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Codeforces Round 974 (Div. 3)
00:37:46
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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
1627A
Not Shading
constructive algorithms
,
implementation
800
x23992
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x728
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1565
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3911
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10889
1626B
Minor Reduction
greedy
,
strings
1100
x22777
1626A
Equidistant Letters
constructive algorithms
,
sortings
800
x28722
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x594
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x1038
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x2045
1625C
Road Optimization
dp
1700
x10584
1625B
Elementary Particles
brute force
,
greedy
,
sortings
1100
x16066
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x17188
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5900
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3291
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x4080
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x16933
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x24788
1624B
Make AP
implementation
,
math
900
x36515
1624A
Plus One on the Subset
math
800
x51655
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1096
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1367
1623C
Balanced Stone Heaps
binary search
,
greedy
1600
x12079
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x14071
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x20020
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x650
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1893
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x4031
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x13027
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20892
1622A
Construct a Rectangle
geometry
,
math
800
x29981
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x116
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x178
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x648
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x552
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1757
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x4056
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6879
1621B
Integers Shop
data structures
,
greedy
,
implementation
1500
x13382
1621A
Stable Arrangement of Rooks
constructive algorithms
800
x23756
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x891
1620F
Bipartite Array
dp
,
greedy
2800
x604
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x8214
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4173
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x6549
1620B
Triangles on a Rectangle
geometry
,
greedy
,
math
1000
x21020
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21551
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1135
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2393
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x2090
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x9141
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x7525
1619C
Wrong Addition
implementation
1200
x20890
1619B
Squares and Cubes
implementation
,
math
800
x30697
1619A
Square String?
implementation
,
strings
800
x51215
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1559
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4186
1618E
Singers' Tour
constructive algorithms
,
math
1700
x7150
1618D
Array and Operations
dp
,
greedy
,
math
1300
x18869
1618C
Paint the Array
math
1100
x22890
1618B
Missing Bigram
implementation
800
x22590
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x32222
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x865
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1780
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4671
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14953
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x23273
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16262
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x913
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x280
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x592
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2481
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4881
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x12201
1616B
Mirror in the String
greedy
,
strings
1100
x19634
1616A
Integer Diversity
implementation
800
x22677
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x326
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x150
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x870
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1469
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1884
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8353
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15872
1615A
Closing The Gap
greedy
,
math
800
x20727
1614E
Divan and a Cottage
binary search
,
data structures
2600
x826
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2320
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3870
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10219
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x19151
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x23235
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x684
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5158
1613D
MEX Sequences
dp
,
math
1900
x4590
1613C
Poisoned Dagger
binary search
1200
x24294
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21585
1613A
Long Comparison
implementation
,
math
900
x24441
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x837
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x604
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2491
1612D
X-Magic Pair
math
,
number theory
1600
x9119
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