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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
32:03:44
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Difficulty:
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geometry
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
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shortest paths
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ternary search
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Problems
#
Name
1517H
Fly Around the World
dp
,
geometry
3500
x63
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x68
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x69
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x75
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x78
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1071E
Rain Protection
binary search
,
geometry
3500
x88
1641F
Covering Circle
geometry
3500
x93
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x103
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x106
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x125
1220G
Geolocation
geometry
3400
x47
853E
Lada Malina
data structures
,
geometry
3400
x63
1045F
Shady Lady
geometry
,
math
3400
x91
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x53
949F
Astronomy
geometry
,
probabilities
3300
x56
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x62
771F
Bear and Isomorphic Points
geometry
,
two pointers
3300
x77
1381E
Origami
geometry
,
math
,
sortings
3300
x99
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x118
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x196
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x236
607E
Cross Sum
binary search
,
geometry
3300
x244
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x263
704E
Iron Man
data structures
,
geometry
,
trees
3300
x271
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x510
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x110
744D
Hongcow Draws a Circle
geometry
3200
x115
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x117
1584G
Eligible Segments
geometry
3200
x201
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x267
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x395
269E
String Theory
geometry
,
math
,
strings
3100
x106
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x115
388E
Fox and Meteor Shower
geometry
3100
x118
1666G
Global Warming
geometry
,
math
3100
x132
1167G
Low Budget Inception
brute force
,
geometry
3100
x145
442E
Gena and Second Distance
geometry
3100
x167
792F
Mages and Monsters
data structures
,
geometry
3100
x198
528E
Triangles 3000
geometry
,
sortings
3100
x213
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x63
1218B
Guarding warehouses
data structures
,
geometry
3000
x67
223D
Spider
geometry
,
graphs
3000
x67
142E
Help Greg the Dwarf 2
geometry
3000
x78
154E
Martian Colony
geometry
3000
x87
852H
Bob and stages
dp
,
geometry
3000
x142
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x168
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x186
666D
Chain Reaction
brute force
,
geometry
3000
x257
1572E
Polygon
binary search
,
dp
,
geometry
3000
x276
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x390
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x425
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x522
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x44
68E
Contact
geometry
2900
x69
73F
Plane of Tanks
brute force
,
geometry
2900
x73
128E
Birthday
geometry
,
math
2900
x95
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x102
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x117
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x141
1578F
Framing Pictures
geometry
2900
x148
1735F
Pebbles and Beads
data structures
,
geometry
2900
x214
497D
Gears
brute force
,
geometry
,
math
2900
x222
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x262
886F
Symmetric Projections
geometry
2900
x262
603D
Ruminations on Ruminants
geometry
,
math
2900
x336
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x347
598F
Cut Length
geometry
2900
x353
611G
New Year and Cake
geometry
,
two pointers
2900
x421
1146H
Satanic Panic
dp
,
geometry
2900
x461
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x533
28E
DravDe saves the world
geometry
,
math
2800
x84
1906D
Spaceship Exploration
binary search
,
geometry
2800
x85
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x124
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x161
717I
Cowboy Beblop at his computer
geometry
2800
x201
575E
Spectator Riots
geometry
2800
x235
568D
Sign Posts
brute force
,
geometry
,
math
2800
x297
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x335
77E
Martian Food
geometry
2800
x361
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x409
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x421
377E
Cookie Clicker
dp
,
geometry
2800
x441
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x590
44F
BerPaint
geometry
,
graphs
2700
x63
1423E
5G Antenna Towers
geometry
2700
x73
107E
Darts
geometry
,
probabilities
2700
x126
549E
Sasha Circle
geometry
,
math
2700
x144
309D
Tennis Rackets
brute force
,
geometry
2700
x170
958E3
Guard Duty (hard)
geometry
2700
x176
54E
Vacuum Сleaner
geometry
2700
x186
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x207
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x207
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x227
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x232
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x333
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x355
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x373
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