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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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Status
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Custom test
Problems
#
Name
234H
Merging Two Decks
constructive algorithms
,
greedy
2000
x568
234G
Practice
constructive algorithms
,
divide and conquer
,
implementation
1600
x1480
234F
Fence
dp
1800
x1749
234E
Champions' League
implementation
1600
x1002
234D
Cinema
implementation
1600
x1540
232E
Quick Tortoise
bitmasks
,
divide and conquer
,
dp
3000
x697
232D
Fence
binary search
,
data structures
,
string suffix structures
2900
x475
232C
Doe Graphs
constructive algorithms
,
divide and conquer
,
dp
,
graphs
,
shortest paths
2600
x291
232B
Table
bitmasks
,
combinatorics
,
dp
,
math
1900
x1476
232A
Cycles
binary search
,
constructive algorithms
,
graphs
,
greedy
1600
x2547
231E
Cactus
data structures
,
dfs and similar
,
dp
,
graphs
,
trees
2100
x1899
231D
Magic Box
brute force
,
geometry
1600
x4106
231C
To Add or Not to Add
binary search
,
sortings
,
two pointers
1600
x8683
229E
Gifts
combinatorics
,
dp
,
math
,
probabilities
2600
x464
229D
Towers
dp
,
greedy
,
two pointers
2100
x2269
229C
Triangles
combinatorics
,
graphs
,
math
1900
x1626
229B
Planets
binary search
,
data structures
,
graphs
,
shortest paths
1700
x4708
228E
The Road to Berland is Paved With Good Intentions
2-sat
,
dfs and similar
,
dsu
,
graphs
1900
x2477
228D
Zigzag
data structures
2100
x386
228C
Fractal Detector
dp
,
hashing
2000
x455
226E
Noble Knight's Path
data structures
,
trees
2900
x462
226D
The table
constructive algorithms
,
greedy
2100
x967
226C
Anniversary
data structures
,
implementation
,
math
,
matrices
,
number theory
2400
x914
226B
Naughty Stone Piles
greedy
1900
x1566
225E
Unsolvable
math
,
number theory
2100
x806
225D
Snake
bitmasks
,
dfs and similar
,
graphs
,
implementation
2200
x949
225C
Barcode
dp
,
matrices
1700
x9213
225B
Well-known Numbers
binary search
,
greedy
,
number theory
1600
x3163
223E
Planar Graph
flows
,
geometry
,
graphs
3000
x191
223D
Spider
geometry
,
graphs
3000
x70
223C
Partial Sums
combinatorics
,
math
,
number theory
1900
x1567
223B
Two Strings
data structures
,
dp
,
strings
1900
x1813
223A
Bracket Sequence
data structures
,
expression parsing
,
implementation
1700
x2540
222E
Decoding Genome
dp
,
matrices
1900
x2824
222D
Olympiad
binary search
,
greedy
,
sortings
,
two pointers
1900
x2173
222C
Reducing Fractions
implementation
,
math
,
number theory
,
sortings
1800
x2262
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1412
220D
Little Elephant and Triangle
geometry
,
math
2500
x283
220C
Little Elephant and Shifts
data structures
2100
x945
220B
Little Elephant and Array
constructive algorithms
,
data structures
1800
x10403
219E
Parking Lot
data structures
2200
x620
219D
Choosing Capital for Treeland
dfs and similar
,
dp
,
graphs
,
trees
1700
x9638
219C
Color Stripe
brute force
,
dp
,
greedy
1600
x6677
217E
Alien DNA
data structures
,
dsu
,
trees
2800
x325
217D
Bitonix' Patrol
bitmasks
,
brute force
,
combinatorics
,
dfs and similar
,
math
2900
x251
217C
Formurosa
divide and conquer
,
dp
,
expression parsing
2600
x338
217B
Blackboard Fibonacci
brute force
,
math
2100
x899
216E
Martian Luck
math
,
number theory
2000
x590
216D
Spider's Web
binary search
,
sortings
,
two pointers
1700
x1358
216C
Hiring Staff
greedy
1800
x1853
216B
Forming Teams
dfs and similar
,
implementation
1700
x6403
215E
Periodical Numbers
combinatorics
,
dp
,
number theory
2100
x556
215D
Hot Days
greedy
1900
x1604
215C
Crosses
brute force
,
implementation
2100
x668
214B
Hometask
brute force
,
constructive algorithms
,
greedy
,
math
1600
x4984
213E
Two Permutations
data structures
,
hashing
,
strings
2700
x834
213D
Stars
constructive algorithms
,
geometry
2300
x341
213C
Relay Race
dp
2000
x2889
213B
Numbers
combinatorics
,
dp
1900
x1784
213A
Game
dfs and similar
,
greedy
1700
x1726
212D
Cutting a Fence
binary search
,
data structures
,
dsu
2500
x518
212C
Cowboys
combinatorics
,
dp
,
math
2100
x389
212B
Polycarpus is Looking for Good Substrings
bitmasks
,
hashing
,
implementation
2300
x335
212A
Privatization
flows
,
graphs
3000
x206
209C
Trails and Glades
constructive algorithms
,
dsu
,
graphs
,
greedy
2400
x754
209B
Pixels
constructive algorithms
,
math
2100
x377
209A
Multicolored Marbles
dp
,
math
1600
x2373
208E
Blood Cousins
binary search
,
data structures
,
dfs and similar
,
trees
2100
x6916
208C
Police Station
dp
,
graphs
,
shortest paths
1900
x1873
208B
Solitaire
dfs and similar
,
dp
1900
x1364
207D9
The Beaver's Problem - 3
1800
x88
207D8
The Beaver's Problem - 3
2300
x95
207D7
The Beaver's Problem - 3
1600
x101
207D6
The Beaver's Problem - 3
2100
x84
207D5
The Beaver's Problem - 3
1600
x142
207D4
The Beaver's Problem - 3
2100
x154
207D3
The Beaver's Problem - 3
2000
x136
207D2
The Beaver's Problem - 3
2000
x110
207D10
The Beaver's Problem - 3
2100
x82
207D1
The Beaver's Problem - 3
1800
x117
207C3
Game with Two Trees
data structures
2700
x134
207C2
Game with Two Trees
2200
x90
207C1
Game with Two Trees
2100
x107
207B3
Military Trainings
1700
x165
207B2
Military Trainings
1900
x189
207B1
Military Trainings
1600
x273
207A3
Beaver's Calculator 1.0
greedy
2000
x217
207A2
Beaver's Calculator 1.0
greedy
1800
x243
207A1
Beaver's Calculator 1.0
greedy
1600
x296
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1171
204D
Little Elephant and Retro Strings
dp
2400
x584
204C
Little Elephant and Furik and Rubik
math
,
probabilities
2000
x1119
203E
Transportation
greedy
,
sortings
,
two pointers
2300
x281
203D
Hit Ball
geometry
,
implementation
,
math
1700
x1418
202B
Brand New Easy Problem
brute force
1700
x818
201E
Thoroughly Bureaucratic Organization
binary search
,
combinatorics
2600
x427
201D
Brand New Problem
bitmasks
,
brute force
,
dp
2600
x418
201C
Fragile Bridges
dp
2000
x1367
201B
Guess That Car!
math
,
ternary search
1800
x1290
201A
Clear Symmetry
constructive algorithms
,
dp
,
math
1700
x3012
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