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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
32:41:13
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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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Custom test
Problems
#
Name
34D
Road Map
dfs and similar
,
graphs
1600
x5225
34C
Page Numbers
expression parsing
,
implementation
,
sortings
,
strings
1300
x4253
34B
Sale
greedy
,
sortings
900
x53204
34A
Reconnaissance 2
implementation
800
x30112
33E
Helper
2600
x131
33D
Knights
geometry
,
graphs
,
shortest paths
,
sortings
2000
x1216
33C
Wonderful Randomized Sum
greedy
1800
x3028
33B
String Problem
shortest paths
1800
x4605
33A
What is for dinner?
greedy
,
implementation
1200
x4122
32E
Hide-and-Seek
geometry
,
implementation
2400
x337
32D
Constellation
implementation
1600
x1289
32C
Flea
math
1700
x2176
32B
Borze
expression parsing
,
implementation
800
x64748
32A
Reconnaissance
brute force
800
x12646
31E
TV Game
dp
2400
x1104
31D
Chocolate
dfs and similar
,
implementation
2000
x1048
31C
Schedule
implementation
1700
x1827
31B
Sysadmin Bob
greedy
,
implementation
,
strings
1500
x4347
31A
Worms Evolution
implementation
1200
x10408
30E
Tricky and Clever Password
binary search
,
constructive algorithms
,
data structures
,
greedy
,
hashing
,
strings
2800
x744
30D
King's Problem?
geometry
,
greedy
2600
x453
30C
Shooting Gallery
dp
,
probabilities
1800
x1975
30B
Codeforces World Finals
implementation
1700
x1205
30A
Accounting
brute force
,
math
1400
x3482
29E
Quarrel
graphs
,
shortest paths
2400
x928
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2482
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x5007
29B
Traffic Lights
implementation
1500
x2995
29A
Spit Problem
brute force
1000
x7126
28E
DravDe saves the world
geometry
,
math
2800
x91
28D
Don't fear, DravDe is kind
binary search
,
data structures
,
dp
,
hashing
2400
x617
28C
Bath Queue
combinatorics
,
dp
,
probabilities
2200
x1058
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4720
28A
Bender Problem
implementation
1600
x801
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4253
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2550
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2814
27B
Tournament
bitmasks
,
brute force
,
dfs and similar
,
greedy
1300
x5384
27A
Next Test
implementation
,
sortings
1200
x20489
26E
Multithreading
constructive algorithms
2400
x376
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x801
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x863
26B
Regular Bracket Sequence
greedy
1400
x19768
26A
Almost Prime
number theory
900
x31961
25E
Test
hashing
,
strings
2200
x2512
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x11568
25C
Roads in Berland
graphs
,
shortest paths
1900
x6396
25B
Phone numbers
implementation
1100
x9743
25A
IQ test
brute force
1300
x87329
24E
Berland collider
binary search
2300
x902
24D
Broken robot
dp
,
math
,
probabilities
2400
x1993
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1264
24B
F1 Champions
implementation
1500
x1787
24A
Ring road
graphs
1400
x5243
23E
Tree
dp
2500
x620
23D
Tetragon
geometry
,
math
2600
x337
23C
Oranges and Apples
constructive algorithms
,
sortings
2500
x1430
23B
Party
constructive algorithms
,
graphs
,
math
1600
x3378
23A
You're Given a String...
brute force
,
greedy
1200
x5371
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1672
22D
Segments
greedy
,
sortings
1900
x2756
22C
System Administrator
graphs
1700
x3149
22B
Bargaining Table
brute force
,
dp
1500
x4250
22A
Second Order Statistics
brute force
800
x22582
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x908
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2154
21B
Intersection
implementation
,
math
2000
x1359
21A
Jabber ID
implementation
,
strings
1900
x1885
20C
Dijkstra?
graphs
,
shortest paths
1900
x33393
20B
Equation
math
2000
x3925
20A
BerOS file system
implementation
1700
x6265
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1895
19D
Points
data structures
2800
x2465
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1108
19B
Checkout Assistant
dp
1900
x4863
19A
World Football Cup
implementation
1400
x2771
18E
Flag 2
dp
2000
x1090
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1077
18C
Stripe
data structures
,
implementation
1200
x13308
18B
Platforms
brute force
,
math
1700
x2152
18A
Triangle
brute force
,
geometry
1500
x6101
17E
Palisection
strings
2900
x1600
17D
Notepad
number theory
2400
x1098
17C
Balance
dp
2500
x934
17B
Hierarchy
dfs and similar
,
dsu
,
greedy
,
shortest paths
1500
x4911
17A
Noldbach problem
brute force
,
math
,
number theory
1000
x16796
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x5204
16D
Logging
implementation
,
strings
1900
x1614
16C
Monitor
binary search
,
number theory
1800
x4798
16B
Burglar and Matches
greedy
,
implementation
,
sortings
900
x18193
16A
Flag
implementation
800
x14492
15E
Triangles
combinatorics
,
dp
2600
x588
15D
Map
data structures
,
implementation
,
sortings
2500
x770
15C
Industrial Nim
games
2000
x2331
15B
Laser
math
1800
x1476
15A
Cottage Village
implementation
,
sortings
1200
x3934
14E
Camels
dp
1900
x1717
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4600
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3405
14B
Young Photographer
implementation
1000
x7122
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