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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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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
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Name
37D
Lesson Timetable
combinatorics
,
dp
,
math
2300
x419
37C
Old Berland Language
data structures
,
greedy
,
trees
1900
x1735
37B
Computer Game
greedy
,
implementation
1800
x925
36E
Two Paths
constructive algorithms
,
dsu
,
graphs
,
implementation
2600
x534
36D
New Game with a Chess Piece
games
2300
x710
36C
Bowls
geometry
,
implementation
2200
x339
36B
Fractal
implementation
1600
x1515
35E
Parade
data structures
,
sortings
2100
x750
35D
Animals
dp
,
greedy
1700
x3365
35B
Warehouse
implementation
1700
x1022
34E
Collisions
brute force
,
implementation
,
math
2000
x591
34D
Road Map
dfs and similar
,
graphs
1600
x5221
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
x4604
32E
Hide-and-Seek
geometry
,
implementation
2400
x337
32D
Constellation
implementation
1600
x1289
32C
Flea
math
1700
x2176
31E
TV Game
dp
2400
x1100
31D
Chocolate
dfs and similar
,
implementation
2000
x1048
31C
Schedule
implementation
1700
x1827
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
x1973
30B
Codeforces World Finals
implementation
1700
x1204
29E
Quarrel
graphs
,
shortest paths
2400
x927
29D
Ant on the Tree
constructive algorithms
,
dfs and similar
,
trees
2000
x2482
29C
Mail Stamps
data structures
,
dfs and similar
,
graphs
,
implementation
1700
x5004
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
x1057
28B
pSort
dfs and similar
,
dsu
,
graphs
1600
x4710
28A
Bender Problem
implementation
1600
x801
27E
Number With The Given Amount Of Divisors
brute force
,
dp
,
number theory
2000
x4251
27D
Ring Road 2
2-sat
,
dfs and similar
,
dsu
,
graphs
2200
x2549
27C
Unordered Subsequence
constructive algorithms
,
greedy
1900
x2814
26E
Multithreading
constructive algorithms
2400
x376
26D
Tickets
combinatorics
,
math
,
probabilities
2400
x800
26C
Parquet
combinatorics
,
constructive algorithms
,
greedy
,
implementation
2000
x863
25E
Test
hashing
,
strings
2200
x2511
25D
Roads not only in Berland
dsu
,
graphs
,
trees
1900
x11558
25C
Roads in Berland
graphs
,
shortest paths
1900
x6390
24E
Berland collider
binary search
2300
x902
24D
Broken robot
dp
,
math
,
probabilities
2400
x1990
24C
Sequence of points
geometry
,
implementation
,
math
1800
x1263
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
22E
Scheme
dfs and similar
,
graphs
,
trees
2300
x1671
22D
Segments
greedy
,
sortings
1900
x2755
22C
System Administrator
graphs
1700
x3149
21D
Traveling Graph
bitmasks
,
graph matchings
,
graphs
2400
x908
21C
Stripe 2
binary search
,
dp
,
sortings
2000
x2153
21B
Intersection
implementation
,
math
2000
x1359
21A
Jabber ID
implementation
,
strings
1900
x1885
20C
Dijkstra?
graphs
,
shortest paths
1900
x33370
20B
Equation
math
2000
x3918
20A
BerOS file system
implementation
1700
x6246
19E
Fairy
dfs and similar
,
divide and conquer
,
dsu
2900
x1892
19D
Points
data structures
2800
x2460
19C
Deletion of Repeats
greedy
,
hashing
,
string suffix structures
2200
x1108
19B
Checkout Assistant
dp
1900
x4854
18E
Flag 2
dp
2000
x1090
18D
Seller Bob
brute force
,
dp
,
greedy
2000
x1077
18B
Platforms
brute force
,
math
1700
x2152
17E
Palisection
strings
2900
x1599
17D
Notepad
number theory
2400
x1098
17C
Balance
dp
2500
x933
16E
Fish
bitmasks
,
dp
,
probabilities
1900
x5198
16D
Logging
implementation
,
strings
1900
x1613
16C
Monitor
binary search
,
number theory
1800
x4796
15E
Triangles
combinatorics
,
dp
2600
x586
15D
Map
data structures
,
implementation
,
sortings
2500
x769
15C
Industrial Nim
games
2000
x2326
15B
Laser
math
1800
x1475
14E
Camels
dp
1900
x1716
14D
Two Paths
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
,
two pointers
1900
x4592
14C
Four Segments
brute force
,
constructive algorithms
,
geometry
,
implementation
,
math
1700
x3404
13E
Holes
data structures
,
dsu
2700
x6119
13D
Triangles
dp
,
geometry
2600
x666
13C
Sequence
dp
,
sortings
2200
x4697
13B
Letter A
geometry
,
implementation
2000
x1005
12E
Start of the session
constructive algorithms
2100
x1238
12D
Ball
data structures
,
sortings
2400
x2325
11E
Forward, march!
binary search
,
dp
,
greedy
2800
x368
11D
A Simple Task
bitmasks
,
dp
,
graphs
2200
x4960
11C
How Many Squares?
implementation
2200
x617
11B
Jumping Jack
math
1600
x4738
10E
Greedy Change
constructive algorithms
2600
x839
10D
LCIS
dp
2800
x4510
10C
Digital Root
number theory
2000
x1468
9E
Interestring graph and Apples
dfs and similar
,
dsu
,
graphs
2300
x1048
9D
How many trees?
combinatorics
,
divide and conquer
,
dp
1900
x3906
8E
Beads
dp
,
graphs
2600
x697
8D
Two Friends
binary search
,
geometry
2600
x528
8C
Looking for Order
bitmasks
,
dp
2000
x3603
7E
Defining Macros
dp
,
expression parsing
,
implementation
2600
x722
7D
Palindrome Degree
hashing
,
strings
2200
x3775
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