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Codeforces Round 946 (Div. 3)
25:37:18
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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
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x4572
29B
Traffic Lights
implementation
1500
x2837
29A
Spit Problem
brute force
1000
x6846
28E
DravDe saves the world
geometry
,
math
2800
x85
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x589
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x985
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4422
28A
Bender Problem
implementation
1600
x769
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4001
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2368
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2696
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5155
27A
Next Test
implementation
,
sortings
1200
x19381
26E
Multithreading
constructive algorithms
2400
x362
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x758
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x824
26B
Regular Bracket Sequence
greedy
1400
x17584
26A
Almost Prime
number theory
900
x28745
25E
Test
hashing
,
strings
2200
x2202
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x10415
25C
Roads in Berland
graphs
,
shortest paths
1900
x5894
25B
Phone numbers
implementation
1100
x9340
25A
IQ test
brute force
1300
x81508
24E
Berland collider
binary search
2300
x859
24D
Broken robot
dp
,
math
,
probabilities
2400
x1804
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1215
24B
F1 Champions
implementation
1500
x1715
24A
Ring road
graphs
1400
x4786
23E
Tree
dp
2500
x589
23D
Tetragon
geometry
,
math
2600
x325
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1357
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3201
23A
You're Given a String...
brute force
,
greedy
1200
x5086
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1550
22D
Segments
greedy
,
sortings
1900
x2622
22C
System Administrator
graphs
1700
x2957
22B
Bargaining Table
brute force
,
dp
1500
x4082
22A
Second Order Statistics
brute force
800
x20963
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x796
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2023
21B
Intersection
implementation
,
math
2000
x1303
21A
Jabber ID
implementation
,
strings
1900
x1784
20C
Dijkstra?
graphs
,
shortest paths
1900
x30040
20B
Equation
math
2000
x3661
20A
BerOS file system
implementation
1700
x5955
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1620
19D
Points
data structures
2800
x2124
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1048
19B
Checkout Assistant
dp
1900
x4443
19A
World Football Cup
implementation
1400
x2629
18E
Flag 2
dp
2000
x1022
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1032
18C
Stripe
data structures
,
implementation
1200
x12509
18B
Platforms
brute force
,
math
1700
x2064
18A
Triangle
brute force
,
geometry
1500
x5706
17E
Palisection
strings
2900
x1513
17D
Notepad
number theory
2400
x1038
17C
Balance
dp
2500
x818
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4486
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x15150
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x4666
16D
Logging
implementation
,
strings
1900
x1512
16C
Monitor
binary search
,
number theory
1800
x4520
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x16942
16A
Flag
implementation
800
x13614
15E
Triangles
combinatorics
,
dp
2600
x557
15D
Map
data structures
,
implementation
,
sortings
2500
x717
15C
Industrial Nim
games
2000
x2164
15B
Laser
math
1800
x1298
15A
Cottage Village
implementation
,
sortings
1200
x3615
14E
Camels
dp
1900
x1620
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4319
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3096
14B
Young Photographer
implementation
1000
x6677
14A
Letter
implementation
800
x10075
13E
Holes
data structures
,
dsu
2700
x5391
13D
Triangles
dp
,
geometry
2600
x595
13C
Sequence
dp
,
sortings
2200
x4136
13B
Letter A
geometry
,
implementation
2000
x834
13A
Numbers
implementation
,
math
1000
x7376
12E
Start of the session
constructive algorithms
2100
x1163
12D
Ball
data structures
,
sortings
2400
x2007
12C
Fruits
greedy
,
implementation
,
sortings
1100
x5788
12B
Correct Solution?
implementation
,
sortings
1100
x8070
12A
Super Agent
implementation
800
x12412
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x346
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4477
11C
How Many Squares?
implementation
2200
x590
11B
Jumping Jack
math
1600
x4341
11A
Increasing Sequence
constructive algorithms
,
implementation
,
math
900
x12451
10E
Greedy Change
constructive algorithms
2600
x803
10D
LCIS
dp
2800
x4065
10C
Digital Root
number theory
2000
x1393
10B
Cinema Cashier
dp
,
implementation
1500
x1721
10A
Power Consumption Calculation
implementation
900
x6689
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x989
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3675
9C
Hexadecimal's Numbers
brute force
,
implementation
,
math
1200
x12396
9B
Running Student
brute force
,
geometry
,
implementation
1200
x5207
9A
Die Roll
math
,
probabilities
800
x52796
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