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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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data structures
combine-tags-by-or
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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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Problems
#
Name
1801G
A task for substrings
data structures
,
string suffix structures
,
strings
3400
x351
1801E
Gasoline prices
data structures
,
divide and conquer
,
dsu
,
hashing
,
trees
3000
x433
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x2057
1801C
Music Festival
binary search
,
data structures
,
dp
,
greedy
,
sortings
1900
x3240
1801B
Buying gifts
data structures
,
greedy
,
sortings
1800
x5829
1800D
Remove Two Letters
data structures
,
greedy
,
hashing
,
strings
1200
x21809
1800C2
Powering the Hero (hard version)
data structures
,
greedy
1100
x21410
1800C1
Powering the Hero (easy version)
data structures
,
greedy
1000
x22437
1799D2
Hot Start Up (hard version)
data structures
,
dp
2100
x2288
1799A
Recent Actions
data structures
,
greedy
,
implementation
,
math
800
x11369
1798B
Three Sevens
brute force
,
data structures
,
greedy
,
implementation
1000
x15930
1797F
Li Hua and Path
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
trees
3000
x329
1797E
Li Hua and Array
brute force
,
data structures
,
dsu
,
math
,
number theory
,
two pointers
2300
x1200
1797D
Li Hua and Tree
brute force
,
data structures
,
dfs and similar
,
dp
,
implementation
,
trees
1900
x3710
1796D
Maximum Subarray
data structures
,
dp
,
greedy
,
two pointers
2000
x3906
1795E
Explosions?
binary search
,
data structures
,
dp
,
greedy
,
math
2200
x1931
1795C
Tea Tasting
binary search
,
data structures
,
implementation
1500
x11506
1794E
Labeling the Tree with Distances
data structures
,
dp
,
greedy
,
hashing
,
implementation
,
trees
2400
x1017
1793F
Rebrending
brute force
,
data structures
,
divide and conquer
,
implementation
2600
x1292
1793E
Velepin and Marketing
binary search
,
data structures
,
dp
,
greedy
,
sortings
,
two pointers
2600
x933
1793C
Dora and Search
constructive algorithms
,
data structures
,
two pointers
1200
x18262
1792D
Fixed Prefix Permutations
binary search
,
bitmasks
,
data structures
,
hashing
,
math
,
sortings
1700
x5911
1791F
Range Update Point Query
binary search
,
brute force
,
data structures
1500
x11573
1790D
Matryoshkas
data structures
,
greedy
,
sortings
1200
x18293
1788E
Sum Over Zero
data structures
,
dfs and similar
,
dp
2200
x2482
1787I
Treasure Hunt
data structures
,
divide and conquer
,
two pointers
3400
x148
1787H
Codeforces Scoreboard
binary search
,
data structures
,
dp
,
geometry
3300
x201
1787G
Colorful Tree Again
brute force
,
data structures
,
trees
3000
x396
1784C
Monsters (hard version)
data structures
,
greedy
2200
x1534
1783G
Weighed Tree Radius
data structures
,
divide and conquer
,
implementation
,
trees
2800
x411
1783E
Game of the Year
brute force
,
data structures
,
math
,
number theory
2300
x2035
1781E
Rectangle Shrinking
binary search
,
brute force
,
data structures
,
greedy
,
implementation
,
two pointers
2300
x1269
1780F
Three Chairs
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
number theory
,
sortings
2300
x1381
1780E
Josuke and Complete Graph
binary search
,
brute force
,
data structures
,
math
,
number theory
2400
x1310
1779D
Boris and His Amazing Haircut
constructive algorithms
,
data structures
,
dp
,
dsu
,
greedy
,
sortings
1700
x7537
1779C
Least Prefix Sum
data structures
,
greedy
1600
x11876
1777F
Comfortably Numb
bitmasks
,
data structures
,
divide and conquer
,
strings
,
trees
2400
x823
1776E
Crossing the Railways
data structures
,
dp
3500
x62
1774G
Segment Covering
brute force
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
trees
3200
x372
1774F2
Magician and Pigs (Hard Version)
binary search
,
brute force
,
data structures
,
implementation
2700
x644
1774F1
Magician and Pigs (Easy Version)
brute force
,
data structures
,
implementation
2400
x1023
1771F
Hossam and Range Minimum Query
binary search
,
bitmasks
,
data structures
,
hashing
,
probabilities
,
strings
,
trees
2500
x972
1771D
Hossam and (sub-)palindromic tree
brute force
,
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2100
x2608
1770D
Koxia and Game
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
flows
,
games
,
graph matchings
,
graphs
,
implementation
2000
x3680
1767F
Two Subtrees
data structures
,
trees
3100
x248
1767C
Count Binary Strings
data structures
,
dp
2100
x2524
1767B
Block Towers
data structures
,
greedy
,
sortings
800
x19605
1766E
Decomposition
binary search
,
brute force
,
data structures
,
divide and conquer
,
dp
,
two pointers
2300
x1135
1765L
Project Manager
brute force
,
data structures
,
implementation
2400
x563
1764H
Doremy's Paint 2
data structures
3400
x167
1763F
Edge Queries
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
3000
x419
1763B
Incinerate
binary search
,
brute force
,
data structures
,
implementation
,
math
,
sortings
1200
x13955
1762F
Good Pairs
binary search
,
data structures
,
dp
2600
x562
1760E
Binary Inversions
data structures
,
greedy
,
math
1100
x19348
1760C
Advantage
data structures
,
implementation
,
sortings
800
x35200
1759G
Restore the Permutation
binary search
,
constructive algorithms
,
data structures
,
greedy
,
math
1900
x4247
1759F
All Possible Digits
binary search
,
data structures
,
greedy
,
math
,
number theory
1800
x3722
1758F
Decent Division
constructive algorithms
,
data structures
3000
x155
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x73
1750E
Bracket Cost
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
,
strings
2400
x1367
1749F
Distance to the Path
data structures
,
dfs and similar
,
trees
2800
x476
1749C
Number Game
binary search
,
data structures
,
games
,
greedy
,
implementation
1400
x13441
1748E
Yet Another Array Counting Problem
binary search
,
data structures
,
divide and conquer
,
dp
,
flows
,
math
,
trees
2300
x1739
1748C
Zero-Sum Prefixes
brute force
,
data structures
,
dp
,
greedy
,
implementation
1600
x10517
1747D
Yet Another Problem
binary search
,
bitmasks
,
constructive algorithms
,
data structures
1900
x4499
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x88
1746F
Kazaee
data structures
,
hashing
,
probabilities
2800
x1545
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x245
1743F
Intersection and Union
data structures
,
dp
,
matrices
,
probabilities
2300
x1419
1741F
Multi-Colored Segments
binary search
,
data structures
,
math
,
sortings
2000
x2236
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x105
1740H
MEX Tree Manipulation
data structures
,
trees
3300
x201
1740E
Hanging Hearts
constructive algorithms
,
data structures
,
dfs and similar
,
dp
,
greedy
,
trees
1800
x4119
1740D
Knowledge Cards
constructive algorithms
,
data structures
1500
x7726
1739F
Keyboard Design
bitmasks
,
data structures
,
dp
,
string suffix structures
,
strings
2600
x514
1739D
Reset K Edges
binary search
,
data structures
,
dfs and similar
,
graphs
,
greedy
,
trees
1900
x4895
1738H
Palindrome Addicts
data structures
,
strings
3300
x228
1738D
Permutation Addicts
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
trees
1900
x3332
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x108
1736C2
Good Subarrays (Hard Version)
binary search
,
data structures
,
dp
,
two pointers
2400
x1244
1736C1
Good Subarrays (Easy Version)
binary search
,
data structures
,
schedules
,
two pointers
1300
x14557
1735F
Pebbles and Beads
data structures
,
geometry
2900
x218
1735E
House Planning
constructive algorithms
,
data structures
,
graph matchings
,
greedy
2400
x1023
1735D
Meta-set
brute force
,
combinatorics
,
data structures
,
hashing
,
math
1700
x5305
1734D
Slime Escape
data structures
,
dp
,
greedy
,
two pointers
1800
x6047
1732E
Location
data structures
,
dp
,
math
,
number theory
2800
x414
1732D2
Balance (Hard version)
brute force
,
data structures
,
number theory
2400
x1368
1732D1
Balance (Easy version)
brute force
,
data structures
,
implementation
,
number theory
1500
x8304
1731D
Valiant's New Map
binary search
,
brute force
,
data structures
,
dp
,
two pointers
1700
x6771
1730F
Almost Sorted
bitmasks
,
data structures
,
dp
2700
x412
1730E
Maximums and Minimums
combinatorics
,
data structures
,
divide and conquer
,
number theory
2700
x615
1730C
Minimum Notation
data structures
,
greedy
,
math
,
sortings
1200
x16090
1730A
Planets
data structures
,
greedy
,
sortings
800
x22548
1728E
Red-Black Pepper
brute force
,
data structures
,
greedy
,
math
,
number theory
2300
x1655
1728C
Digital Logarithm
data structures
,
greedy
,
sortings
1400
x15315
1726G
A Certain Magical Party
combinatorics
,
data structures
,
greedy
,
sortings
3300
x283
1726F
Late For Work (submissions are not allowed)
data structures
,
greedy
,
schedules
,
shortest paths
2900
x131
1726C
Jatayu's Balanced Bracket Sequence
data structures
,
dsu
,
graphs
,
greedy
1300
x12093
1725L
Lemper Cooking Competition
data structures
2400
x877
1725K
Kingdom of Criticism
data structures
,
dsu
2500
x580
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