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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
07:34:49
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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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Custom test
Problems
#
Name
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
x889
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
x3953
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x12983
1956B
Nene and the Card Game
games
,
greedy
800
x21312
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x21774
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1267
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x4581
1955F
Unfair Game
dp
,
games
,
greedy
,
math
,
schedules
1800
x7165
1955E
Long Inversions
brute force
,
greedy
,
implementation
,
sortings
1700
x8700
1955D
Inaccurate Subsequence Search
data structures
,
two pointers
1400
x15556
1955C
Inhabitant of the Deep Sea
greedy
,
implementation
,
math
1300
x21390
1955B
Progressive Square
constructive algorithms
,
data structures
,
implementation
,
sortings
1000
x28103
1955A
Yogurt Sale
math
800
x43832
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x256
1954E
Chain Reaction
binary search
,
data structures
,
dsu
,
greedy
,
implementation
,
math
,
number theory
2200
x2326
1954D
Colored Balls
combinatorics
,
dp
,
math
,
sortings
1800
x6242
1954C
Long Multiplication
greedy
,
math
,
number theory
1200
x19545
1954B
Make It Ugly
implementation
,
math
1200
x18684
1954A
Painting the Ribbon
constructive algorithms
,
greedy
,
math
900
x24285
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
x3667
1951D
Buying Jewels
constructive algorithms
,
greedy
,
math
2000
x5443
1951C
Ticket Hoarding
greedy
,
math
,
sortings
1400
x11743
1951B
Battle Cows
binary search
,
data structures
,
greedy
1200
x14713
1951A
Dual Trigger
constructive algorithms
,
greedy
,
math
900
x19838
1950G
Shuffling Songs
bitmasks
,
dfs and similar
,
dp
,
graphs
,
hashing
,
implementation
,
strings
1900
x4429
1950F
0, 1, 2, Tree!
bitmasks
,
brute force
,
greedy
,
implementation
,
trees
1700
x9239
1950E
Nearly Shortest Repeating Substring
brute force
,
implementation
,
number theory
,
strings
1500
x14550
1950D
Product of Binary Decimals
brute force
,
dp
,
implementation
,
number theory
1100
x23333
1950C
Clock Conversion
implementation
,
math
800
x40202
1950B
Upscaling
implementation
800
x38318
1950A
Stair, Peak, or Neither?
implementation
800
x53708
1949K
Make Triangle
constructive algorithms
,
math
2800
x332
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
2600
x404
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
1800
x1889
1949H
Division Avoidance
greedy
,
math
3100
x127
1949G
Scooter
graphs
,
greedy
2300
x796
1949F
Dating
greedy
,
sortings
,
trees
2200
x1009
1949E
Damage per Second
brute force
,
math
2900
x105
1949D
Funny or Scary?
constructive algorithms
2600
x416
1949C
Annual Ants' Gathering
dfs and similar
,
dp
,
greedy
,
trees
1900
x1798
1949B
Charming Meals
binary search
,
brute force
,
greedy
,
sortings
1500
x3356
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
x1338
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x3019
1948D
Tandem Repeats?
brute force
,
strings
,
two pointers
1700
x9528
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x17035
1948B
Array Fix
brute force
,
dp
,
greedy
,
implementation
1100
x23089
1948A
Special Characters
brute force
,
constructive algorithms
800
x28648
1946F
Nobody is needed
2-sat
,
data structures
,
dfs and similar
,
dp
2500
x983
1946E
Girl Permutation
combinatorics
,
dp
,
math
,
number theory
2200
x2583
1946D
Birthday Gift
bitmasks
,
brute force
,
constructive algorithms
,
greedy
,
implementation
1900
x4772
1946C
Tree Cutting
binary search
,
dp
,
greedy
,
implementation
,
trees
1600
x11060
1946B
Maximum Sum
dp
,
greedy
,
math
1100
x20566
1946A
Median of an Array
greedy
,
implementation
,
sortings
800
x26141
1945H
GCD is Greater
brute force
,
data structures
,
math
,
number theory
2600
x679
1945G
Cook and Porridge
binary search
,
constructive algorithms
,
data structures
,
implementation
2500
x749
1945F
Kirill and Mushrooms
data structures
,
sortings
1900
x4269
1945E
Binary Search
binary search
,
constructive algorithms
,
greedy
1700
x8266
1945D
Seraphim the Owl
dp
,
greedy
1300
x14582
1945C
Left and Right Houses
brute force
1200
x15042
1945B
Fireworks
math
,
number theory
900
x22853
1945A
Setting up Camp
greedy
,
math
800
x27841
1944B
Equal XOR
bitmasks
,
constructive algorithms
1100
x16297
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x23892
1943F
Minimum Hamming Distance
dp
3500
x112
1943E2
MEX Game 2 (Hard Version)
binary search
,
greedy
,
two pointers
3300
x306
1943E1
MEX Game 2 (Easy Version)
binary search
,
brute force
,
greedy
2900
x443
1943D2
Counting Is Fun (Hard Version)
combinatorics
,
dp
2800
x810
1943D1
Counting Is Fun (Easy Version)
brute force
,
combinatorics
,
dp
,
math
2400
x1515
1943C
Tree Compass
constructive algorithms
,
dfs and similar
,
greedy
,
trees
2300
x2134
1943B
Non-Palindromic Substring
hashing
,
implementation
,
math
,
strings
2000
x3895
1943A
MEX Game 1
games
,
greedy
1300
x18125
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x96
1942G
Bessie and Cards
combinatorics
,
dp
,
math
2800
x456
1942F
Farmer John's Favorite Function
brute force
,
data structures
,
implementation
,
math
2700
x702
1942E
Farm Game
combinatorics
,
games
2300
x1697
1942D
Learning to Paint
binary search
,
data structures
,
dfs and similar
,
dp
,
greedy
,
implementation
,
sortings
2100
x2825
1942C2
Bessie's Birthday Cake (Hard Version)
geometry
,
greedy
,
math
1700
x6207
1942C1
Bessie's Birthday Cake (Easy Version)
geometry
,
greedy
,
math
1300
x11051
1942B
Bessie and MEX
constructive algorithms
,
math
1100
x14051
1942A
Farmer John's Challenge
constructive algorithms
,
math
800
x17336
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x3588
1941F
Rudolf and Imbalance
binary search
,
greedy
,
sortings
,
two pointers
1800
x6102
1941E
Rudolf and k Bridges
binary search
,
data structures
,
dp
,
two pointers
1600
x9800
1941D
Rudolf and the Ball Game
dfs and similar
,
dp
,
implementation
1200
x18479
1941C
Rudolf and the Ugly String
dp
,
greedy
,
strings
900
x33603
1941B
Rudolf and 121
brute force
,
dp
,
greedy
,
math
1000
x30046
1941A
Rudolf and the Ticket
brute force
,
math
800
x42688
1938M
Zig-zag
3500
x61
1938L
XOR Operations
2800
x296
1938K
Tree Quiz
2400
x637
1938J
There and Back Again
2100
x1304
1938I
Symmetric Boundary
2800
x77
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