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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
40:11:33
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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
1958B
Clock in the Pool
*special problem
,
math
1400
x905
1958A
1-3-5
*special problem
,
dp
1100
x1987
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x444
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x502
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1280
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x4535
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x9731
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x18013
1957A
Stickogon
constructive algorithms
,
greedy
800
x23390
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x366
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x888
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1470
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3951
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12977
1956B
Nene and the Card Game
games
,
greedy
800
x21306
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x21767
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1265
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4580
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x7158
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8696
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x15554
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x21383
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x28092
1955A
Yogurt Sale
math
800
x43808
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x256
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2323
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x6241
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x19536
1954B
Make It Ugly
implementation
,
math
1200
x18680
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x24279
1953A
Accuracy-Preserving Summation Algorithm
*special problem
1952J
Help, what does it mean to be "Based"
brute force
,
constructive algorithms
,
expression parsing
,
implementation
,
sortings
x775
1952I
Dark Matter
bitmasks
,
geometry
x539
1952H
Palindrome
implementation
,
strings
x701
1952G
Mathematician Takeover
binary search
,
dfs and similar
,
math
x1033
1952F
Grid
brute force
x1752
1952E
Sweep Line
combinatorics
,
games
,
math
x258
1952D
Are You a Procrastinator?
implementation
x4620
1952C
They Have Fooled
brute force
,
schedules
x2912
1952B
Is it stated?
strings
x11173
1952A
Are You a Robot, Again?
strings
x12483
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x76
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x284
1951G
Clacking Balls
combinatorics
,
math
,
probabilities
3100
x337
1951F
Inversion Composition
constructive algorithms
,
data structures
,
greedy
2500
x769
1951E
No Palindromes
brute force
,
constructive algorithms
,
divide and conquer
,
greedy
,
hashing
,
implementation
,
math
,
strings
2000
x3666
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x5442
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x11741
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x14707
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x19828
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4425
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x9232
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x14543
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x23324
1950C
Clock Conversion
implementation
,
math
800
x40187
1950B
Upscaling
implementation
800
x38302
1950A
Stair, Peak, or Neither?
implementation
800
x53664
1949K
Make Triangle
constructive algorithms
,
math
2800
x330
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x401
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1888
1949H
Division Avoidance
greedy
,
math
3100
x127
1949G
Scooter
graphs
,
greedy
2300
x794
1949F
Dating
greedy
,
sortings
,
trees
2200
x1008
1949E
Damage per Second
brute force
,
math
2900
x105
1949D
Funny or Scary?
constructive algorithms
2600
x415
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1797
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3350
1949A
Grove
brute force
,
dfs and similar
,
dp
,
geometry
,
probabilities
3300
x115
1948G
MST with Matching
bitmasks
,
brute force
,
dsu
,
graph matchings
,
trees
3100
x701
1948F
Rare Coins
combinatorics
,
math
,
probabilities
2500
x1337
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x3013
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9525
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x17017
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x23082
1948A
Special Characters
brute force
,
constructive algorithms
800
x28645
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x982
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2580
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4768
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x11056
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x20558
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x26139
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x678
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x749
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x4266
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x8259
1945D
Seraphim the Owl
dp
,
greedy
1300
x14575
1945C
Left and Right Houses
brute force
1200
x15034
1945B
Fireworks
math
,
number theory
900
x22836
1945A
Setting up Camp
greedy
,
math
800
x27828
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x16290
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x23875
1943F
Minimum Hamming Distance
dp
3500
x112
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x305
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x442
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x808
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1514
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2133
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3890
1943A
MEX Game 1
games
,
greedy
1300
x18116
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x96
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