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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
40:04:20
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→ Filter Problems
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
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x269
342C
Cupboard and Balloons
geometry
1900
x1858
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2090
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1137
319C
Kalila and Dimna in the Logging Industry
dp
,
geometry
2100
x5280
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x527
309D
Tennis Rackets
brute force
,
geometry
2700
x176
306D
Polygon
constructive algorithms
,
geometry
2300
x284
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x239
280A
Rectangle Puzzle
geometry
2000
x1473
279A
Point on Spiral
brute force
,
geometry
,
implementation
1400
x5619
277B
Set of Points
constructive algorithms
,
geometry
2300
x812
274C
The Last Hole!
brute force
,
geometry
2600
x350
270A
Fancy Fence
geometry
,
implementation
,
math
1100
x45800
269E
String Theory
geometry
,
math
,
strings
3100
x109
257C
View Angle
brute force
,
geometry
,
math
1800
x4389
250D
Building Bridge
geometry
,
ternary search
,
two pointers
1900
x894
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x462
248C
Robo-Footballer
binary search
,
geometry
2000
x855
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x215
241C
Mirror Box
geometry
,
implementation
2000
x512
231D
Magic Box
brute force
,
geometry
1600
x4108
227A
Where do I Turn?
geometry
1300
x4223
224A
Parallelepiped
brute force
,
geometry
,
math
1100
x26970
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x191
223D
Spider
geometry
,
graphs
3000
x70
220D
Little Elephant and Triangle
geometry
,
math
2500
x286
213D
Stars
constructive algorithms
,
geometry
2300
x341
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1418
199B
Special Olympics
geometry
1900
x805
198C
Delivering Carcinogen
binary search
,
geometry
2400
x375
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x960
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x1046
190B
Surrounded
geometry
1800
x2857
183B
Zoo
brute force
,
geometry
1700
x698
182A
Battlefield
geometry
,
graphs
,
implementation
,
shortest paths
2200
x288
181A
Series of Crimes
brute force
,
geometry
,
implementation
800
x7197
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x266
166B
Polygons
geometry
,
sortings
2100
x2476
157B
Trace
geometry
,
sortings
1000
x13251
154E
Martian Colony
geometry
3000
x97
142E
Help Greg the Dwarf 2
geometry
3000
x80
141B
Hopscotch
geometry
,
math
1400
x5407
140F
New Year Snowflake
geometry
,
sortings
2600
x370
140A
New Year Table
geometry
,
math
1700
x4157
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2361
128E
Birthday
geometry
,
math
2900
x99
127A
Wasted Time
geometry
900
x11301
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x933
119E
Alternative Reality
geometry
2400
x95
107E
Darts
geometry
,
probabilities
2700
x138
106E
Space Rescuers
geometry
,
ternary search
2100
x873
100I
Rotation
*special problem
,
geometry
,
math
1500
x351
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x310
91E
Igloo Skyscraper
data structures
,
geometry
2500
x610
89D
Space mines
geometry
2500
x239
87E
Mogohu-Rea Idol
geometry
2600
x603
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x959
82E
Corridor
geometry
2600
x217
80B
Depression
geometry
,
math
1200
x4448
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x330
77E
Martian Food
geometry
2800
x380
75E
Ship's Shortest Path
geometry
,
shortest paths
2400
x280
73F
Plane of Tanks
brute force
,
geometry
2900
x81
70D
Professor's task
data structures
,
geometry
2700
x997
68E
Contact
geometry
2900
x72
67E
Save the City!
geometry
2500
x318
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x789
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x252
55E
Very simple problem
geometry
,
two pointers
2500
x707
54E
Vacuum Сleaner
geometry
2700
x194
50C
Happy Farm 5
geometry
2000
x771
47E
Cannon
data structures
,
geometry
,
sortings
2200
x370
46G
Emperor's Problem
geometry
2500
x117
44F
BerPaint
geometry
,
graphs
2700
x68
40A
Find Color
constructive algorithms
,
geometry
,
implementation
,
math
1300
x4057
36C
Bowls
geometry
,
implementation
2200
x340
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1216
32E
Hide-and-Seek
geometry
,
implementation
2400
x337
30D
King's Problem?
geometry
,
greedy
2600
x453
28E
DravDe saves the world
geometry
,
math
2800
x91
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1264
23D
Tetragon
geometry
,
math
2600
x337
18A
Triangle
brute force
,
geometry
1500
x6100
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3404
13D
Triangles
dp
,
geometry
2600
x667
13B
Letter A
geometry
,
implementation
2000
x1006
9B
Running Student
brute force
,
geometry
,
implementation
1200
x5535
8D
Two Friends
binary search
,
geometry
2600
x528
6A
Triangle
brute force
,
geometry
900
x20032
2C
Commentator problem
geometry
2600
x1773
1C
Ancient Berland Circus
geometry
,
math
2100
x5742
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