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Before contest
Codeforces Round 973 (Div. 2)
13:22:43
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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
1835C
Twin Clusters
bitmasks
,
brute force
,
constructive algorithms
,
math
,
probabilities
2600
x984
1829H
Don't Blame Me
bitmasks
,
combinatorics
,
dp
,
math
1700
x7683
1829C
Mr. Perfectly Fine
bitmasks
,
greedy
,
implementation
800
x28414
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1591
1815D
XOR Counting
bitmasks
,
combinatorics
,
dp
,
math
2600
x1126
1807G2
Subsequence Addition (Hard Version)
bitmasks
,
dp
,
greedy
,
implementation
,
sortings
1100
x19191
1805A
We Need the Zero
bitmasks
,
brute force
800
x23236
1804H
Code Lock
bitmasks
,
dp
3300
x185
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1440
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8526
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3873
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x279
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x681
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6232
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x15050
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x713
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1664
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x833
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2329
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1465
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4907
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1256
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x870
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x8168
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x931
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3456
1775C
Interesting Sequence
bitmasks
,
math
1600
x10383
1775B
Gardener and the Array
bitmasks
,
constructive algorithms
1300
x13776
1773G
Game of Questions
bitmasks
,
combinatorics
,
dp
,
fft
,
math
,
probabilities
2800
x359
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x1113
1770F
Koxia and Sequence
bitmasks
,
combinatorics
,
dp
,
math
,
number theory
3100
x662
1767E
Algebra Flash
bitmasks
,
brute force
,
dp
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x913
1765A
Access Levels
bitmasks
,
dsu
,
flows
,
graph matchings
2400
x695
1763A
Absolute Maximization
bitmasks
,
constructive algorithms
,
greedy
,
math
800
x15650
1760G
SlavicG's Favorite Problem
bitmasks
,
dfs and similar
,
graphs
1700
x7313
1748F
Circular Xor Reversal
bitmasks
,
constructive algorithms
3000
x334
1748D
ConstructOR
bitmasks
,
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
math
,
number theory
2100
x2790
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4629
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x255
1742G
Orray
bitmasks
,
brute force
,
greedy
,
math
,
sortings
1500
x10666
1741G
Kirill and Company
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
,
graphs
,
shortest paths
2200
x1489
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x528
1739E
Cleaning Robot
bitmasks
,
dp
2400
x1215
1734F
Zeros and Ones
bitmasks
,
divide and conquer
,
dp
,
math
2500
x795
1732C2
Sheikh (Hard Version)
binary search
,
bitmasks
,
brute force
,
greedy
,
implementation
,
two pointers
2100
x2559
1732C1
Sheikh (Easy version)
binary search
,
bitmasks
,
greedy
,
two pointers
1800
x5870
1731C
Even Subarrays
bitmasks
,
brute force
,
hashing
,
math
,
number theory
1700
x9460
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x546
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x462
1726B
Mainak and Interesting Sequence
bitmasks
,
constructive algorithms
,
math
1100
x15133
1725F
Field Photography
bitmasks
,
data structures
,
sortings
2100
x985
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x121
1722G
Even-Odd XOR
bitmasks
,
constructive algorithms
,
greedy
1500
x11228
1721D
Maximum AND
bitmasks
,
dfs and similar
,
divide and conquer
,
greedy
,
sortings
1800
x6587
1720D2
Xor-Subsequence (hard version)
bitmasks
,
data structures
,
dp
,
strings
,
trees
2400
x1830
1720D1
Xor-Subsequence (easy version)
bitmasks
,
brute force
,
dp
,
strings
,
trees
,
two pointers
1800
x5952
1716E
Swap and Maximum Block
bitmasks
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
2500
x1086
1715D
2+ doors
2-sat
,
bitmasks
,
graphs
,
greedy
1900
x5112
1713F
Lost Array
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
2900
x532
1710C
XOR Triangle
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
greedy
,
math
2500
x1353
1709F
Multiset of Strings
bitmasks
,
brute force
,
dp
,
fft
,
flows
,
graphs
,
math
,
meet-in-the-middle
,
trees
2500
x548
1709E
XOR Tree
bitmasks
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
trees
2400
x2691
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x150
1705F
Mark and the Online Exam
bitmasks
,
constructive algorithms
,
interactive
,
probabilities
2900
x605
1705E
Mark and Professor Koro
binary search
,
bitmasks
,
brute force
,
combinatorics
,
data structures
,
greedy
2300
x2062
1703G
Good Key, Bad Key
bitmasks
,
brute force
,
dp
,
greedy
,
math
1600
x10585
1699B
Almost Ternary Matrix
bitmasks
,
constructive algorithms
,
matrices
900
x19658
1698G
Long Binary String
bitmasks
,
math
,
matrices
,
meet-in-the-middle
,
number theory
2900
x315
1698A
XOR Mixup
bitmasks
,
brute force
800
x28908
1696A
NIT orz!
bitmasks
,
greedy
800
x18718
1689E
ANDfinity
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2500
x1202
1688B
Patchouli's Magical Talisman
bitmasks
,
constructive algorithms
,
greedy
,
sortings
800
x18241
1688A
Cirno's Perfect Bitmasks Classroom
bitmasks
,
brute force
800
x21570
1682B
AND Sorting
bitmasks
,
constructive algorithms
,
sortings
1100
x18441
1680E
Moving Chips
bitmasks
,
dp
,
greedy
2000
x3776
1679F
Formalism for Formalism
bitmasks
,
dp
,
math
2600
x535
1679E
Typical Party in Dorm
bitmasks
,
combinatorics
,
dp
,
strings
2400
x1151
1673F
Anti-Theft Road Planning
bitmasks
,
constructive algorithms
,
divide and conquer
,
greedy
,
interactive
,
math
2400
x814
1673E
Power or XOR?
bitmasks
,
combinatorics
,
math
,
number theory
2500
x702
1670F
Jee, You See?
bitmasks
,
combinatorics
,
dp
2400
x968
1670E
Hemose on the Tree
bitmasks
,
constructive algorithms
,
dfs and similar
,
trees
2200
x1740
1669H
Maximal AND
bitmasks
,
greedy
,
math
1300
x18350
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1514
1665D
GCD Guess
bitmasks
,
chinese remainder theorem
,
constructive algorithms
,
games
,
interactive
,
math
,
number theory
2000
x3902
1661B
Getting Zero
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1300
x17664
1659E
AND-MEX Walk
bitmasks
,
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2200
x1547
1659B
Bit Flipping
bitmasks
,
constructive algorithms
,
greedy
,
strings
1300
x10907
1658D2
388535 (Hard Version)
bitmasks
,
brute force
,
data structures
,
math
2300
x2530
1658D1
388535 (Easy Version)
bitmasks
,
math
1600
x9036
1654F
Minimal String Xoration
bitmasks
,
data structures
,
divide and conquer
,
greedy
,
hashing
,
sortings
,
strings
2800
x1187
1646C
Factorials and Powers of Two
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
math
1500
x14034
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1148
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6234
1635A
Min Or Sum
bitmasks
,
greedy
800
x22839
1634B
Fortune Telling
bitmasks
,
math
1400
x16510
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12690
1632B
Roof Construction
bitmasks
,
constructive algorithms
1000
x22170
1630A
And Matching
bitmasks
,
constructive algorithms
1500
x14495
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x2045
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x17186
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