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Codeforces Round 940 (Div. 2) and CodeCraft-23
2 days
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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
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x63
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x63
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x66
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x72
1302F
Keep talking and nobody explodes -- easy
bitmasks
,
brute force
,
expression parsing
x72
1949E
Damage per Second
brute force
,
math
x73
73F
Plane of Tanks
brute force
,
geometry
2900
x73
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x75
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x76
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x79
126E
Pills
brute force
,
flows
2900
x81
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x83
1097H
Mateusz and an Infinite Sequence
bitmasks
,
brute force
,
dp
,
strings
3400
x91
109E
Lucky Interval
brute force
,
math
2700
x97
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x101
1854F
Mark and Spaceship
brute force
,
dp
3500
x107
1120E
The very same Munchhausen
brute force
2600
x109
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x114
1769D3
Игра в Девятку III
*special problem
,
brute force
2300
x115
1508F
Optimal Encoding
brute force
,
data structures
3500
x115
865E
Hex Dyslexia
bitmasks
,
brute force
,
dp
,
graphs
3300
x117
1250I
Show Must Go On
binary search
,
brute force
,
greedy
,
shortest paths
3100
x126
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x129
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x129
662E
To Hack or not to Hack
brute force
,
dp
,
greedy
3100
x129
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x133
1017H
The Films
brute force
3300
x136
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x141
1167G
Low Budget Inception
brute force
,
geometry
3100
x145
1320F
Blocks and Sensors
brute force
3500
x148
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x150
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x159
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x162
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x163
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x165
309D
Tennis Rackets
brute force
,
geometry
2700
x170
86E
Long sequence
brute force
,
math
,
matrices
2700
x177
105E
Lift and Throw
brute force
2500
x178
44I
Toys
brute force
,
combinatorics
2300
x180
391C1
The Tournament
brute force
x182
1753F
Minecraft Series
brute force
,
two pointers
3500
x184
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x185
1271F
Divide The Students
brute force
2700
x185
1769D2
Игра в Девятку II
*special problem
,
brute force
2200
x186
1210F1
Marek and Matching (easy version)
brute force
,
probabilities
3100
x186
1210F2
Marek and Matching (hard version)
brute force
,
probabilities
3200
x187
363E
Two Circles
brute force
,
data structures
,
implementation
2500
x191
280E
Sequence Transformation
brute force
,
data structures
,
dp
,
implementation
,
math
3000
x195
391D1
Supercollider
brute force
x200
478E
Wavy numbers
brute force
,
dfs and similar
,
meet-in-the-middle
,
sortings
2900
x203
1515H
Phoenix and Bits
bitmasks
,
brute force
,
data structures
,
sortings
3500
x204
575C
Party
bitmasks
,
brute force
,
graph matchings
2700
x210
1578J
Just Kingdom
brute force
,
data structures
,
dfs and similar
3100
x216
497D
Gears
brute force
,
geometry
,
math
2900
x222
1569F
Palindromic Hamiltonian Path
brute force
,
dfs and similar
,
dp
,
graphs
,
hashing
3000
x225
164D
Minimum Diameter
binary search
,
brute force
3100
x228
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x228
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x230
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x233
869D
The Overdosing Ubiquity
brute force
,
dfs and similar
,
graphs
2800
x234
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x236
1056G
Take Metro
brute force
,
data structures
,
graphs
2900
x237
152D
Frames
brute force
2600
x237
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x241
1817E
Half-sum
brute force
,
divide and conquer
,
greedy
3400
x246
97A
Domino
brute force
,
implementation
2400
x249
1181E2
A Story of One Country (Hard)
brute force
,
greedy
,
sortings
3000
x257
666D
Chain Reaction
brute force
,
geometry
3000
x257
241F
Race
brute force
,
implementation
2300
x258
1540D
Inverse Inversions
binary search
,
brute force
,
data structures
3200
x259
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x259
394D
Physical Education and Buns
brute force
,
implementation
,
math
x261
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x263
1031F
Familiar Operations
brute force
,
graphs
,
math
2800
x263
105C
Item World
brute force
,
implementation
,
sortings
2200
x268
933D
A Creative Cutout
brute force
,
combinatorics
,
math
2900
x278
753C
Interactive Bulls and Cows (Hard)
brute force
,
constructive algorithms
,
interactive
2500
x278
1336E2
Chiori and Doll Picking (hard version)
bitmasks
,
brute force
,
combinatorics
,
math
3500
x280
1599J
Bob's Beautiful Array
bitmasks
,
brute force
,
greedy
2600
x282
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x288
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x292
991F
Concise and clear
brute force
,
greedy
,
implementation
,
math
2700
x293
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x297
568D
Sign Posts
brute force
,
geometry
,
math
2800
x297
294D
Shaass and Painter Robot
brute force
,
implementation
,
number theory
2500
x297
68C
Synchrophasotron
brute force
2200
x302
335D
Rectangles and Square
brute force
,
dp
2400
x303
1753E
N Machines
binary search
,
brute force
,
greedy
3300
x305
679D
Bear and Chase
brute force
,
dfs and similar
,
graphs
,
implementation
,
math
,
probabilities
2900
x310
1847E
Triangle Platinum?
brute force
,
combinatorics
,
implementation
,
interactive
,
math
,
probabilities
2900
x311
1923F
Shrink-Reverse
binary search
,
brute force
,
greedy
,
hashing
,
implementation
,
string suffix structures
,
strings
2800
x313
1671F
Permutation Counting
brute force
,
combinatorics
,
dp
,
fft
,
math
2700
x313
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x314
1525F
Goblins And Gnomes
brute force
,
dp
,
flows
,
graph matchings
2800
x315
1571D
Sweepstake
*special problem
,
brute force
,
constructive algorithms
,
implementation
,
math
1800
x316
193E
Fibonacci Number
brute force
,
math
,
matrices
2900
x319
1192C
Cubeword
*special problem
,
brute force
,
dp
,
meet-in-the-middle
x322
1508E
Tree Calendar
brute force
,
constructive algorithms
,
data structures
,
dfs and similar
,
sortings
,
trees
3100
x323
1494F
Delete The Edges
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
2900
x324
1531E2
Сортировка слиянием
*special problem
,
*special problem
,
brute force
x331
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