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Educational Codeforces Round 165 (Rated for Div. 2)
32:39:26
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Difficulty:
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sortings
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
274D
Lovely Matrix
dfs and similar
,
graphs
,
greedy
,
sortings
2200
x1005
274A
k-Multiple Free Set
binary search
,
greedy
,
sortings
1500
x9834
272D
Dima and Two Sequences
combinatorics
,
math
,
sortings
1600
x2582
269D
Maximum Waterfall
data structures
,
dp
,
graphs
,
sortings
2600
x413
268E
Playlist
math
,
probabilities
,
sortings
2100
x972
263B
Squares
greedy
,
implementation
,
sortings
900
x8702
261A
Maxim and Discounts
greedy
,
sortings
1400
x5086
257A
Sockets
greedy
,
implementation
,
sortings
1100
x6375
254A
Cards with Numbers
constructive algorithms
,
sortings
1200
x6831
253E
Printer
binary search
,
data structures
,
implementation
,
sortings
2200
x520
253B
Physics Practical
binary search
,
dp
,
sortings
,
two pointers
1400
x10299
252B
Unsorting Array
brute force
,
sortings
1800
x1678
249D
Donkey and Stars
data structures
,
dp
,
geometry
,
math
,
sortings
2700
x374
246E
Blood Cousins Return
binary search
,
data structures
,
dfs and similar
,
dp
,
sortings
2400
x2947
246A
Buggy Sorting
constructive algorithms
,
greedy
,
sortings
900
x9033
243B
Hydra
graphs
,
sortings
2000
x1175
242B
Big Segment
implementation
,
sortings
1100
x15180
237B
Young Table
implementation
,
sortings
1500
x2218
234B
Reading
sortings
1000
x6968
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8281
230A
Dragons
greedy
,
sortings
1000
x74079
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2127
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2078
220A
Little Elephant and Problem
implementation
,
sortings
1300
x11789
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1319
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x276
203C
Photographer
greedy
,
sortings
1400
x5568
198E
Gripping Story
binary search
,
data structures
,
sortings
2400
x400
196C
Paint Tree
constructive algorithms
,
divide and conquer
,
geometry
,
sortings
,
trees
2200
x738
195D
Analyzing Polyline
geometry
,
math
,
sortings
1900
x998
190E
Counter Attack
data structures
,
dsu
,
graphs
,
hashing
,
sortings
2100
x1429
186B
Growing Mushrooms
greedy
,
sortings
1200
x5286
178F2
Representative Sampling
dp
,
sortings
,
strings
2200
x314
176A
Trading Business
greedy
,
sortings
1200
x1403
175C
Geometry Horse
greedy
,
implementation
,
sortings
,
two pointers
1600
x1288
173E
Camping Groups
data structures
,
sortings
2600
x534
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1129
169A
Chores
sortings
800
x6546
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x344
166C
Median
greedy
,
math
,
sortings
1500
x6337
166B
Polygons
geometry
,
sortings
2100
x2120
166A
Rank List
binary search
,
implementation
,
sortings
1100
x16726
163C
Conveyor
sortings
,
two pointers
2100
x536
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1922
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x576
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2349
160C
Find Pair
implementation
,
math
,
sortings
1700
x3380
160B
Unlucky Ticket
greedy
,
sortings
1100
x13554
160A
Twins
greedy
,
sortings
900
x110498
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x987
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3667
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1449
157B
Trace
geometry
,
sortings
1000
x12834
155B
Combination
greedy
,
sortings
1100
x10003
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2666
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5251
149A
Business trip
greedy
,
implementation
,
sortings
900
x37608
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2366
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x77649
140F
New Year Snowflake
geometry
,
sortings
2600
x359
140D
New Year Contest
greedy
,
sortings
1800
x2193
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x844
137C
History
sortings
1500
x7051
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7424
131E
Yet Another Task with Queens
sortings
1700
x1807
130I
Array sorting
*special problem
,
sortings
2300
x164
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x907
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1061
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2516
115B
Lawnmower
greedy
,
sortings
1500
x2421
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x615
108B
Datatypes
math
,
sortings
1400
x2410
105C
Item World
brute force
,
implementation
,
sortings
2200
x269
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x1980
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x671
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2894
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x845
85E
Guard Towers
binary search
,
dsu
,
geometry
,
graphs
,
sortings
2600
x904
85C
Petya and Tree
binary search
,
dfs and similar
,
probabilities
,
sortings
,
trees
2200
x521
83B
Doctor
binary search
,
math
,
sortings
1800
x1615
82C
General Mobilization
data structures
,
dfs and similar
,
sortings
2000
x798
81C
Average Score
greedy
,
math
,
sortings
1700
x1624
79B
Colorful Field
implementation
,
sortings
1400
x6776
76A
Gift
dsu
,
graphs
,
sortings
,
trees
2200
x1440
73B
Need For Brake
binary search
,
greedy
,
sortings
2000
x488
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x561
64I
Sort the Table
*special problem
,
sortings
2400
x84
64H
Table Bowling
*special problem
,
sortings
2300
x109
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x10840
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x247
56E
Domino Principle
binary search
,
data structures
,
sortings
2200
x2210
53D
Physical Education
sortings
1500
x1904
48F
Snow sellers
greedy
,
sortings
2800
x133
47E
Cannon
data structures
,
geometry
,
sortings
2200
x352
45D
Event Dates
greedy
,
meet-in-the-middle
,
sortings
1900
x1587
39C
Moon Craters
dp
,
sortings
2100
x568
38E
Let's Go Rolling!
dp
,
sortings
1800
x2481
37A
Towers
sortings
1000
x23523
35E
Parade
data structures
,
sortings
2100
x701
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4062
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