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Before contest
Codeforces Round #793 (Div. 2)
12:20:15
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Difficulty:
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brute force
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
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x28
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x37
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x42
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x42
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x51
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x53
73F
Plane of Tanks
brute force
,
geometry
2900
x54
126E
Pills
brute force
,
flows
2900
x57
1302F
Keep talking and nobody explodes -- easy
bitmasks
,
brute force
,
expression parsing
x68
109E
Lucky Interval
brute force
,
math
2700
x73
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x75
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x78
1120E
The very same Munchhausen
brute force
2600
x78
1017H
The Films
brute force
3300
x78
1508F
Optimal Encoding
brute force
,
data structures
3500
x79
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x79
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x89
1320F
Blocks and Sensors
brute force
3500
x94
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x101
1250I
Show Must Go On
binary search
,
brute force
,
greedy
,
shortest paths
3100
x112
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x113
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x116
1167G
Low Budget Inception
brute force
,
geometry
3100
x118
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x128
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x128
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x129
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x130
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x133
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x138
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x139
1271F
Divide The Students
brute force
2700
x143
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x146
309D
Tennis Rackets
brute force
,
geometry
2700
x154
86E
Long sequence
brute force
,
math
,
matrices
2700
x154
105E
Lift and Throw
brute force
2500
x155
44I
Toys
brute force
,
combinatorics
2300
x157
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x159
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x162
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x166
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x166
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x166
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x171
391C1
The Tournament
brute force
x171
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x173
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x174
1651F
Tower Defense
binary search
,
brute force
,
data structures
3000
x175
1519F
Chests and Keys
bitmasks
,
brute force
,
dfs and similar
,
dp
,
flows
3200
x185
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x185
64E
Prime Segment
*special problem
,
brute force
1800
x186
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x187
391D1
Supercollider
brute force
x189
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x191
164D
Minimum Diameter
binary search
,
brute force
3100
x195
1495E
Qingshan and Daniel
brute force
,
data structures
,
greedy
,
implementation
3200
x199
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x199
497D
Gears
brute force
,
geometry
,
math
2900
x202
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x207
152D
Frames
brute force
2600
x214
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x215
666D
Chain Reaction
brute force
,
geometry
3000
x215
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x221
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x222
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x223
97A
Domino
brute force
,
implementation
2400
x223
1340F
Nastya and CBS
brute force
,
data structures
,
hashing
3300
x227
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x229
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x235
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x236
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x239
105C
Item World
brute force
,
implementation
,
sortings
2200
x239
241F
Race
brute force
,
implementation
2300
x245
1268D
Invertation in Tournament
brute force
,
divide and conquer
,
graphs
,
math
3200
x246
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x246
394D
Physical Education and Buns
brute force
,
implementation
,
math
x246
436F
Banners
brute force
,
data structures
,
dp
3000
x254
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x254
750G
New Year and Binary Tree Paths
bitmasks
,
brute force
,
combinatorics
,
dp
3200
x257
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x258
1511F
Chainword
brute force
,
data structures
,
dp
,
matrices
,
string suffix structures
,
strings
2700
x260
1578K
Kingdom of Islands
brute force
,
graphs
,
implementation
2800
x266
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x267
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x267
568D
Sign Posts
brute force
,
geometry
,
math
2800
x270
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x271
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x275
1192C
Cubeword
*special problem
,
brute force
,
dp
,
meet-in-the-middle
x275
1155F
Delivery Oligopoly
brute force
,
dp
,
graphs
2800
x275
68C
Synchrophasotron
brute force
2200
x275
335D
Rectangles and Square
brute force
,
dp
2400
x276
1334G
Substring Search
bitmasks
,
brute force
,
fft
2900
x282
60D
Savior
brute force
,
dsu
,
math
2500
x287
1535F
String Distance
binary search
,
brute force
,
data structures
,
hashing
,
implementation
,
strings
3000
x292
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x293
1033F
Boolean Computer
bitmasks
,
brute force
,
fft
,
math
2800
x294
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x294
852A
Digits
brute force
,
implementation
,
math
2500
x295
1600F
Party Organization
brute force
,
math
,
probabilities
2300
x299
850E
Random Elections
bitmasks
,
brute force
,
divide and conquer
,
fft
,
math
2800
x301
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x302
1036G
Sources and Sinks
bitmasks
,
brute force
,
dfs and similar
2700
x304
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