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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
15:08:34
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Difficulty:
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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
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Custom test
Problems
#
Name
162A
Pentagonal numbers
*special problem
,
implementation
1100
x805
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x469
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x15150
161C
Abracadabra
divide and conquer
2400
x653
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1960
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4923
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x592
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2792
160C
Find Pair
implementation
,
math
,
sortings
1700
x3458
160B
Unlucky Ticket
greedy
,
sortings
1100
x14133
160A
Twins
greedy
,
sortings
900
x119412
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x1001
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
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3809
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2485
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1463
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6253
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9267
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x87883
158A
Next Round
*special problem
,
implementation
800
x253813
157B
Trace
geometry
,
sortings
1000
x13252
157A
Game Outcome
brute force
800
x7682
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x163
156D
Clues
combinatorics
,
graphs
2500
x1596
156C
Cipher
combinatorics
,
dp
2000
x2429
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2234
156A
Message
brute force
1700
x3046
155B
Combination
greedy
,
sortings
1100
x10340
155A
I_love_\%username\%
brute force
800
x76620
154E
Martian Colony
geometry
3000
x97
154D
Flatland Fencing
games
,
math
2400
x433
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2873
154B
Colliders
math
,
number theory
1600
x4762
154A
Hometask
greedy
1600
x4065
153E
Euclidean Distance
*special problem
2100
x80
153D
Date Change
*special problem
2000
x83
153C
Caesar Cipher
*special problem
2200
x391
153B
Binary notation
*special problem
1800
x157
153A
A + B
*special problem
1600
x822
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x487
152D
Frames
brute force
2600
x244
152C
Pocket Book
combinatorics
1400
x10673
152B
Steps
binary search
,
implementation
1300
x6753
152A
Marks
implementation
900
x16880
151B
Phone Numbers
implementation
,
strings
1200
x6390
151A
Soft Drinking
implementation
,
math
800
x74710
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x868
150D
Mission Impassable
dp
,
strings
2600
x627
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x643
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4214
150A
Win or Freeze
games
,
math
,
number theory
1400
x7867
149E
Martian Strings
string suffix structures
,
strings
2300
x2293
149D
Coloring Brackets
dp
1900
x3914
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5405
149B
Martian Clock
implementation
1600
x2264
149A
Business trip
greedy
,
implementation
,
sortings
900
x40138
148E
Porcelain
dp
1900
x4088
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7345
148C
Terse princess
constructive algorithms
,
greedy
1700
x3147
148B
Escape
implementation
,
math
1500
x5513
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x93945
147B
Smile House
binary search
,
graphs
,
matrices
2500
x789
147A
Punctuation
implementation
,
strings
1300
x3658
146B
Lucky Mask
brute force
,
implementation
1300
x4410
146A
Lucky Ticket
implementation
800
x15177
145E
Lucky Queries
data structures
2400
x3201
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x243
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1911
145B
Lucky Number 2
constructive algorithms
1800
x2221
145A
Lucky Conversion
greedy
,
implementation
1200
x7174
144E
Competition
data structures
,
greedy
2200
x590
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4026
144C
Anagram Search
implementation
,
strings
1500
x4018
144B
Meeting
implementation
1300
x5287
144A
Arrival of the General
implementation
800
x97462
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4997
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13949
142E
Help Greg the Dwarf 2
geometry
3000
x80
142D
Help Shrek and Donkey 2
games
2600
x347
142C
Help Caretaker
brute force
,
dp
2300
x931
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2220
142A
Help Farmer
brute force
,
math
1600
x2633
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x1102
141D
Take-off Ramps
graphs
,
shortest paths
2300
x902
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2471
141B
Hopscotch
geometry
,
math
1400
x5408
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x84322
140F
New Year Snowflake
geometry
,
sortings
2600
x370
140E
New Year Garland
combinatorics
,
dp
2600
x948
140D
New Year Contest
greedy
,
sortings
1800
x2217
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4386
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1683
140A
New Year Table
geometry
,
math
1700
x4157
139B
Wallpaper
implementation
,
math
1600
x1311
139A
Petr and Book
implementation
1000
x31565
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x174
138D
World of Darkraft
dp
,
games
2500
x497
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x871
138B
Digits Permutations
greedy
1900
x1039
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