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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
3 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
#
Name
346E
Doodle Jump
math
,
number theory
3000
x265
346D
Robot Control
dp
,
graphs
,
shortest paths
2600
x754
346C
Number Transformation II
greedy
,
math
2200
x1437
346B
Lucky Common Subsequence
dp
,
strings
2000
x3570
346A
Alice and Bob
games
,
math
,
number theory
1600
x8717
345G
Suffix Subgroup
*special problem
,
strings
2200
x100
345F
Superstitions Inspection
*special problem
2700
x47
345E
Black Cat Rush
*special problem
2700
x50
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x79
345C
Counting Fridays
*special problem
2000
x126
345B
Triskaidekaphobia
*special problem
2100
x125
343E
Pumping Stations
brute force
,
dfs and similar
,
divide and conquer
,
flows
,
graphs
,
greedy
,
trees
2900
x764
343D
Water Tree
data structures
,
dfs and similar
,
graphs
,
trees
2100
x5860
343C
Read Time
binary search
,
greedy
,
two pointers
1900
x3021
343B
Alternating Current
data structures
,
greedy
,
implementation
1600
x14024
343A
Rational Resistance
math
,
number theory
1600
x8778
342E
Xenia and Tree
data structures
,
divide and conquer
,
trees
2400
x8581
342D
Xenia and Dominoes
bitmasks
,
dfs and similar
,
dp
2100
x500
342C
Cupboard and Balloons
geometry
1900
x1857
341E
Candies Game
constructive algorithms
,
greedy
3000
x457
341D
Iahub and Xors
data structures
2500
x1235
340E
Iahub and Permutations
combinatorics
,
math
2000
x2486
340C
Tourist Problem
combinatorics
,
implementation
,
math
1600
x4242
340B
Maximal Area Quadrilateral
brute force
,
geometry
2100
x2089
339E
Three Swaps
constructive algorithms
,
dfs and similar
,
greedy
2700
x551
339D
Xenia and Bit Operations
data structures
,
trees
1700
x26060
339C
Xenia and Weights
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
greedy
,
shortest paths
1700
x8332
338E
Optimize!
data structures
2600
x1000
338D
GCD Table
chinese remainder theorem
,
math
,
number theory
2900
x1171
337E
Divisor Tree
brute force
,
number theory
,
trees
2200
x1026
337D
Book of Evil
dfs and similar
,
divide and conquer
,
dp
,
trees
2000
x6191
337C
Quiz
binary search
,
greedy
,
math
,
matrices
,
number theory
1600
x4904
336E
Vasily the Bear and Painting Square
bitmasks
,
combinatorics
,
dp
,
implementation
2700
x116
336D
Vasily the Bear and Beautiful Strings
combinatorics
,
math
,
number theory
2100
x1013
336C
Vasily the Bear and Sequence
brute force
,
greedy
,
implementation
,
number theory
1800
x2470
336B
Vasily the Bear and Fly
math
1900
x1218
335F
Buy One, Get One Free
dp
,
greedy
3000
x556
335E
Counting Skyscrapers
dp
,
math
,
probabilities
2800
x225
335D
Rectangles and Square
brute force
,
dp
2400
x329
335C
More Reclamation
games
2100
x537
335B
Palindrome
constructive algorithms
,
dp
1900
x2110
333E
Summer Earnings
binary search
,
bitmasks
,
brute force
,
geometry
,
sortings
2500
x1137
333D
Characteristics of Rectangles
binary search
,
bitmasks
,
brute force
,
implementation
,
sortings
2100
x2121
333C
Lucky Tickets
brute force
,
constructive algorithms
2700
x392
333B
Chips
greedy
1800
x2652
333A
Secrets
greedy
1600
x4050
332E
Binary Key
dp
,
greedy
,
implementation
2400
x302
332D
Theft of Blueprints
graphs
,
math
2400
x385
332C
Students' Revenge
data structures
,
greedy
,
sortings
2200
x915
331E2
Deja Vu
constructive algorithms
,
dp
3100
x218
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x165
331D3
Escaping on Beaveractor
data structures
,
implementation
,
trees
3000
x178
331D2
Escaping on Beaveractor
graphs
2600
x135
331D1
Escaping on Beaveractor
dfs and similar
,
implementation
2400
x205
331C3
The Great Julya Calendar
dp
2500
x499
331C2
The Great Julya Calendar
dp
2400
x389
331B2
Shave Beaver!
data structures
1900
x726
331B1
Shave Beaver!
implementation
1700
x738
329E
Evil
math
3100
x169
329D
The Evil Temple and the Moving Rocks
constructive algorithms
2500
x407
329C
Graph Reconstruction
constructive algorithms
2400
x912
328A
IQ Test
implementation
1800
x2085
327E
Axis Walking
bitmasks
,
combinatorics
,
constructive algorithms
,
dp
,
meet-in-the-middle
2300
x1411
327D
Block Tower
constructive algorithms
,
dfs and similar
,
graphs
1900
x2284
327C
Magic Five
combinatorics
,
math
1700
x3225
325E
The Red Button
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
greedy
2800
x831
325D
Reclamation
dsu
2900
x543
325C
Monsters and Diamonds
dfs and similar
,
graphs
,
shortest paths
2600
x350
325B
Stadium and Games
binary search
,
math
1800
x1568
323C
Two permutations
data structures
2400
x600
323B
Tournament-graph
constructive algorithms
,
graphs
2200
x401
323A
Black-and-White Cube
combinatorics
,
constructive algorithms
1600
x746
322B
Ciel and Flowers
combinatorics
,
math
1600
x11869
321E
Ciel and Gondolas
data structures
,
divide and conquer
,
dp
2600
x5047
321D
Ciel and Flipboard
dp
,
greedy
,
math
2900
x547
321C
Ciel the Commander
constructive algorithms
,
dfs and similar
,
divide and conquer
,
greedy
,
trees
2100
x7411
321B
Ciel and Duel
dp
,
flows
,
greedy
1900
x3124
321A
Ciel and Robot
binary search
,
implementation
,
math
1700
x3650
319E
Ping-Pong
data structures
3000
x662
319D
Have You Ever Heard About the Word?
greedy
,
hashing
,
string suffix structures
,
strings
2800
x666
319C
Kalila and Dimna in the Logging Industry
dp
,
geometry
2100
x5276
319B
Psychos in a Line
data structures
,
implementation
1900
x4191
319A
Malek Dance Club
combinatorics
,
math
1600
x2804
317E
Princess and Her Shadow
constructive algorithms
,
shortest paths
3100
x155
317D
Game with Powers
dp
,
games
2300
x1084
317C
Balance
constructive algorithms
,
dfs and similar
,
graphs
,
trees
2500
x506
317B
Ants
brute force
,
implementation
2000
x1604
317A
Perfect Pair
brute force
1600
x4662
316G3
Good Substrings
string suffix structures
2400
x499
316G2
Good Substrings
string suffix structures
2200
x475
316G1
Good Substrings
hashing
,
strings
1700
x967
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x182
316F2
Suns and Rays
2300
x166
316F1
Suns and Rays
dfs and similar
,
implementation
2200
x180
316E3
Summer Homework
data structures
,
math
2300
x533
316E2
Summer Homework
data structures
,
math
2300
x400
316D3
PE Lesson
dp
,
math
2400
x601
316D2
PE Lesson
dp
2300
x456
316D1
PE Lesson
brute force
,
dp
2300
x525
316C2
Tidying Up
flows
,
graph matchings
2300
x637
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