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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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two pointers
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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Name
1886E
I Wanna be the Team Leader
bitmasks
,
constructive algorithms
,
dp
,
greedy
,
math
,
sortings
,
two pointers
2400
x1339
220E
Little Elephant and Inversions
data structures
,
two pointers
2400
x1335
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1244
1443E
Long Permutation
brute force
,
math
,
two pointers
2400
x1225
498B
Name That Tune
dp
,
probabilities
,
two pointers
2400
x1149
1619H
Permutation and Queries
brute force
,
data structures
,
divide and conquer
,
two pointers
2400
x1075
1605E
Array Equalizer
binary search
,
greedy
,
implementation
,
math
,
number theory
,
sortings
,
two pointers
2400
x998
1194F
Crossword Expert
combinatorics
,
dp
,
number theory
,
probabilities
,
two pointers
2400
x971
733E
Sleep in Class
constructive algorithms
,
data structures
,
math
,
two pointers
2400
x866
581F
Zublicanes and Mumocrates
dp
,
trees
,
two pointers
2400
x851
639D
Bear and Contribution
data structures
,
greedy
,
sortings
,
two pointers
2400
x779
665F
Four Divisors
data structures
,
dp
,
math
,
number theory
,
sortings
,
two pointers
2400
x577
633E
Startup Funding
binary search
,
constructive algorithms
,
data structures
,
probabilities
,
two pointers
2400
x571
887D
Ratings and Reality Shows
data structures
,
two pointers
2400
x471
1403A
The Potion of Great Power
*special problem
,
2-sat
,
binary search
,
data structures
,
graphs
,
interactive
,
sortings
,
two pointers
2400
x286
1559D2
Mocha and Diana (Hard Version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
trees
,
two pointers
2500
x2537
1572B
Xor of 3
brute force
,
constructive algorithms
,
greedy
,
two pointers
2500
x1749
1327F
AND Segments
bitmasks
,
combinatorics
,
data structures
,
dp
,
two pointers
2500
x1608
1497E2
Square-free division (hard version)
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2500
x1568
1452E
Two Editorials
brute force
,
dp
,
greedy
,
sortings
,
two pointers
2500
x1487
1418G
Three Occurrences
data structures
,
divide and conquer
,
hashing
,
two pointers
2500
x1466
1550E
Stringforces
binary search
,
bitmasks
,
brute force
,
dp
,
strings
,
two pointers
2500
x1441
1665E
MinimizOR
bitmasks
,
brute force
,
data structures
,
divide and conquer
,
greedy
,
implementation
,
two pointers
2500
x1429
1381C
Mastermind
constructive algorithms
,
graph matchings
,
greedy
,
implementation
,
sortings
,
two pointers
2500
x1390
1438E
Yurii Can Do Everything
binary search
,
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
two pointers
2500
x1292
1712E2
LCM Sum (hard version)
brute force
,
data structures
,
math
,
number theory
,
two pointers
2500
x1183
1398F
Controversial Rounds
binary search
,
data structures
,
dp
,
greedy
,
two pointers
2500
x1068
1517E
Group Photo
binary search
,
data structures
,
implementation
,
two pointers
2500
x946
799E
Aquarium decoration
data structures
,
greedy
,
two pointers
2500
x915
1835B
Lottery
binary search
,
brute force
,
greedy
,
math
,
two pointers
2500
x906
1374E2
Reading Books (hard version)
data structures
,
greedy
,
implementation
,
sortings
,
ternary search
,
two pointers
2500
x902
1814D
Balancing Weapons
binary search
,
brute force
,
data structures
,
math
,
two pointers
2500
x822
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x821
444D
DZY Loves Strings
binary search
,
hashing
,
strings
,
two pointers
2500
x755
1312F
Attack on Red Kingdom
games
,
two pointers
2500
x718
55E
Very simple problem
geometry
,
two pointers
2500
x675
1771E
Hossam and a Letter
brute force
,
dp
,
implementation
,
two pointers
2500
x662
383B
Volcanoes
binary search
,
implementation
,
sortings
,
two pointers
2500
x653
314D
Sereja and Straight Lines
binary search
,
data structures
,
geometry
,
sortings
,
two pointers
2500
x515
989D
A Shade of Moonlight
binary search
,
geometry
,
math
,
sortings
,
two pointers
2500
x506
264D
Colorful Stones
dp
,
two pointers
2500
x407
166D
Shoe Store
dp
,
graph matchings
,
greedy
,
sortings
,
two pointers
2500
x346
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x272
1437F
Emotional Fishermen
combinatorics
,
dp
,
math
,
two pointers
2600
x1170
1699E
Three Days Grace
data structures
,
dp
,
greedy
,
math
,
number theory
,
two pointers
2600
x1088
1503D
Flip the Cards
2-sat
,
constructive algorithms
,
data structures
,
greedy
,
sortings
,
two pointers
2600
x968
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x933
372D
Choosing Subtree is Fun
binary search
,
data structures
,
dfs and similar
,
trees
,
two pointers
2600
x911
1400G
Mercenaries
bitmasks
,
brute force
,
combinatorics
,
dp
,
dsu
,
math
,
two pointers
2600
x903
1493E
Enormous XOR
bitmasks
,
constructive algorithms
,
greedy
,
math
,
strings
,
two pointers
2600
x865
1684F
Diverse Segments
data structures
,
two pointers
2600
x842
1500C
Matrix Sorting
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
two pointers
2600
x766
682E
Alyona and Triangles
geometry
,
two pointers
2600
x647
1599A
Weights
constructive algorithms
,
greedy
,
two pointers
2600
x634
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x322
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x65
1641D
Two Arrays
bitmasks
,
brute force
,
combinatorics
,
greedy
,
hashing
,
math
,
two pointers
2700
x1050
1887D
Split
binary search
,
data structures
,
divide and conquer
,
dsu
,
math
,
trees
,
two pointers
2700
x820
1511G
Chips on a Board
bitmasks
,
brute force
,
data structures
,
dp
,
games
,
two pointers
2700
x702
1514E
Baby Ehab's Hyper Apartment
binary search
,
graphs
,
interactive
,
sortings
,
two pointers
2700
x587
1313E
Concatenation with intersection
data structures
,
hashing
,
strings
,
two pointers
2700
x515
1841F
Monocarp and a Strategic Game
geometry
,
sortings
,
two pointers
2700
x473
1728G
Illumination
binary search
,
bitmasks
,
brute force
,
combinatorics
,
dp
,
math
,
two pointers
2700
x426
1131G
Most Dangerous Shark
data structures
,
dp
,
two pointers
2700
x401
1682F
MCMF?
data structures
,
flows
,
graphs
,
greedy
,
sortings
,
two pointers
2700
x288
48G
Galaxy Union
dp
,
trees
,
two pointers
2700
x254
293D
Ksusha and Square
geometry
,
math
,
probabilities
,
two pointers
2700
x234
592E
BCPC
binary search
,
geometry
,
two pointers
2700
x208
243D
Cubes
data structures
,
dp
,
geometry
,
two pointers
2700
x208
516D
Drazil and Morning Exercise
dfs and similar
,
dp
,
dsu
,
trees
,
two pointers
2800
x1228
204E
Little Elephant and Strings
data structures
,
implementation
,
string suffix structures
,
two pointers
2800
x1095
1609F
Interesting Sections
data structures
,
divide and conquer
,
meet-in-the-middle
,
two pointers
2800
x732
1819D
Misha and Apples
brute force
,
data structures
,
dp
,
two pointers
2800
x597
722F
Cyclic Cipher
chinese remainder theorem
,
data structures
,
implementation
,
number theory
,
two pointers
2800
x470
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x451
261E
Maxim and Calculator
brute force
,
dp
,
two pointers
2800
x405
406E
Hamming Triples
implementation
,
math
,
two pointers
2800
x228
1372E
Omkar and Last Floor
dp
,
greedy
,
two pointers
2900
x967
611G
New Year and Cake
geometry
,
two pointers
2900
x425
1500D
Tiles for Bathroom
data structures
,
sortings
,
two pointers
2900
x414
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x165
1901F
Landscaping
binary search
,
geometry
,
two pointers
2900
x144
618F
Double Knapsack
constructive algorithms
,
two pointers
3000
x1308
1446D2
Frequency Problem (Hard Version)
data structures
,
greedy
,
two pointers
3000
x1220
364E
Empty Rectangles
divide and conquer
,
two pointers
3000
x535
627E
Orchestra
two pointers
3000
x534
1381D
The Majestic Brown Tree Snake
dfs and similar
,
dp
,
greedy
,
trees
,
two pointers
3000
x447
1175G
Yet Another Partiton Problem
data structures
,
divide and conquer
,
dp
,
geometry
,
two pointers
3000
x432
1418F
Equal Product
data structures
,
math
,
number theory
,
two pointers
3000
x357
1476G
Minimum Difference
data structures
,
hashing
,
sortings
,
two pointers
3100
x531
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x421
1805F2
Survival of the Weakest (hard version)
greedy
,
math
,
sortings
,
two pointers
3100
x329
780H
Intranet of Buses
binary search
,
geometry
,
implementation
,
two pointers
3100
x116
1393E2
Twilight and Ancient Scroll (harder version)
dp
,
hashing
,
implementation
,
string suffix structures
,
strings
,
two pointers
3200
x350
1470E
Strange Permutation
binary search
,
combinatorics
,
data structures
,
dp
,
graphs
,
implementation
,
two pointers
3200
x293
1638F
Two Posters
brute force
,
data structures
,
greedy
,
two pointers
3200
x190
744E
Hongcow Masters the Cyclic Shift
strings
,
two pointers
3200
x133
1556G
Gates to Another World
bitmasks
,
data structures
,
dsu
,
two pointers
3300
x309
1396D
Rainbow Rectangles
data structures
,
sortings
,
two pointers
3300
x297
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x243
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