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Before contest
Codeforces Round 937 (Div. 4)
01:31:47
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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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Problems
#
Name
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
x801
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
x47
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x12
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x54
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x5640
1928A
Rectangle Cutting
geometry
,
math
800
x20486
1926B
Vlad and Shapes
geometry
,
implementation
800
x28370
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1001
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x381
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x7706
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x48
1906D
Spaceship Exploration
binary search
,
geometry
2800
x80
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x138
1886B
Fear of the Dark
binary search
,
geometry
,
math
1200
x14850
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x13930
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x399
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x260
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x10923
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x20183
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x18026
1845B
Come Together
geometry
,
implementation
,
math
900
x20599
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1502
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x461
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x333
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x3374
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x16832
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x3695
1806A
Walking Master
geometry
,
greedy
,
math
800
x21586
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x11847
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1124
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x20989
1791B
Following Directions
geometry
,
implementation
800
x41136
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x194
1781A
Parallel Projection
geometry
,
math
800
x14812
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x632
1776B
Vittorio Plays with LEGO Bricks
dp
,
geometry
2200
x1228
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x583
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
x98
1740B
Jumbo Extra Cheese 2
geometry
,
greedy
,
sortings
800
x13448
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2363
1735F
Pebbles and Beads
data structures
,
geometry
2900
x190
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x11616
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x78
1725G
Garage
binary search
,
geometry
,
math
1500
x5519
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1519
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x493
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1578
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x21571
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2333
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1123
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x262
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x3991
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x4913
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1357
1666G
Global Warming
geometry
,
math
3100
x131
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x3031
1662K
Pandemic Restrictions
geometry
,
ternary search
x294
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x11524
1642A
Hard Way
geometry
800
x15873
1641F
Covering Circle
geometry
3500
x92
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x81
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x548
1622A
Construct a Rectangle
geometry
,
math
800
x29287
1620B
Triangles on a Rectangle
geometry
,
greedy
,
math
1000
x19191
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x11879
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x353
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x8320
1584G
Eligible Segments
geometry
3200
x200
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1578F
Framing Pictures
geometry
2900
x148
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x231
1575B
Building an Amusement Park
binary search
,
geometry
2300
x447
1572E
Polygon
binary search
,
dp
,
geometry
3000
x263
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x44
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5745
1550C
Manhattan Subarrays
brute force
,
geometry
,
greedy
,
implementation
1700
x9864
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
x1420
1539A
Contest Start
combinatorics
,
geometry
,
greedy
,
math
1000
x19508
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x901
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x499
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x786
1517H
Fly Around the World
dp
,
geometry
3500
x63
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x23946
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x520
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x124
1495A
Diamond Miner
geometry
,
greedy
,
math
,
sortings
1200
x16562
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x15045
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x2184
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x468
1468G
Hobbits
binary search
,
geometry
2500
x790
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3535
1466A
Bovine Dilemma
brute force
,
geometry
,
math
800
x22230
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1418
1451D
Circle Game
games
,
geometry
,
math
1700
x9200
1450B
Balls of Steel
brute force
,
geometry
,
greedy
1000
x14805
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x263
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x529
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x66
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