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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
39:44:34
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Difficulty:
—
greedy
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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Problems
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Status
Standings
Custom test
Problems
#
Name
1979A
Guess the Maximum
brute force
,
greedy
,
implementation
800
x29080
1978E
Computing Machine
brute force
,
data structures
,
dp
,
greedy
,
implementation
2000
x3839
1978D
Elections
data structures
,
greedy
,
implementation
,
math
1600
x11351
1978C
Manhattan Permutations
constructive algorithms
,
data structures
,
greedy
,
implementation
,
math
1300
x15003
1978B
New Bakery
binary search
,
greedy
,
math
,
ternary search
800
x22407
1978A
Alice and Books
constructive algorithms
,
greedy
,
sortings
800
x25773
1977D
XORificator
bitmasks
,
brute force
,
greedy
,
hashing
2300
x1865
1977C
Nikita and LCM
brute force
,
data structures
,
dp
,
greedy
,
math
,
number theory
,
sortings
1900
x6785
1977B
Binary Colouring
bitmasks
,
constructive algorithms
,
greedy
,
math
1100
x17687
1976F
Remove Bridges
data structures
,
dfs and similar
,
dp
,
greedy
,
sortings
,
trees
2800
x592
1976E
Splittable Permutations
combinatorics
,
data structures
,
dfs and similar
,
greedy
,
math
,
trees
2500
x1046
1976C
Job Interview
binary search
,
dp
,
greedy
,
implementation
,
two pointers
1600
x10425
1976B
Increase/Decrease/Copy
greedy
,
implementation
1100
x22312
1975H
378QAQ and Core
greedy
,
strings
3500
x116
1975G
Zimpha Fan Club
fft
,
greedy
,
math
,
strings
3000
x235
1975D
Paint the Tree
brute force
,
dfs and similar
,
dp
,
greedy
,
shortest paths
,
trees
1700
x6066
1975C
Chamo and Mocha's Array
binary search
,
brute force
,
greedy
1200
x14622
1975B
378QAQ and Mocha's Array
brute force
,
greedy
,
math
,
sortings
1000
x17906
1975A
Bazoka and Mocha's Array
brute force
,
greedy
,
implementation
,
sortings
800
x18543
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
2000
x4384
1974D
Ingenuity-2
constructive algorithms
,
greedy
,
implementation
1400
x14868
1974A
Phone Desktop
greedy
,
math
800
x33296
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
1700
x8402
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
1300
x14161
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x23003
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x25975
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x277
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x1391
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x4650
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x19166
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x14998
1968B
Prefiquence
greedy
,
two pointers
800
x28010
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x12547
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x17927
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1951
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x6770
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x13810
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x18013
1957A
Stickogon
constructive algorithms
,
greedy
800
x23391
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x888
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
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x7158
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8696
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x21383
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2323
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x19536
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x24279
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x76
1951H
Thanos Snap
binary search
,
dp
,
games
,
greedy
,
trees
3200
x284
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
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x9232
1949H
Division Avoidance
greedy
,
math
3100
x127
1949G
Scooter
graphs
,
greedy
2300
x794
1949F
Dating
greedy
,
sortings
,
trees
2200
x1008
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1797
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3350
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x3013
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x23082
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
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x8259
1945D
Seraphim the Owl
dp
,
greedy
1300
x14575
1945A
Setting up Camp
greedy
,
math
800
x27828
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x23875
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
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2133
1943A
MEX Game 1
games
,
greedy
1300
x18116
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2823
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x6201
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x11038
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x6100
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x33588
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x30040
1937B
Binary Path
dp
,
greedy
,
implementation
1300
x15153
1936D
Bitwise Paradox
binary search
,
bitmasks
,
data structures
,
greedy
,
two pointers
3100
x518
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x1340
1936A
Bitwise Operation Wizard
bitmasks
,
constructive algorithms
,
greedy
,
interactive
,
math
1700
x7526
1935F
Andrey's Tree
binary search
,
constructive algorithms
,
data structures
,
dfs and similar
,
dsu
,
greedy
,
implementation
,
trees
2800
x454
1935E
Distance Learning Courses in MAC
bitmasks
,
brute force
,
data structures
,
greedy
,
math
2400
x1381
1935C
Messenger in MAC
binary search
,
brute force
,
constructive algorithms
,
data structures
,
dp
,
greedy
,
sortings
1800
x8263
1934D2
XOR Break --- Game Version
bitmasks
,
games
,
greedy
,
interactive
2400
x1402
1934D1
XOR Break --- Solo Version
bitmasks
,
constructive algorithms
,
greedy
2100
x3557
1934C
Find a Mine
binary search
,
constructive algorithms
,
geometry
,
greedy
,
interactive
,
math
1700
x6863
1934B
Yet Another Coin Problem
brute force
,
dp
,
greedy
,
math
1200
x19097
1934A
Too Min Too Max
greedy
,
math
800
x25539
1933D
Turtle Tenacity: Continual Mods
constructive algorithms
,
greedy
,
math
,
number theory
,
sortings
1200
x20455
1933A
Turtle Puzzle: Rearrange and Negate
greedy
,
math
,
sortings
800
x38368
1932D
Card Game
greedy
,
implementation
1400
x11583
1932A
Thorns and Coins
dp
,
greedy
,
implementation
800
x29895
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