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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
16:11:33
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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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Custom test
Problems
#
Name
1792C
Min Max Sort
binary search
,
brute force
,
greedy
,
math
,
two pointers
1500
x14310
1792B
Stand-up Comedian
greedy
,
math
1200
x21611
1792A
GamingForces
greedy
,
sortings
800
x28351
1791G2
Teleporters (Hard Version)
binary search
,
greedy
,
sortings
1900
x4844
1791G1
Teleporters (Easy Version)
greedy
,
sortings
1100
x23242
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x12628
1791E
Negatives and Positives
dp
,
greedy
,
sortings
1100
x29138
1791D
Distinct Split
brute force
,
greedy
,
strings
1000
x31570
1791C
Prepend and Append
implementation
,
two pointers
800
x46912
1791B
Following Directions
geometry
,
implementation
800
x45063
1791A
Codeforces Checking
implementation
,
strings
800
x62204
1790G
Tokens on Graph
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2300
x1136
1790F
Timofey and Black-White Tree
brute force
,
dfs and similar
,
divide and conquer
,
graphs
,
greedy
,
math
,
shortest paths
,
trees
2100
x3394
1790E
Vlad and a Pair of Numbers
bitmasks
,
constructive algorithms
1400
x15337
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x20769
1790C
Premutation
brute force
,
implementation
,
math
1000
x24205
1790B
Taisia and Dice
greedy
,
greedy
,
math
800
x27580
1790A
Polycarp and the Day of Pi
implementation
,
math
,
strings
800
x37392
1789F
Serval and Brain Power
bitmasks
,
brute force
,
dp
,
greedy
,
implementation
,
strings
2700
x728
1789E
Serval and Music Game
brute force
,
dp
,
implementation
,
math
,
number theory
2500
x825
1789D
Serval and Shift-Shift-Shift
bitmasks
,
brute force
,
constructive algorithms
,
implementation
2200
x1699
1789C
Serval and Toxel's Arrays
combinatorics
,
dp
,
implementation
,
math
1500
x8659
1789B
Serval and Inversion Magic
brute force
,
implementation
,
strings
,
two pointers
800
x16287
1789A
Serval and Mocha's Array
brute force
,
math
,
number theory
800
x19599
1788F
XOR, Tree, and Queries
bitmasks
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
trees
2500
x873
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2724
1788D
Moving Dots
binary search
,
brute force
,
combinatorics
,
math
,
two pointers
2000
x3969
1788C
Matching Numbers
constructive algorithms
,
greedy
,
math
1300
x17460
1788B
Sum of Two Numbers
constructive algorithms
,
greedy
,
implementation
,
math
,
probabilities
1100
x20208
1788A
One and Two
brute force
,
implementation
,
math
800
x31775
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x222
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x237
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x445
1787F
Inverse Transformation
constructive algorithms
,
implementation
,
math
2500
x690
1787E
The Harmonization of XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
2100
x2375
1787D
Game on Axis
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
implementation
1900
x3430
1787C
Remove the Bracket
dp
,
greedy
,
math
1600
x7166
1787B
Number Factorization
greedy
,
math
,
number theory
1100
x13381
1787A
Exponential Equation
constructive algorithms
,
math
800
x19285
1786B
Cake Assembly Line
brute force
,
sortings
1300
x9042
1786A2
Alternating Deck (hard version)
implementation
800
x11466
1786A1
Non-alternating Deck (easy version)
implementation
800
x14097
1784F
Minimums or Medians
3400
x254
1784E
Infinite Game
brute force
,
combinatorics
,
dp
,
games
,
probabilities
3100
x347
1784D
Wooden Spoon
combinatorics
,
dp
2400
x1042
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1683
1784B
Letter Exchange
constructive algorithms
1900
x3359
1784A
Monsters (easy version)
brute force
,
greedy
1000
x15279
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x482
1783F
Double Sort II
dfs and similar
,
flows
,
graph matchings
,
graphs
2500
x1041
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2128
1783D
Different Arrays
brute force
,
dp
,
implementation
2000
x4506
1783C
Yet Another Tournament
binary search
,
greedy
,
sortings
1700
x9422
1783B
Matrix of Differences
constructive algorithms
,
math
1100
x17860
1783A
Make it Beautiful
constructive algorithms
,
math
,
sortings
800
x30954
1781H2
Window Signals (hard version)
3500
x97
1781H1
Window Signals (easy version)
3200
x119
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x232
1781F
Bracket Insertion
combinatorics
,
dp
,
math
,
trees
2700
x919
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1310
1781D
Many Perfect Squares
brute force
,
math
,
number theory
1800
x5559
1781C
Equal Frequencies
brute force
,
constructive algorithms
,
greedy
,
implementation
,
sortings
,
strings
1600
x7735
1781B
Going to the Cinema
brute force
,
greedy
,
sortings
1000
x13586
1781A
Parallel Projection
geometry
,
math
800
x15142
1780G
Delicious Dessert
binary search
,
dsu
,
hashing
,
math
,
number theory
,
string suffix structures
2400
x754
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1517
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1465
1780D
Bit Guessing Game
binary search
,
bitmasks
,
constructive algorithms
,
interactive
1800
x5009
1780B
GCD Partition
brute force
,
greedy
,
math
,
number theory
1100
x18454
1780A
Hayato and School
constructive algorithms
,
greedy
800
x21784
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x144
1779G
The Game of the Century
constructive algorithms
,
graphs
,
shortest paths
3000
x322
1779F
Xorcerer's Stones
bitmasks
,
constructive algorithms
,
dp
,
trees
2500
x1267
1779E
Anya's Simultaneous Exhibition
constructive algorithms
,
graphs
,
greedy
,
interactive
,
sortings
2400
x1802
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7985
1779C
Least Prefix Sum
data structures
,
greedy
1600
x12511
1779B
MKnez's ConstructiveForces Task
constructive algorithms
,
math
900
x23719
1779A
Hall of Fame
constructive algorithms
,
greedy
,
strings
800
x23218
1778F
Maximizing Root
dfs and similar
,
dp
,
graphs
,
math
,
number theory
,
trees
2600
x675
1778E
The Tree Has Fallen!
bitmasks
,
dfs and similar
,
math
,
trees
2500
x904
1778D
Flexible String Revisit
combinatorics
,
dp
,
math
,
probabilities
2100
x2829
1778C
Flexible String
bitmasks
,
brute force
,
strings
1600
x8362
1778B
The Forbidden Permutation
greedy
,
math
1300
x13394
1778A
Flip Flop Sum
greedy
,
implementation
800
x24495
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x978
1777E
Edge Reverse
binary search
,
dfs and similar
,
graphs
,
trees
2200
x1885
1777D
Score of a Tree
bitmasks
,
combinatorics
,
dfs and similar
,
dp
,
math
,
probabilities
,
trees
1900
x3556
1777C
Quiz Master
binary search
,
math
,
number theory
,
sortings
,
two pointers
1700
x8748
1777B
Emordnilap
combinatorics
,
greedy
,
math
900
x17637
1777A
Everybody Likes Good Arrays!
greedy
,
math
800
x25159
1776N
Count Permutations
math
3500
x83
1776M
Parmigiana With Seafood
binary search
,
dp
,
greedy
,
trees
3000
x378
1776L
Controllers
binary search
,
math
1500
x6236
1776K
Uniform Chemistry
dp
,
math
3200
x69
1776J
Italian Data Centers
graphs
,
shortest paths
2500
x703
1776I
Spinach Pizza
games
,
geometry
,
greedy
,
interactive
2500
x687
1776H
Beppa and SwerChat
two pointers
1300
x6502
1776G
Another Wine Tasting Event
combinatorics
,
constructive algorithms
,
math
,
strings
2100
x2083
1776F
Train Splitting
constructive algorithms
,
graphs
,
greedy
1700
x3524
1776E
Crossing the Railways
data structures
,
dp
3500
x73
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