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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
28:21:23
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Difficulty:
—
math
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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Status
Standings
Custom test
Problems
#
Name
166C
Median
greedy
,
math
,
sortings
1500
x6531
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12363
160C
Find Pair
implementation
,
math
,
sortings
1700
x3458
154D
Flatland Fencing
games
,
math
2400
x433
154B
Colliders
math
,
number theory
1600
x4761
151A
Soft Drinking
implementation
,
math
800
x74698
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
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5404
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7344
148B
Escape
implementation
,
math
1500
x5513
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x93930
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1911
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13947
142A
Help Farmer
brute force
,
math
1600
x2630
141B
Hopscotch
geometry
,
math
1400
x5407
140A
New Year Table
geometry
,
math
1700
x4157
139B
Wallpaper
implementation
,
math
1600
x1311
136B
Ternary Logic
implementation
,
math
1100
x4880
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2361
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2051
131C
The World is a Theatre
combinatorics
,
math
1400
x11229
131B
Opposites Attract
implementation
,
math
1200
x7055
128E
Birthday
geometry
,
math
2900
x99
126D
Fibonacci Sums
dp
,
math
2300
x838
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1437
125A
Measuring Lengths in Baden
math
1400
x2737
124A
The number of positions
math
1000
x38764
123B
Squares
math
1800
x1134
120E
Put Knight!
games
,
math
1400
x2744
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3681
120A
Elevator
brute force
,
implementation
,
math
1000
x4840
117D
Not Quick Transformation
divide and conquer
,
math
2500
x340
117A
Elevator
implementation
,
math
1300
x2026
115C
Plumber
math
2200
x600
114A
Cifera
math
1000
x14202
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x119
113D
Museum
math
,
matrices
,
probabilities
2700
x686
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1240
112B
Petya and Square
implementation
,
math
1200
x4181
109E
Lucky Interval
brute force
,
math
2700
x102
108B
Datatypes
math
,
sortings
1400
x2471
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3507
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x6012
101C
Vectors
implementation
,
math
2000
x703
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x62
100I
Rotation
*special problem
,
geometry
,
math
1500
x351
100E
Lamps in a Line
*special problem
,
math
1600
x273
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x479
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x303
95D
Horse Races
dp
,
math
2500
x428
94B
Friends
graphs
,
implementation
,
math
1300
x4703
93E
Lostborn
dp
,
math
,
number theory
2600
x502
93D
Flags
dp
,
math
,
matrices
2500
x352
92A
Chips
implementation
,
math
800
x18961
90A
Cableway
greedy
,
math
1000
x4711
87C
Interesting Game
dp
,
games
,
math
2000
x1386
87A
Trains
implementation
,
math
1500
x5409
86E
Long sequence
brute force
,
math
,
matrices
2700
x189
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x13934
86B
Tetris revisited
constructive algorithms
,
graph matchings
,
greedy
,
math
2200
x415
86A
Reflection
math
1600
x1392
84A
Toy Army
math
,
number theory
900
x15169
83D
Numbers
dp
,
math
,
number theory
2400
x890
83B
Doctor
binary search
,
math
,
sortings
1800
x1703
83A
Magical Array
math
1300
x6277
82A
Double Cola
implementation
,
math
1100
x30394
81C
Average Score
greedy
,
math
,
sortings
1700
x1671
80B
Depression
geometry
,
math
1200
x4448
79E
Security System
math
2900
x136
78D
Archer's Shot
binary search
,
geometry
,
math
,
two pointers
2300
x330
77B
Falling Anvils
math
,
probabilities
1800
x2634
76E
Points
implementation
,
math
1700
x1720
76D
Plus and xor
dp
,
greedy
,
math
1700
x2075
76C
Mutation
bitmasks
,
dp
,
math
2700
x314
75D
Big Maximum Sum
data structures
,
dp
,
greedy
,
implementation
,
math
,
trees
2000
x1832
73E
Morrowindows
math
,
number theory
2400
x361
73A
The Elder Trolls IV: Oblivon
greedy
,
math
1600
x1356
72F
Oil
*special problem
,
greedy
,
math
1900
x120
72C
Extraordinarily Nice Numbers
*special problem
,
math
1200
x923
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x187
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6563
71B
Progress Bar
implementation
,
math
1300
x4559
70A
Cookies
math
1300
x3295
69A
Young Physicist
implementation
,
math
1000
x168025
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x472
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3187
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1824
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x243
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x339
62A
A Student's Dream
greedy
,
math
1300
x3461
61C
Capture Valerian
math
2000
x718
60E
Mushroom Gnomes
math
,
matrices
2600
x327
60D
Savior
brute force
,
dsu
,
math
2500
x452
57E
Chess
math
,
shortest paths
3000
x264
57D
Journey
dp
,
math
2500
x342
57C
Array
combinatorics
,
math
1900
x2689
55A
Flea travel
implementation
,
math
1200
x3473
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1327
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