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Before contest
Codeforces Round 953 (Div. 2)
03:36:19
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combine-tags-by-or
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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
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10685
1626B
Minor Reduction
greedy
,
strings
1100
x22448
1626A
Equidistant Letters
constructive algorithms
,
sortings
800
x28440
1625E2
Cats on the Upgrade (hard version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
trees
2800
x583
1625E1
Cats on the Upgrade (easy version)
brute force
,
data structures
,
dfs and similar
,
divide and conquer
,
dp
,
graphs
,
trees
2500
x982
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x1983
1625C
Road Optimization
dp
1700
x10211
1625B
Elementary Particles
brute force
,
greedy
,
sortings
1100
x15924
1625A
Ancient Civilization
bitmasks
,
greedy
,
math
800
x17025
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5663
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3209
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x3987
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x16456
1624C
Division by Two and Permutation
constructive algorithms
,
flows
,
graph matchings
,
greedy
,
math
1100
x24225
1624B
Make AP
implementation
,
math
900
x34882
1624A
Plus One on the Subset
math
800
x50315
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1080
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1356
1623C
Balanced Stone Heaps
binary search
,
greedy
1600
x11483
1623B
Game on Ranges
brute force
,
dfs and similar
,
implementation
,
sortings
1100
x13948
1623A
Robot Cleaner
brute force
,
implementation
,
math
800
x19931
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x604
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1854
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x3905
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x12539
1622B
Berland Music
data structures
,
greedy
,
math
,
sortings
1000
x20643
1622A
Construct a Rectangle
geometry
,
math
800
x29611
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x111
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x163
1621G
Weighted Increasing Subsequences
data structures
,
dp
,
math
3200
x627
1621F
Strange Instructions
data structures
,
greedy
,
implementation
2700
x540
1621E
New School
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
sortings
2300
x1735
1621D
The Winter Hike
constructive algorithms
,
greedy
,
math
2100
x3988
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6771
1621B
Integers Shop
data structures
,
greedy
,
implementation
1500
x13190
1621A
Stable Arrangement of Rooks
constructive algorithms
800
x23624
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x866
1620F
Bipartite Array
dp
,
greedy
2800
x591
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x7897
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4078
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x6408
1620B
Triangles on a Rectangle
geometry
,
greedy
,
math
1000
x19958
1620A
Equal or Not Equal
constructive algorithms
,
dsu
,
implementation
800
x21322
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1085
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2327
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x2049
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x8770
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x7339
1619C
Wrong Addition
implementation
1200
x20451
1619B
Squares and Cubes
implementation
,
math
800
x30261
1619A
Square String?
implementation
,
strings
800
x49180
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1496
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4077
1618E
Singers' Tour
constructive algorithms
,
math
1700
x7004
1618D
Array and Operations
dp
,
greedy
,
math
1300
x18460
1618C
Paint the Array
math
1100
x21872
1618B
Missing Bigram
implementation
800
x22388
1618A
Polycarp and Sums of Subsequences
math
,
sortings
800
x31781
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x843
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1730
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4573
1617C
Paprika and Permutation
binary search
,
greedy
,
math
,
sortings
1300
x14706
1617B
GCD Problem
brute force
,
constructive algorithms
,
math
,
number theory
900
x22653
1617A
Forbidden Subsequence
constructive algorithms
,
greedy
,
sortings
,
strings
800
x16137
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x805
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x267
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x586
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2402
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4753
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x12044
1616B
Mirror in the String
greedy
,
strings
1100
x19197
1616A
Integer Diversity
implementation
800
x22509
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x311
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x149
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x771
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1411
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1849
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8166
1615B
And It's Non-Zero
bitmasks
,
greedy
,
math
1300
x15380
1615A
Closing The Gap
greedy
,
math
800
x20581
1614E
Divan and a Cottage
binary search
,
data structures
2600
x813
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2207
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3690
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10000
1614B
Divan and a New Project
constructive algorithms
,
sortings
1000
x18196
1614A
Divan and a Store
brute force
,
constructive algorithms
,
greedy
800
x23114
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x670
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5027
1613D
MEX Sequences
dp
,
math
1900
x4474
1613C
Poisoned Dagger
binary search
1200
x22932
1613B
Absent Remainder
greedy
,
implementation
,
sortings
1000
x21291
1613A
Long Comparison
implementation
,
math
900
x24103
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x818
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x577
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2415
1612D
X-Magic Pair
math
,
number theory
1600
x8908
1612C
Chat Ban
binary search
,
math
1300
x16166
1612B
Special Permutation
constructive algorithms
,
greedy
900
x16964
1612A
Distance
brute force
,
constructive algorithms
800
x17540
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x609
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