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Before contest
Codeforces Round #813 (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
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
1517H
Fly Around the World
dp
,
geometry
3500
x44
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x45
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x49
1641F
Covering Circle
geometry
3500
x56
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x59
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x62
1071E
Rain Protection
binary search
,
geometry
3500
x80
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x83
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x85
1220G
Geolocation
geometry
3400
x31
853E
Lada Malina
data structures
,
geometry
3400
x51
1045F
Shady Lady
geometry
,
math
3400
x80
949F
Astronomy
geometry
,
probabilities
3300
x40
1578I
Interactive Rays
geometry
,
interactive
3300
x43
771F
Bear and Isomorphic Points
geometry
,
two pointers
3300
x67
1381E
Origami
geometry
,
math
,
sortings
3300
x76
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x97
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x138
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x198
704E
Iron Man
data structures
,
geometry
,
trees
3300
x207
607E
Cross Sum
binary search
,
geometry
3300
x210
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x261
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x97
744D
Hongcow Draws a Circle
geometry
3200
x98
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x102
1584G
Eligible Segments
geometry
3200
x151
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x172
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x216
269E
String Theory
geometry
,
math
,
strings
3100
x90
1666G
Global Warming
geometry
,
math
3100
x92
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x102
388E
Fox and Meteor Shower
geometry
3100
x103
1167G
Low Budget Inception
brute force
,
geometry
3100
x120
792F
Mages and Monsters
data structures
,
geometry
3100
x145
442E
Gena and Second Distance
geometry
3100
x145
528E
Triangles 3000
geometry
,
sortings
3100
x187
223D
Spider
geometry
,
graphs
3000
x45
1218B
Guarding warehouses
data structures
,
geometry
3000
x51
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x52
142E
Help Greg the Dwarf 2
geometry
3000
x59
154E
Martian Colony
geometry
3000
x75
852H
Bob and stages
dp
,
geometry
3000
x98
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x125
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x145
1572E
Polygon
binary search
,
dp
,
geometry
3000
x167
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x216
666D
Chain Reaction
brute force
,
geometry
3000
x219
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x324
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x30
68E
Contact
geometry
2900
x51
73F
Plane of Tanks
brute force
,
geometry
2900
x54
128E
Birthday
geometry
,
math
2900
x75
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x89
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x98
1578F
Framing Pictures
geometry
2900
x130
497D
Gears
brute force
,
geometry
,
math
2900
x202
886F
Symmetric Projections
geometry
2900
x235
598F
Cut Length
geometry
2900
x279
1146H
Satanic Panic
dp
,
geometry
2900
x286
603D
Ruminations on Ruminants
geometry
,
math
2900
x291
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x307
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x364
611G
New Year and Cake
geometry
,
two pointers
2900
x378
28E
DravDe saves the world
geometry
,
math
2800
x60
962G
Visible Black Areas
data structures
,
dsu
,
geometry
,
trees
2800
x95
887E
Little Brother
binary search
,
geometry
,
sortings
2800
x107
717I
Cowboy Beblop at his computer
geometry
2800
x188
575E
Spectator Riots
geometry
2800
x202
568D
Sign Posts
brute force
,
geometry
,
math
2800
x271
77E
Martian Food
geometry
2800
x284
377E
Cookie Clicker
dp
,
geometry
2800
x308
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x326
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x338
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x421
44F
BerPaint
geometry
,
graphs
2700
x51
1423E
5G Antenna Towers
geometry
2700
x53
107E
Darts
geometry
,
probabilities
2700
x102
549E
Sasha Circle
geometry
,
math
2700
x128
54E
Vacuum Сleaner
geometry
2700
x144
958E3
Guard Duty (hard)
geometry
2700
x155
309D
Tennis Rackets
brute force
,
geometry
2700
x155
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x168
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x182
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x197
989E
A Trance of Nightfall
dp
,
geometry
,
matrices
,
probabilities
2700
x206
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x295
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x296
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x296
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x337
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x440
933C
A Colourful Prospect
geometry
,
graphs
2700
x471
1366F
Jog Around The Graph
binary search
,
dp
,
geometry
,
graphs
2700
x498
1019D
Large Triangle
binary search
,
geometry
,
sortings
2700
x514
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x518
1025F
Disjoint Triangles
geometry
2700
x520
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x680
70D
Professor's task
data structures
,
geometry
2700
x714
932F
Escape Through Leaf
data structures
,
dp
,
geometry
2700
x1648
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x160
420E
Playing the ball
geometry
2600
x166
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