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Codeforces Round #851 (Div. 2)
37:47:58
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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
1791B
Following Directions
geometry
,
implementation
800
x26005
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x96
1781A
Parallel Projection
geometry
,
math
800
x13022
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x404
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x68
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x53
1740B
Jumbo Extra Cheese 2
geometry
,
greedy
,
sortings
800
x12429
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x1992
1735F
Pebbles and Beads
data structures
,
geometry
2900
x158
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x9153
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x55
1725G
Garage
binary search
,
geometry
,
math
1500
x4069
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1092
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x426
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x1203
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x20158
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x1991
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x990
1696G
Fishingprince Plays With Array Again
brute force
,
data structures
,
geometry
,
math
3300
x184
1689D
Lena and Matrix
data structures
,
dp
,
geometry
,
shortest paths
1900
x3409
1670D
Very Suspicious
binary search
,
brute force
,
geometry
,
greedy
,
implementation
,
math
1700
x4206
1666I
Interactive Treasure Hunt
brute force
,
constructive algorithms
,
geometry
,
interactive
,
math
2200
x1168
1666G
Global Warming
geometry
,
math
3100
x107
1666C
Connect the Points
brute force
,
constructive algorithms
,
geometry
1800
x2567
1662K
Pandemic Restrictions
geometry
,
ternary search
x213
1648A
Weird Sum
combinatorics
,
data structures
,
geometry
,
math
,
matrices
,
sortings
1400
x9967
1642A
Hard Way
geometry
800
x14984
1641F
Covering Circle
geometry
3500
x64
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x66
1627F
Not Splitting
geometry
,
graphs
,
greedy
,
implementation
,
shortest paths
2700
x470
1622A
Construct a Rectangle
geometry
,
math
800
x26436
1620B
Triangles on a Rectangle
geometry
,
greedy
,
math
1000
x16911
1616C
Representative Edges
brute force
,
geometry
,
implementation
,
math
1500
x10638
1599G
Shortest path
brute force
,
geometry
,
math
,
shortest paths
2700
x310
1598D
Training Session
combinatorics
,
data structures
,
geometry
,
implementation
,
math
1700
x7324
1584G
Eligible Segments
geometry
3200
x163
1578I
Interactive Rays
geometry
,
interactive
3300
x44
1578F
Framing Pictures
geometry
2900
x139
1575M
Managing Telephone Poles
data structures
,
geometry
2400
x185
1575B
Building an Amusement Park
binary search
,
geometry
2300
x381
1572E
Polygon
binary search
,
dp
,
geometry
3000
x206
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x30
1552C
Maximize the Intersections
combinatorics
,
constructive algorithms
,
geometry
,
greedy
,
sortings
1800
x5358
1550C
Manhattan Subarrays
brute force
,
geometry
,
greedy
,
implementation
1700
x8920
1548D2
Gregor and the Odd Cows (Hard)
brute force
,
geometry
,
math
,
number theory
3300
x211
1548D1
Gregor and the Odd Cows (Easy)
bitmasks
,
geometry
,
math
,
number theory
2300
x1300
1539A
Contest Start
combinatorics
,
geometry
,
greedy
,
math
1000
x18008
1536F
Omkar and Akmar
chinese remainder theorem
,
combinatorics
,
constructive algorithms
,
fft
,
games
,
geometry
,
math
,
meet-in-the-middle
,
string suffix structures
2600
x812
1534G
A New Beginning
data structures
,
dp
,
geometry
,
sortings
3300
x309
1519E
Off by One
constructive algorithms
,
dfs and similar
,
geometry
,
graphs
,
sortings
,
trees
2700
x709
1517H
Fly Around the World
dp
,
geometry
3500
x48
1515B
Phoenix and Puzzle
brute force
,
geometry
,
math
,
number theory
1000
x21147
1508D
Swap Pass
constructive algorithms
,
geometry
,
sortings
3000
x371
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x98
1495A
Diamond Miner
geometry
,
greedy
,
math
,
sortings
1200
x15397
1486B
Eastern Exhibition
binary search
,
geometry
,
shortest paths
,
sortings
1500
x13666
1477C
Nezzar and Nice Beatmap
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
2200
x1991
1468I
Plane Tiling
geometry
,
implementation
,
math
2500
x424
1468G
Hobbits
binary search
,
geometry
2500
x704
1468F
Full Turn
geometry
,
hashing
,
number theory
1700
x3190
1466A
Bovine Dilemma
brute force
,
geometry
,
math
800
x21500
1455E
Four Points
brute force
,
constructive algorithms
,
flows
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
2400
x1311
1451D
Circle Game
games
,
geometry
,
math
1700
x8549
1450B
Balls of Steel
brute force
,
geometry
,
greedy
1000
x14089
1446F
Line Distance
binary search
,
data structures
,
geometry
3200
x178
1444D
Rectangular Polyline
constructive algorithms
,
dp
,
geometry
2900
x400
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x48
1423E
5G Antenna Towers
geometry
2700
x57
1422A
Fence
geometry
,
math
800
x19809
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x92
1401E
Divide Square
data structures
,
geometry
,
implementation
,
sortings
2400
x1946
1398A
Bad Triangle
geometry
,
math
800
x25326
1394C
Boboniu and String
binary search
,
geometry
,
ternary search
2600
x756
1388E
Uncle Bogdan and Projections
data structures
,
geometry
,
sortings
2700
x350
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x103
1381E
Origami
geometry
,
math
,
sortings
3300
x87
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x63
1369A
FashionabLee
geometry
,
math
800
x32452
1368G
Shifting Dominoes
data structures
,
geometry
,
graphs
,
trees
3200
x251
1366F
Jog Around The Graph
binary search
,
dp
,
geometry
,
graphs
2700
x531
1359F
RC Kaboom Show
binary search
,
brute force
,
data structures
,
geometry
,
math
2900
x326
1354C2
Not So Simple Polygon Embedding
binary search
,
brute force
,
geometry
,
math
2000
x5442
1354C1
Simple Polygon Embedding
binary search
,
geometry
,
math
,
ternary search
1400
x14384
1331E
Jordan Smiley
*special problem
,
dfs and similar
,
geometry
,
implementation
x1148
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x54
1312A
Two Regular Polygons
geometry
,
greedy
,
math
,
number theory
800
x23439
1307B
Cow and Friend
geometry
,
greedy
,
math
1300
x12168
1303G
Sum of Prefix Sums
data structures
,
divide and conquer
,
geometry
,
trees
2700
x551
1299C
Water Balance
data structures
,
geometry
,
greedy
2100
x3213
1299B
Aerodynamic
geometry
1800
x4755
1292B
Aroma's Search
brute force
,
constructive algorithms
,
geometry
,
greedy
,
implementation
1700
x5482
1284E
New Year and Castle Construction
combinatorics
,
geometry
,
math
,
sortings
2500
x947
1271C
Shawarma Tent
brute force
,
geometry
,
greedy
,
implementation
1300
x9588
1270E
Divide Points
constructive algorithms
,
geometry
,
math
2300
x1970
1254C
Point Ordering
constructive algorithms
,
geometry
,
interactive
,
math
2300
x1127
1248A
Integer Points
geometry
,
math
1000
x12888
1237C1
Balanced Removals (Easier)
constructive algorithms
,
geometry
,
greedy
1700
x5571
1220G
Geolocation
geometry
3400
x33
1218B
Guarding warehouses
data structures
,
geometry
3000
x56
1216C
White Sheet
geometry
,
math
1700
x7534
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