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Before contest
Codeforces Round (Div. 2)
5 days
→ Filter Problems
Difficulty:
—
geometry
combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
communication
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
2225E
Covering Points with Circles
constructive algorithms
,
geometry
,
math
x1130
2215E
Star Map
constructive algorithms
,
data structures
,
geometry
,
greedy
,
sortings
2700
x171
2211G
Rational Bubble Sort
constructive algorithms
,
geometry
,
greedy
2900
x286
2206E
Parallel Sums
data structures
,
geometry
2500
x406
2195H
Codeforces Heuristic Contest 001
brute force
,
constructive algorithms
,
geometry
,
implementation
2400
x471
2181I
Irrigation Interlock
geometry
3500
x50
2179E
Blackslex and Girls
constructive algorithms
,
geometry
,
math
1800
x5798
2172I
Birthday
geometry
2000
x1080
2167E
khba Loves to Sleep!
binary search
,
data structures
,
geometry
,
greedy
,
implementation
1600
x9096
2159D1
Inverse Minimum Partition (Easy Version)
binary search
,
brute force
,
dp
,
geometry
,
greedy
,
math
,
two pointers
2500
x1037
2153C
Symmetrical Polygons
constructive algorithms
,
geometry
,
greedy
,
implementation
,
sortings
1500
x11804
2148B
Lasers
geometry
800
x33089
2141G
Good Robot Paths
*special problem
,
data structures
,
geometry
,
sortings
2800
x62
2138F
Ode to the Bridge Builder
constructive algorithms
,
geometry
3500
x82
2122F
Colorful Polygon
constructive algorithms
,
divide and conquer
,
geometry
3400
x130
2122C
Manhattan Pairs
constructive algorithms
,
geometry
,
greedy
,
math
,
sortings
1700
x8503
2120B
Square Pool
geometry
1000
x17761
2120A
Square of Rectangles
geometry
,
math
800
x20342
2119B
Line Segments
geometry
,
greedy
,
math
1200
x18332
2118E
Grid Coloring
constructive algorithms
,
geometry
,
greedy
,
math
2400
x1429
2097C
Bermuda Triangle
chinese remainder theorem
,
geometry
,
implementation
,
math
,
number theory
2400
x1024
2095G
Definitely a Geometry Problem
*special problem
,
geometry
x961
2095D
Where Am I?
*special problem
,
geometry
x5303
2074G
Game With Triangles: Season 2
dp
,
geometry
2100
x2169
2074E
Empty Triangle
geometry
,
interactive
,
probabilities
1600
x6665
2074D
Counting Points
brute force
,
data structures
,
geometry
,
implementation
,
two pointers
1400
x12077
2074C
XOR and Triangle
bitmasks
,
brute force
,
geometry
,
greedy
,
probabilities
1100
x21986
2074B
The Third Side
geometry
,
greedy
,
math
800
x34785
2074A
Draw a Square
geometry
,
implementation
800
x44347
2072E
Do You Love Your Hero and His Two-Hit Multi-Target Attacks?
binary search
,
brute force
,
constructive algorithms
,
dp
,
geometry
,
greedy
,
math
1500
x12286
2063D
Game With Triangles
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
,
two pointers
2000
x5047
2062G
Permutation Factory
flows
,
geometry
,
graph matchings
,
graphs
3500
x176
2062F
Traveling Salescat
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
math
,
sortings
2900
x614
2061B
Kevin and Geometry
binary search
,
geometry
1100
x14699
2055F
Cosmic Divide
brute force
,
geometry
,
hashing
,
math
,
strings
3200
x90
2053A
Tender Carpenter
dp
,
geometry
,
greedy
,
math
800
x21268
2052G
Geometric Balance
data structures
,
geometry
,
implementation
2800
x208
2038C
DIY
data structures
,
geometry
,
greedy
,
sortings
1400
x6938
2027A
Rectangle Arrangement
geometry
,
implementation
,
math
800
x22028
2026A
Perpendicular Segments
constructive algorithms
,
geometry
,
greedy
,
math
900
x20278
2009D
Satyam and Counting
geometry
,
math
1400
x18798
2002C
Black Circles
brute force
,
geometry
,
greedy
,
math
1200
x17714
1986A
X Axis
brute force
,
geometry
,
math
,
sortings
800
x48017
1984H
Tower Capturing
combinatorics
,
dp
,
geometry
3300
x210
1979E
Manhattan Triangle
binary search
,
constructive algorithms
,
data structures
,
geometry
,
implementation
,
two pointers
2400
x1812
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x12486
1952I
Dark Matter
*special problem
,
bitmasks
,
geometry
x650
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x2759
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x203
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x6877
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x12430
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x30
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x171
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x8079
1928A
Rectangle Cutting
geometry
,
math
800
x24425
1926B
Vlad and Shapes
geometry
,
implementation
800
x36469
1924C
Fractal Origami
geometry
,
math
,
matrices
2400
x1378
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x642
1916D
Mathematical Problem
brute force
,
constructive algorithms
,
geometry
,
math
1700
x9779
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x66
1906D
Spaceship Exploration
binary search
,
geometry
2800
x169
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x188
1886B
Fear of the Dark
binary search
,
geometry
,
math
1200
x18034
1869B
2D Traveling
geometry
,
math
,
shortest paths
,
sortings
1100
x25795
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x559
1860F
Evaluate RBS
data structures
,
geometry
,
implementation
,
math
,
sortings
2900
x322
1850G
The Morning Star
combinatorics
,
data structures
,
geometry
,
implementation
,
math
,
sortings
1500
x15492
1850E
Cardboard for Pictures
binary search
,
geometry
,
implementation
,
math
1100
x35084
1846D
Rudolph and Christmas Tree
constructive algorithms
,
geometry
,
math
1200
x22461
1845B
Come Together
geometry
,
implementation
,
math
900
x23725
1842E
Tenzing and Triangle
data structures
,
dp
,
geometry
,
greedy
,
math
2300
x1832
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x608
1826F
Fading into Fog
geometry
,
interactive
,
math
,
probabilities
2800
x459
1819B
The Butcher
geometry
,
greedy
,
implementation
,
sortings
,
two pointers
1900
x4224
1816A
Ian Visits Mary
constructive algorithms
,
geometry
,
number theory
800
x18867
1812E
Not a Geometry Problem
*special problem
,
*special problem
,
constructive algorithms
,
geometry
,
math
x4304
1806A
Walking Master
geometry
,
greedy
,
math
800
x43610
1805C
Place for a Selfie
binary search
,
data structures
,
geometry
,
math
1400
x14185
1799E
City Union
constructive algorithms
,
dfs and similar
,
dsu
,
geometry
,
greedy
,
implementation
,
math
2300
x1403
1795B
Ideal Point
brute force
,
geometry
,
greedy
900
x24102
1791B
Following Directions
geometry
,
implementation
800
x52701
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x337
1781A
Parallel Projection
geometry
,
math
800
x16092
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x895
1776B
Vittorio Plays with LEGO Bricks
dp
,
geometry
2200
x1555
1765F
Chemistry Lab
dp
,
geometry
,
probabilities
2200
x761
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x112
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x152
1740B
Jumbo Extra Cheese 2
geometry
,
greedy
,
sortings
800
x14353
1736D
Equal Binary Subsequences
constructive algorithms
,
geometry
,
greedy
,
implementation
,
strings
2200
x2780
1735F
Pebbles and Beads
data structures
,
geometry
2900
x254
1730B
Meeting on the Line
binary search
,
geometry
,
greedy
,
implementation
,
math
,
ternary search
1600
x17293
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x106
1725G
Garage
binary search
,
geometry
,
math
1500
x6700
1725C
Circular Mirror
binary search
,
combinatorics
,
geometry
,
math
,
two pointers
2000
x1947
1715F
Crop Squares
constructive algorithms
,
geometry
,
interactive
,
math
2700
x589
1715E
Long Way Home
data structures
,
divide and conquer
,
dp
,
geometry
,
graphs
,
greedy
,
shortest paths
2400
x2137
1713A
Traveling Salesman Problem
geometry
,
greedy
,
implementation
800
x22825
1710B
Rain
binary search
,
brute force
,
data structures
,
geometry
,
greedy
,
implementation
,
math
2100
x2796
1697E
Coloring
brute force
,
combinatorics
,
constructive algorithms
,
dp
,
geometry
,
graphs
,
greedy
,
implementation
,
math
2400
x1450
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