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Codeforces Round 976 (Div. 2) and Divide By Zero 9.0
08:01:38
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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
1804H
Code Lock
bitmasks
,
dp
3300
x185
1804G
Flow Control
data structures
,
dsu
,
implementation
3500
x202
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x910
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1446
1804D
Accommodation
brute force
,
dp
,
greedy
,
implementation
2000
x4633
1804C
Pull Your Luck
brute force
,
greedy
,
math
,
number theory
1500
x12099
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x374
1801F
Another n-dimensional chocolate bar
dp
,
math
,
meet-in-the-middle
,
number theory
2700
x585
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x449
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2207
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3425
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x6221
1801A
The Very Beautiful Blanket
bitmasks
,
constructive algorithms
1600
x8548
1800G
Symmetree
dfs and similar
,
hashing
,
implementation
,
trees
2200
x2066
1800F
Dasha and Nightmares
bitmasks
,
hashing
,
meet-in-the-middle
,
strings
1900
x3882
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x12775
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x12798
1799H
Tree Cutting
bitmasks
,
dfs and similar
,
dp
3200
x280
1799G
Count Voting
combinatorics
,
dp
,
math
2600
x765
1799F
Halve or Subtract
binary search
,
brute force
,
dp
,
greedy
,
sortings
2700
x833
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1200
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2440
1799D1
Hot Start Up (easy version)
dp
1900
x4460
1799C
Double Lexicographically Minimum
greedy
,
strings
1700
x5802
1798F
Gifts from Grandfather Ahmed
dp
,
math
,
number theory
2500
x495
1798E
Multitest Generator
brute force
,
dp
2300
x1598
1798D
Shocking Arrangement
constructive algorithms
,
greedy
,
math
1600
x9811
1798C
Candy Store
greedy
,
math
,
number theory
1700
x8175
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x352
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1269
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3947
1797C
Li Hua and Chess
constructive algorithms
,
greedy
,
interactive
1600
x7618
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x172
1796E
Colored Subgraphs
dfs and similar
,
dp
,
games
,
greedy
,
trees
2500
x750
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x4301
1796C
Maximum Set
binary search
,
math
1600
x10391
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x683
1795F
Blocking Chips
binary search
,
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2400
x1108
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x2012
1795D
Triangle Coloring
combinatorics
,
math
1600
x9111
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x12403
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1088
1794D
Counting Factorizations
combinatorics
,
divide and conquer
,
dp
,
math
,
number theory
1900
x3579
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1377
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x1059
1793D
Moscow Gorillas
binary search
,
dp
,
greedy
,
implementation
,
math
,
two pointers
1800
x6119
1792F2
Graph Coloring (hard version)
brute force
,
combinatorics
,
divide and conquer
,
dp
,
fft
,
graphs
2900
x390
1792F1
Graph Coloring (easy version)
combinatorics
,
dp
,
graphs
2700
x720
1792E
Divisors and Table
brute force
,
dfs and similar
,
dp
,
number theory
2400
x1382
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x6248
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x14085
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4778
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x12392
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1120
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3346
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x15093
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x715
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x817
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1675
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8545
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x842
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2664
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3905
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x166
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x230
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x435
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x678
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2341
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3391
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x7068
1784F
Minimums or Medians
3400
x234
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x337
1784D
Wooden Spoon
combinatorics
,
dp
2400
x1021
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1652
1784B
Letter Exchange
constructive algorithms
1900
x3331
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x478
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x1016
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2103
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4419
1783C
Yet Another Tournament
binary search
,
greedy
,
sortings
1700
x9284
1781H2
Window Signals (hard version)
3500
x91
1781H1
Window Signals (easy version)
3200
x116
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x222
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x862
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1302
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5488
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7583
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x721
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1475
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1426
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x4929
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x142
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x319
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1259
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1758
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7892
1779C
Least Prefix Sum
data structures
,
greedy
1600
x12370
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x656
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x874
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2754
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