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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
27:20:03
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→ Filter Problems
Difficulty:
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brute force
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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Status
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Custom test
Problems
#
Name
177C2
Party
brute force
,
dfs and similar
,
dsu
,
graphs
1500
x2581
175E
Power Defence
brute force
,
dp
,
geometry
,
greedy
2600
x266
175D
Plane of Tanks: Duel
brute force
,
dp
,
math
,
probabilities
2400
x297
175A
Robot Bicorn Attack
brute force
,
implementation
1400
x2402
173C
Spiral Maximum
brute force
,
dp
1900
x989
172A
Phone Code
*special problem
,
brute force
,
implementation
800
x6168
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1284
171D
Broken checker
*special problem
,
brute force
1300
x2580
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6990
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12364
164D
Minimum Diameter
binary search
,
brute force
3100
x244
163D
Large Refrigerator
brute force
2900
x507
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x469
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4923
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4324
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x3001
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6253
157A
Game Outcome
brute force
800
x7660
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x163
156A
Message
brute force
1700
x3046
155A
I_love_\%username\%
brute force
800
x76608
152D
Frames
brute force
2600
x244
146B
Lucky Mask
brute force
,
implementation
1300
x4410
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13947
142C
Help Caretaker
brute force
,
dp
2300
x930
142A
Help Farmer
brute force
,
math
1600
x2630
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1683
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x174
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x301
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2361
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2051
134A
Average Numbers
brute force
,
implementation
1200
x4002
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12361
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2599
126E
Pills
brute force
,
flows
2900
x83
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1437
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3949
122B
Lucky Substring
brute force
,
implementation
1000
x12390
122A
Lucky Division
brute force
,
number theory
1000
x125299
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1288
120D
Three Sons
brute force
1400
x1936
120A
Elevator
brute force
,
implementation
,
math
1000
x4840
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2603
117B
Very Interesting Game
brute force
,
number theory
1800
x1614
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3717
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1240
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2834
109E
Lucky Interval
brute force
,
math
2700
x102
109B
Lucky Probability
brute force
,
probabilities
1900
x1556
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x17759
106D
Treasure Island
brute force
,
implementation
1700
x1364
106B
Choosing Laptop
brute force
,
implementation
1000
x6127
105E
Lift and Throw
brute force
2500
x192
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x139
105C
Item World
brute force
,
implementation
,
sortings
2200
x344
105B
Dark Assembly
brute force
,
probabilities
1800
x819
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x2131
102A
Clothes
brute force
1200
x3029
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1216
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x248
97A
Domino
brute force
,
implementation
2400
x266
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x15682
93C
Azembler
brute force
,
implementation
2500
x424
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x624
88A
Chord
brute force
,
implementation
1200
x3837
86E
Long sequence
brute force
,
math
,
matrices
2700
x189
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x2058
80A
Panoramix's Prediction
brute force
800
x54491
77A
Heroes
brute force
,
implementation
1400
x1781
73F
Plane of Tanks
brute force
,
geometry
2900
x81
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x173
71D
Solitaire
brute force
,
implementation
2200
x657
68C
Synchrophasotron
brute force
2200
x311
66B
Petya and Countryside
brute force
,
implementation
1100
x20682
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x433
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1378
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x243
63C
Bulls and Cows
brute force
,
implementation
1700
x1737
60D
Savior
brute force
,
dsu
,
math
2500
x452
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x567
58C
Trees
brute force
1800
x2042
55B
Smallest number
brute force
1600
x2876
54D
Writing a Song
brute force
,
dp
,
strings
2100
x547
49D
Game
brute force
,
dp
,
implementation
1800
x1919
48B
Land Lot
brute force
,
implementation
1200
x2700
47D
Safe
brute force
2200
x780
47A
Triangular numbers
brute force
,
math
800
x15205
46A
Ball Game
brute force
,
implementation
800
x8794
44I
Toys
brute force
,
combinatorics
2300
x195
43E
Race
brute force
,
implementation
,
two pointers
2300
x396
43D
Journey
brute force
,
constructive algorithms
,
implementation
2000
x1091
42C
Safe cracking
brute force
,
constructive algorithms
2200
x488
41B
Martian Dollar
brute force
1400
x4056
38C
Blinds
brute force
1400
x2186
38B
Chess
brute force
,
implementation
,
math
1200
x3547
35C
Fire Again
brute force
,
dfs and similar
,
shortest paths
1500
x6930
34E
Collisions
brute force
,
implementation
,
math
2000
x591
32A
Reconnaissance
brute force
800
x12647
30A
Accounting
brute force
,
math
1400
x3482
29A
Spit Problem
brute force
1000
x7126
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