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Before contest
Codeforces Round (Div. 3)
6 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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Problems
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Status
Standings
Custom test
Problems
#
Name
842B
Gleb And Pizza
geometry
1100
x10126
820B
Mister B and Angle in Polygon
constructive algorithms
,
geometry
,
math
1300
x5092
815D
Karen and Cards
binary search
,
combinatorics
,
data structures
,
geometry
2800
x599
814D
An overnight dance in discotheque
dfs and similar
,
dp
,
geometry
,
greedy
,
trees
2000
x2127
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x111
794B
Cutting Carrot
geometry
,
math
1200
x6370
793C
Mice problem
geometry
,
implementation
,
math
,
sortings
2300
x1235
792F
Mages and Monsters
data structures
,
geometry
3100
x201
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x117
776F
Sherlock's bet to Moriarty
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
,
trees
2800
x420
772B
Volatile Kite
geometry
1800
x3102
771F
Bear and Isomorphic Points
geometry
,
two pointers
3300
x80
766B
Mahmoud and a Triangle
constructive algorithms
,
geometry
,
greedy
,
math
,
number theory
,
sortings
1000
x31500
763B
Timofey and rectangles
constructive algorithms
,
geometry
2100
x2631
750B
New Year and North Pole
geometry
,
implementation
1300
x9435
749B
Parallelogram is Back
brute force
,
constructive algorithms
,
geometry
1200
x8424
744D
Hongcow Draws a Circle
geometry
3200
x119
717I
Cowboy Beblop at his computer
geometry
2800
x203
706A
Beru-taxi
brute force
,
geometry
,
implementation
900
x14325
704E
Iron Man
data structures
,
geometry
,
trees
3300
x279
703C
Chris and Road
geometry
,
implementation
2100
x1695
698D
Limak and Shooting Points
brute force
,
geometry
,
math
2600
x512
696F
...Dary!
binary search
,
geometry
,
two pointers
3300
x120
690B2
Recover Polygon (medium)
geometry
2600
x197
689E
Mike and Geometry Problem
combinatorics
,
data structures
,
dp
,
geometry
,
implementation
2000
x1822
683A
The Check of the Point
*special problem
,
geometry
1200
x787
682E
Alyona and Triangles
geometry
,
two pointers
2600
x648
681E
Runaway to a Shadow
geometry
,
sortings
2500
x457
678F
Lena and Queries
data structures
,
divide and conquer
,
geometry
2500
x849
671A
Recycling Bottles
dp
,
geometry
,
greedy
,
implementation
1800
x4117
667B
Coat of Anticubism
constructive algorithms
,
geometry
1100
x5466
667A
Pouring Rain
geometry
,
math
1100
x7820
666D
Chain Reaction
brute force
,
geometry
3000
x275
660F
Bear and Bowling 4
binary search
,
data structures
,
divide and conquer
,
geometry
,
ternary search
2500
x1539
660D
Number of Parallelograms
geometry
1900
x3879
659D
Bicycle Race
geometry
,
implementation
,
math
1500
x6163
650A
Watchmen
data structures
,
geometry
,
math
1400
x15152
645G
Armistice Area Apportionment
binary search
,
geometry
3200
x112
631E
Product Sum
data structures
,
dp
,
geometry
2600
x2259
630Q
Pyramids
geometry
,
math
1700
x1236
630P
Area of a Star
geometry
2100
x1082
630O
Arrow
geometry
2000
x740
630M
Turn
geometry
,
math
1800
x1118
618E
Robot Arm
data structures
,
geometry
2500
x587
618C
Constellation
geometry
,
implementation
1600
x4179
613A
Peter and Snow Blower
binary search
,
geometry
,
ternary search
1900
x3189
611G
New Year and Cake
geometry
,
two pointers
2900
x426
610D
Vika and Segments
constructive algorithms
,
data structures
,
geometry
,
two pointers
2300
x1456
607E
Cross Sum
binary search
,
geometry
3300
x250
605C
Freelancer's Dreams
geometry
2400
x1099
603D
Ruminations on Ruminants
geometry
,
math
2900
x339
600D
Area of Two Circles' Intersection
geometry
2000
x2158
598F
Cut Length
geometry
2900
x362
598C
Nearest vectors
geometry
,
sortings
2300
x4196
596A
Wilbur and Swimming Pool
geometry
,
implementation
1100
x7638
594B
Max and Bike
binary search
,
geometry
2500
x476
593B
Anton and Lines
geometry
,
sortings
1600
x3951
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x213
590B
Chip 'n Dale Rescue Rangers
binary search
,
geometry
,
math
2100
x1756
581D
Three Logos
bitmasks
,
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3484
578A
A Problem about Polyline
geometry
,
math
1700
x4699
576C
Points on Plane
constructive algorithms
,
divide and conquer
,
geometry
,
greedy
,
sortings
2100
x3246
575E
Spectator Riots
geometry
2800
x239
568D
Sign Posts
brute force
,
geometry
,
math
2800
x301
566G
Max and Min
geometry
2500
x334
559D
Randomizer
combinatorics
,
geometry
,
probabilities
2800
x424
559A
Gerald's Hexagon
brute force
,
geometry
,
math
1600
x10314
552D
Vanya and Triangles
brute force
,
combinatorics
,
data structures
,
geometry
,
math
,
sortings
1900
x4372
549E
Sasha Circle
geometry
,
math
2700
x146
535E
Tavas and Pashmaks
geometry
,
math
2600
x799
530H
Points in triangle
*special problem
,
geometry
2100
x120
528E
Triangles 3000
geometry
,
sortings
3100
x215
514B
Han Solo and Lazer Gun
brute force
,
data structures
,
geometry
,
implementation
,
math
1400
x20331
507B
Amr and Pins
geometry
,
math
1400
x24009
498A
Crazy Town
geometry
1700
x6358
497D
Gears
brute force
,
geometry
,
math
2900
x226
474C
Captain Marmot
brute force
,
geometry
2000
x3078
464B
Restore Cube
brute force
,
geometry
2000
x1667
460E
Roland and Rose
brute force
,
geometry
,
math
,
sortings
2700
x340
452B
4-point polyline
brute force
,
constructive algorithms
,
geometry
,
trees
1800
x1981
442E
Gena and Second Distance
geometry
3100
x171
437E
The Child and Polygon
dp
,
geometry
2500
x692
429D
Tricky Function
data structures
,
divide and conquer
,
geometry
2200
x2611
420E
Playing the ball
geometry
2600
x214
409G
On a plane
*special problem
,
geometry
2200
x504
407A
Triangle
brute force
,
geometry
,
implementation
,
math
1600
x4765
406D
Hill Climbing
dfs and similar
,
geometry
,
trees
2200
x1133
394E
Lightbulb for Minister
geometry
x115
388E
Fox and Meteor Shower
geometry
3100
x120
385D
Bear and Floodlight
bitmasks
,
dp
,
geometry
2200
x800
379E
New Year Tree Decorations
geometry
,
schedules
,
sortings
2500
x338
377E
Cookie Clicker
dp
,
geometry
2800
x447
374E
Inna and Babies
binary search
,
data structures
,
dsu
,
geometry
,
implementation
2600
x179
372E
Drawing Circles is Fun
combinatorics
,
geometry
3000
x170
350D
Looking for Owls
binary search
,
data structures
,
geometry
,
hashing
,
sortings
2400
x258
342C
Cupboard and Balloons
geometry
1900
x1819
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2030
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1077
319C
Kalila and Dimna in the Logging Industry
dp
,
geometry
2100
x4838
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x517
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