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Codeforces Round 976 (Div. 2) and Divide By Zero 9.0
02:15:25
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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
1635D
Infinite Set
bitmasks
,
dp
,
math
,
matrices
,
number theory
,
strings
1800
x6249
1634F
Fibonacci Additions
brute force
,
data structures
,
hashing
,
implementation
,
math
2700
x1597
1634E
Fair Share
constructive algorithms
,
data structures
,
dfs and similar
,
graph matchings
,
graphs
2400
x1695
1634D
Finding Zero
constructive algorithms
,
interactive
,
math
2000
x4363
1634B
Fortune Telling
bitmasks
,
math
1400
x16568
1633F
Perfect Matching
data structures
,
divide and conquer
,
interactive
,
trees
2800
x318
1633E
Spanning Tree Queries
binary search
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1525
1633D
Make Them Equal
dp
,
greedy
1600
x14021
1632E2
Distance Tree (hard version)
binary search
,
dfs and similar
,
shortest paths
,
trees
2700
x980
1632E1
Distance Tree (easy version)
binary search
,
data structures
,
dfs and similar
,
graphs
,
shortest paths
,
trees
2400
x1161
1632D
New Year Concert
binary search
,
data structures
,
greedy
,
math
,
number theory
,
two pointers
2000
x4658
1632C
Strange Test
binary search
,
bitmasks
,
brute force
,
dp
,
math
1600
x12711
1630F
Making It Bipartite
flows
,
graph matchings
,
graphs
,
number theory
3400
x571
1630E
Expected Components
combinatorics
,
math
,
number theory
,
probabilities
2900
x437
1630D
Flipping Range
constructive algorithms
,
dp
,
greedy
,
number theory
2400
x1634
1630C
Paint the Middle
dp
,
greedy
,
sortings
,
two pointers
2200
x2938
1630B
Range and Partition
binary search
,
constructive algorithms
,
data structures
,
greedy
,
two pointers
1800
x5738
1630A
And Matching
bitmasks
,
constructive algorithms
1500
x14525
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x88
1628E
Groceries in Meteor Town
binary search
,
data structures
,
dsu
,
trees
3100
x882
1628D2
Game on Sum (Hard Version)
combinatorics
,
dp
,
games
,
math
2400
x2061
1628D1
Game on Sum (Easy Version)
combinatorics
,
dp
,
games
,
math
2100
x3142
1628C
Grid Xor
constructive algorithms
,
greedy
,
implementation
,
interactive
,
math
2300
x3179
1628B
Peculiar Movie Preferences
greedy
,
strings
1700
x11585
1628A
Meximum Array
binary search
,
constructive algorithms
,
greedy
,
implementation
,
math
,
two pointers
1400
x15597
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x587
1627E
Not Escaping
data structures
,
dp
,
implementation
,
shortest paths
,
two pointers
2200
x2373
1627D
Not Adding
brute force
,
dp
,
math
,
number theory
1900
x8271
1627C
Not Assigning
constructive algorithms
,
dfs and similar
,
number theory
,
trees
1400
x14493
1626F
A Random Code Problem
combinatorics
,
dp
,
math
,
number theory
,
probabilities
2800
x729
1626E
Black and White Tree
dfs and similar
,
greedy
,
trees
2400
x1571
1626D
Martial Arts Tournament
binary search
,
brute force
,
greedy
,
math
2100
x3916
1626C
Monsters And Spells
binary search
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1700
x10903
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
x1041
1625D
Binary Spiders
bitmasks
,
data structures
,
implementation
,
math
,
sortings
,
trees
2300
x2050
1625C
Road Optimization
dp
1700
x10620
1624G
MinOr Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
greedy
1900
x5908
1624F
Interacdive Problem
binary search
,
constructive algorithms
,
interactive
2000
x3301
1624E
Masha-forgetful
brute force
,
constructive algorithms
,
dp
,
hashing
,
implementation
,
strings
2000
x4090
1624D
Palindromes Coloring
binary search
,
greedy
,
sortings
,
strings
1400
x16968
1623E
Middle Duplication
data structures
,
dfs and similar
,
greedy
,
strings
,
trees
2500
x1097
1623D
Robot Cleaner Revisit
implementation
,
math
,
probabilities
2300
x1376
1623C
Balanced Stone Heaps
binary search
,
greedy
1600
x12109
1622F
Quadratic Set
constructive algorithms
,
hashing
,
math
,
number theory
2900
x654
1622E
Math Test
bitmasks
,
brute force
,
greedy
2200
x1896
1622D
Shuffle
combinatorics
,
math
,
two pointers
2000
x4045
1622C
Set or Decrease
binary search
,
brute force
,
greedy
,
sortings
1600
x13055
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x116
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x179
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
x4061
1621C
Hidden Permutations
dfs and similar
,
interactive
,
math
1700
x6895
1621B
Integers Shop
data structures
,
greedy
,
implementation
1500
x13395
1620G
Subsequences Galore
bitmasks
,
combinatorics
,
dp
2400
x894
1620F
Bipartite Array
dp
,
greedy
2800
x604
1620E
Replace the Numbers
constructive algorithms
,
data structures
,
dsu
,
implementation
1900
x8252
1620D
Exact Change
brute force
,
constructive algorithms
,
greedy
2000
x4190
1620C
BA-String
brute force
,
dp
,
greedy
,
implementation
,
math
1800
x6563
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1139
1619G
Unusual Minesweeper
binary search
,
dfs and similar
,
dsu
,
greedy
,
sortings
2000
x2398
1619F
Let's Play the Hat?
brute force
,
constructive algorithms
,
greedy
,
math
2000
x2094
1619E
MEX and Increments
constructive algorithms
,
data structures
,
dp
,
greedy
,
implementation
,
math
,
sortings
1700
x9155
1619D
New Year's Problem
binary search
,
greedy
,
sortings
1800
x7532
1618G
Trader Problem
data structures
,
dsu
,
greedy
,
sortings
2200
x1568
1618F
Reverse
bitmasks
,
constructive algorithms
,
dfs and similar
,
implementation
,
math
,
strings
2000
x4203
1618E
Singers' Tour
constructive algorithms
,
math
1700
x7166
1617E
Christmas Chocolates
dfs and similar
,
dp
,
games
,
graphs
,
implementation
,
math
,
number theory
,
shortest paths
,
trees
2700
x869
1617D2
Too Many Impostors (hard version)
constructive algorithms
,
implementation
,
interactive
,
math
2400
x1783
1617D1
Too Many Impostors (easy version)
constructive algorithms
,
implementation
,
interactive
1800
x4675
1616H
Keep XOR Low
bitmasks
,
combinatorics
,
data structures
,
divide and conquer
,
dp
,
math
3000
x944
1616G
Just Add an Edge
dfs and similar
,
dp
,
graphs
3500
x280
1616F
Tricolor Triangles
brute force
,
graphs
,
math
,
matrices
2900
x593
1616E
Lexicographically Small Enough
brute force
,
data structures
,
greedy
,
strings
2200
x2482
1616D
Keep the Average High
dp
,
greedy
,
math
2000
x4886
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x12218
1615H
Reindeer Games
binary search
,
constructive algorithms
,
data structures
,
divide and conquer
,
flows
,
graphs
,
shortest paths
3000
x327
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x150
1615F
LEGOndary Grandmaster
combinatorics
,
dp
,
math
2800
x872
1615E
Purple Crayon
data structures
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
,
sortings
,
trees
2400
x1477
1615D
X(or)-mas Tree
bitmasks
,
dfs and similar
,
dsu
,
graphs
,
trees
2200
x1887
1615C
Menorah
brute force
,
graphs
,
greedy
,
math
1600
x8368
1614E
Divan and a Cottage
binary search
,
data structures
2600
x826
1614D2
Divan and Kostomuksha (hard version)
dp
,
number theory
2300
x2337
1614D1
Divan and Kostomuksha (easy version)
dp
,
number theory
2100
x3883
1614C
Divan and bitwise operations
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
math
1500
x10235
1613F
Tree Coloring
combinatorics
,
divide and conquer
,
fft
2600
x686
1613E
Crazy Robot
dfs and similar
,
graphs
2000
x5162
1613D
MEX Sequences
dp
,
math
1900
x4600
1612G
Max Sum Array
combinatorics
,
constructive algorithms
,
greedy
,
sortings
2500
x840
1612F
Armor and Weapons
brute force
,
dp
,
greedy
,
shortest paths
2800
x611
1612E
Messages
brute force
,
dp
,
greedy
,
probabilities
,
sortings
2000
x2501
1612D
X-Magic Pair
math
,
number theory
1600
x9129
1611G
Robot and Candies
data structures
,
graph matchings
,
greedy
2500
x643
1611F
ATM and Students
binary search
,
data structures
,
two pointers
1800
x6442
1611E2
Escape The Maze (hard version)
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1900
x3817
1611E1
Escape The Maze (easy version)
dfs and similar
,
greedy
,
shortest paths
,
trees
,
two pointers
1700
x7264
1611D
Weights Assignment For Tree Edges
constructive algorithms
,
trees
1500
x9845
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