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Before contest
Codeforces Round 940 (Div. 2) and CodeCraft-23
38:29:44
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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
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Custom test
Problems
#
Name
1952I
Dark Matter
bitmasks
,
geometry
x301
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
x1034
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x75
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x5229
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x9036
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x14
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x62
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5901
1928A
Rectangle Cutting
geometry
,
math
800
x20883
1926B
Vlad and Shapes
geometry
,
implementation
800
x29154
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1021
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x390
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7802
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x53
1906D
Spaceship Exploration
binary search
,
geometry
2800
x85
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x141
1886B
Fear of the Dark
binary search
,
geometry
,
math
1200
x15028
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x14215
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x402
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x262
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x11099
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x20560
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x18215
1845B
Come Together
geometry
,
implementation
,
math
900
x20774
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1519
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x467
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x335
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3402
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16889
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3930
1806A
Walking Master
geometry
,
greedy
,
math
800
x22058
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x11953
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1147
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x21095
1791B
Following Directions
geometry
,
implementation
800
x41492
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x196
1781A
Parallel Projection
geometry
,
math
800
x14828
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x633
1776B
Vittorio Plays with LEGO Bricks
dp
,
geometry
2200
x1236
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x586
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x103
1740B
Jumbo Extra Cheese 2
geometry
,
greedy
,
sortings
800
x13509
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2383
1735F
Pebbles and Beads
data structures
,
geometry
2900
x214
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x11749
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x78
1725G
Garage
binary search
,
geometry
,
math
1500
x5569
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1529
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x498
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1591
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x21621
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2344
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1131
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x263
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x4014
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x4935
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1377
1666G
Global Warming
geometry
,
math
3100
x132
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x3067
1662K
Pandemic Restrictions
geometry
,
ternary search
x303
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11659
1642A
Hard Way
geometry
800
x15890
1641F
Covering Circle
geometry
3500
x93
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x84
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x550
1622A
Construct a Rectangle
geometry
,
math
800
x29400
1620B
Triangles on a Rectangle
geometry
,
greedy
,
math
1000
x19467
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x11924
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x355
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8370
1584G
Eligible Segments
geometry
3200
x201
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1578F
Framing Pictures
geometry
2900
x148
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x232
1575B
Building an Amusement Park
binary search
,
geometry
2300
x448
1572E
Polygon
binary search
,
dp
,
geometry
3000
x276
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x44
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5764
1550C
Manhattan Subarrays
brute force
,
geometry
,
greedy
,
implementation
1700
x9913
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x236
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1425
1539A
Contest Start
combinatorics
,
geometry
,
greedy
,
math
1000
x19553
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x909
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x510
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x797
1517H
Fly Around the World
dp
,
geometry
3500
x63
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x24060
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x522
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x125
1495A
Diamond Miner
geometry
,
greedy
,
math
,
sortings
1200
x16633
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x15162
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x2194
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x468
1468G
Hobbits
binary search
,
geometry
2500
x796
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3582
1466A
Bovine Dilemma
brute force
,
geometry
,
math
800
x22250
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1422
1451D
Circle Game
games
,
geometry
,
math
1700
x9229
1450B
Balls of Steel
brute force
,
geometry
,
greedy
1000
x14854
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