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CodeTON Round 9 (Div. 1 + Div. 2, Rated, Prizes!)
4 days
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→ Filter Problems
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
1974G
Money Buys Less Happiness Now
data structures
,
greedy
,
sortings
x1585
1974F
Cutting Game
binary search
,
brute force
,
data structures
,
implementation
,
sortings
,
two pointers
x1360
1974E
Money Buys Happiness
dp
x3219
1974D
Ingenuity-2
constructive algorithms
,
implementation
x8384
1974C
Beautiful Triple Pairs
combinatorics
,
data structures
x8779
1974B
Symmetric Encoding
implementation
,
sortings
,
strings
x21562
1974A
Phone Desktop
greedy
,
math
x23135
1973F
Maximum GCD Sum Queries
bitmasks
,
brute force
,
dp
,
implementation
,
number theory
x79
1973E
Cat, Fox and Swaps
graphs
,
math
,
sortings
x418
1973D
Cat, Fox and Maximum Array Split
brute force
,
interactive
,
math
x1190
1973C
Cat, Fox and Double Maximum
constructive algorithms
,
greedy
,
implementation
,
math
,
sortings
x5441
1973B
Cat, Fox and the Lonely Array
binary search
,
bitmasks
,
data structures
,
greedy
,
math
,
two pointers
x9762
1973A
Chess For Three
brute force
,
dp
,
implementation
,
math
x17591
1972B
Coin Games
games
900
x16637
1972A
Contest Proposal
brute force
,
greedy
,
two pointers
800
x18443
1971H
±1
2-sat
,
dfs and similar
,
graphs
2100
x1096
1971G
XOUR
data structures
,
dsu
,
sortings
1400
x6356
1971F
Circle Perimeter
binary search
,
brute force
,
dfs and similar
,
geometry
,
implementation
,
math
1600
x6865
1971E
Find the Car
binary search
,
math
,
sortings
1500
x9787
1971D
Binary Cut
dp
,
greedy
,
implementation
,
sortings
,
strings
1100
x19583
1971C
Clock and Strings
implementation
900
x24561
1971B
Different String
implementation
,
strings
800
x27908
1971A
My First Sorting Problem
implementation
,
sortings
800
x33621
1970G3
Min-Fund Prison (Hard)
bitmasks
,
dfs and similar
,
dp
,
graphs
,
trees
2400
x186
1970G2
Min-Fund Prison (Medium)
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
2200
x338
1970G1
Min-Fund Prison (Easy)
dfs and similar
,
trees
1900
x737
1970F3
Playing Quidditch (Hard)
implementation
2300
x240
1970F2
Playing Quidditch (Medium)
implementation
2300
x247
1970F1
Playing Quidditch (Easy)
implementation
2300
x319
1970E3
Trails (Hard)
dp
,
matrices
2200
x395
1970E2
Trails (Medium)
dp
,
matrices
2000
x687
1970E1
Trails (Easy)
dp
1800
x1011
1970D3
Arithmancy (Hard)
interactive
3100
x64
1970D2
Arithmancy (Medium)
constructive algorithms
,
interactive
,
probabilities
,
strings
2600
x129
1970D1
Arithmancy (Easy)
brute force
,
constructive algorithms
,
interactive
,
strings
2100
x411
1970C3
Game on Tree (Hard)
dfs and similar
,
dp
,
games
,
trees
1900
x804
1970C2
Game on Tree (Medium)
dfs and similar
,
dp
,
games
,
trees
1700
x1274
1970C1
Game on Tree (Easy)
games
1400
x1643
1970B3
Exact Neighbours (Hard)
constructive algorithms
2300
x316
1970B2
Exact Neighbours (Medium)
constructive algorithms
2100
x490
1970B1
Exact Neighbours (Easy)
constructive algorithms
1900
x676
1970A3
Balanced Unshuffle (Hard)
constructive algorithms
,
trees
2400
x335
1970A2
Balanced Unshuffle (Medium)
brute force
,
constructive algorithms
,
trees
2400
x343
1970A1
Balanced Shuffle (Easy)
implementation
,
sortings
1000
x2317
1969F
Card Pairing
dp
,
greedy
,
hashing
,
implementation
3000
x114
1969E
Unique Array
binary search
,
data structures
,
divide and conquer
,
dp
,
greedy
2400
x963
1969D
Shop Game
data structures
,
greedy
,
math
,
sortings
1900
x3399
1969C
Minimizing the Sum
dp
,
implementation
1700
x6274
1969B
Shifts and Sorting
constructive algorithms
,
greedy
1000
x14655
1969A
Two Friends
constructive algorithms
,
implementation
,
math
800
x16234
1968G2
Division + LCP (hard version)
binary search
,
brute force
,
data structures
,
dp
,
hashing
,
math
,
string suffix structures
,
strings
2200
x1408
1968G1
Division + LCP (easy version)
binary search
,
data structures
,
dp
,
hashing
,
string suffix structures
,
strings
1900
x3198
1968F
Equal XOR Segments
binary search
,
data structures
1800
x4040
1968E
Cells Arrangement
constructive algorithms
1600
x8038
1968D
Permutation Game
brute force
,
dfs and similar
,
games
,
graphs
,
greedy
,
math
1300
x11911
1968C
Assembly via Remainders
constructive algorithms
,
number theory
1000
x19965
1968B
Prefiquence
greedy
,
two pointers
800
x23621
1968A
Maximize?
brute force
,
math
,
number theory
800
x27804
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x34
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x56
1967E1
Again Counting Arrays (Easy Version)
combinatorics
,
dp
,
fft
,
math
3100
x122
1967D
Long Way to be Non-decreasing
binary search
,
dfs and similar
,
graphs
,
implementation
,
shortest paths
,
two pointers
2800
x449
1967C
Fenwick Tree
bitmasks
,
brute force
,
combinatorics
,
data structures
,
dp
,
math
,
trees
2300
x1304
1967B2
Reverse Card (Hard Version)
brute force
,
math
,
number theory
2200
x3149
1967B1
Reverse Card (Easy Version)
brute force
,
math
,
number theory
1400
x10200
1967A
Permutation Counting
binary search
,
greedy
,
implementation
,
math
,
sortings
1400
x9527
1966B
Rectangle Filling
constructive algorithms
,
implementation
1100
x11936
1966A
Card Exchange
constructive algorithms
,
games
,
greedy
800
x14916
1965F
Conference
data structures
,
flows
3300
x80
1965E
Connected Cubes
constructive algorithms
,
games
3100
x178
1965D
Missing Subarray Sum
constructive algorithms
2900
x276
1965C
Folding Strip
constructive algorithms
,
greedy
,
strings
2300
x1458
1965B
Missing Subsequence Sum
bitmasks
,
constructive algorithms
,
greedy
,
number theory
1800
x5200
1965A
Everything Nim
games
,
greedy
,
math
,
sortings
1400
x10592
1958J
Necromancer
*special problem
3200
x11
1958I
Equal Trees
*special problem
,
graphs
,
meet-in-the-middle
3100
x18
1958H
Composite Spells
*special problem
,
dp
2600
x63
1958G
Observation Towers
*special problem
2400
x90
1958F
Narrow Paths
*special problem
,
combinatorics
2000
x147
1958E
Yet Another Permutation Constructive
*special problem
,
constructive algorithms
1900
x198
1958D
Staircase
*special problem
1600
x339
1958C
Firewood
*special problem
1500
x458
1958B
Clock in the Pool
*special problem
,
math
1400
x627
1958A
1-3-5
*special problem
,
dp
1100
x1011
1957F2
Frequency Mismatch (Hard Version)
binary search
,
data structures
,
dfs and similar
,
hashing
,
probabilities
,
trees
2700
x289
1957F1
Frequency Mismatch (Easy Version)
binary search
,
data structures
,
divide and conquer
,
hashing
,
probabilities
,
trees
2600
x351
1957E
Carousel of Combinations
brute force
,
combinatorics
,
dp
,
math
,
number theory
2400
x1023
1957D
A BIT of an Inequality
bitmasks
,
brute force
,
dp
,
math
1900
x3713
1957C
How Does the Rook Move?
combinatorics
,
dp
,
math
1600
x7808
1957B
A BIT of a Construction
bitmasks
,
constructive algorithms
,
greedy
,
implementation
1100
x15309
1957A
Stickogon
constructive algorithms
,
greedy
800
x20322
1956F
Nene and the Passing Game
constructive algorithms
,
data structures
,
dsu
,
graphs
,
sortings
3000
x266
1956E2
Nene vs. Monsters (Hard Version)
brute force
,
greedy
,
implementation
,
math
2700
x687
1956E1
Nene vs. Monsters (Easy Version)
brute force
,
implementation
,
math
2500
x1245
1956D
Nene and the Mex Operator
bitmasks
,
brute force
,
constructive algorithms
,
divide and conquer
,
dp
,
greedy
,
implementation
,
math
2000
x3298
1956C
Nene's Magical Matrix
constructive algorithms
,
greedy
,
math
1600
x10892
1956B
Nene and the Card Game
games
,
greedy
800
x19097
1956A
Nene's Game
binary search
,
brute force
,
data structures
,
games
,
greedy
800
x19254
1955H
The Most Reckless Defense
bitmasks
,
brute force
,
constructive algorithms
,
dp
,
flows
,
graph matchings
,
shortest paths
2300
x1045
1955G
GCD on a grid
brute force
,
dfs and similar
,
dp
,
implementation
,
math
,
number theory
1900
x3559
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