algorithms
,
number theory
1300
x11934
868C
Qualification Rounds
bitmasks
,
brute force
,
constructive algorithms
,
dp
1500
x4594
743B
Chloe and the sequence
binary search
,
bitmasks
,
constructive algorithms
,
implementation
1200
x14631
677C
Vanya and Label
bitmasks
,
combinatorics
,
implementation
,
strings
1500
x6368
611B
New Year and Old Property
bitmasks
,
brute force
,
implementation
1300
x10020
550B
Preparing Olympiad
bitmasks
,
brute force
1400
x20687
476B
Dreamoon and WiFi
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
probabilities
1300
x30254
437B
The Child and Set
bitmasks
,
greedy
,
implementation
,
sortings
1500
x9420
224B
Array
bitmasks
,
implementation
,
two pointers
1500
x7290
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3615
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x15171
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5317
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