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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
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x70
68E
Contact
geometry
2900
x70
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x69
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x69
737F
Dirty plates
constructive algorithms
,
math
3300
x69
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x68
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x68
1218B
Guarding warehouses
data structures
,
geometry
3000
x68
1170G
Graph Decomposition
*special problem
,
graphs
x68
223D
Spider
geometry
,
graphs
3000
x68
1310F
Bad Cryptography
math
,
number theory
3400
x67
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
1599E
Two Arrays
data structures
,
matrices
3200
x66
1423A
Wakanda Forever
3500
x66
1211G
King's Path
*special problem
,
math
,
trees
2500
x66
164E
Polycarpus and Tasks
3100
x66
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x65
1297G
M-numbers
*special problem
,
dp
,
math
x65
856E
Satellites
3100
x65
1776K
Uniform Chemistry
dp
,
math
3200
x64
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x64
1517H
Fly Around the World
dp
,
geometry
3500
x64
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x64
853E
Lada Malina
data structures
,
geometry
3400
x64
661H
Rotate Matrix
*special problem
2400
x64
175F
Gnomes of Might and Magic
data structures
,
graphs
,
implementation
,
shortest paths
3000
x64
111E
Petya and Rectangle
2900
x64
44F
BerPaint
geometry
,
graphs
2700
x64
1970D3
Arithmancy (Hard)
interactive
3100
x63
1958H
Composite Spells
*special problem
,
dp
2600
x63
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x62
1776E
Crossing the Railways
data structures
,
dp
3500
x62
720E
Cipher
implementation
3100
x62
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x61
1666H
Heroes of Might
math
3500
x60
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x60
1939D
Big Persimmon
*special problem
,
dp
,
games
x59
1192A
Building Skyscrapers
*special problem
x59
993F
The Moral Dilemma
3200
x59
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x58
1510F
Fiber Shape
2800
x57
949F
Astronomy
geometry
,
probabilities
3300
x57
1967E2
Again Counting Arrays (Hard Version)
combinatorics
,
dp
,
math
3500
x56
1275E3
Контрольная сумма
*special problem
x56
162G
Non-decimal sum
*special problem
2000
x56
1116B2
Not A, not B or not C?
x55
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x54
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x54
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x54
1938I
Symmetric Boundary
2800
x53
1666B
Budget Distribution
3300
x53
863G
Graphic Settings
3200
x53
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x52
345G
Suffix Subgroup
*special problem
,
strings
2200
x52
1930I
Counting Is Fun
combinatorics
3500
x51
1910G
Pool Records
*special problem
,
greedy
2700
x51
661G
Hungarian Notation
*special problem
2200
x51
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x48
1357E2
Root of quantum Fourier transform
x48
1220G
Geolocation
geometry
3400
x48
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x46
1951I
Growing Trees
binary search
,
constructive algorithms
,
flows
,
graphs
,
greedy
3200
x45
1938M
Zig-zag
3500
x45
1912C
Cactus Transformation
constructive algorithms
3300
x45
1302E
Amazing bitset
x45
690F3
Tree of Life (hard)
trees
3200
x45
1578D
Dragon Curve
3200
x44
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x44
958A3
Death Stars (hard)
3100
x44
345F
Superstitions Inspection
*special problem
2700
x44
345E
Black Cat Rush
*special problem
2700
x44
1910J
Two Colors
*special problem
2900
x43
1431J
Zero-XOR Array
*special problem
,
dp
3400
x43
1431I
Cyclic Shifts
*special problem
,
strings
2900
x43
1346I
Pac-Man 2.0
*special problem
,
dp
2900
x43
1170H
Longest Saw
*special problem
,
constructive algorithms
x43
530I
Different variables
*special problem
2500
x43
1910I
Inverse Problem
*special problem
,
combinatorics
,
dp
2700
x42
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1533J
Pawns
*special problem
x41
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x41
1297H
Paint the String
*special problem
,
dp
,
strings
x40
1184C3
Heidi and the Turing Test (Hard)
3200
x40
683J
The Hero with Bombs
*special problem
3000
x40
1425C
Captain of Knights
math
3100
x39
683I
Loader
*special problem
,
graphs
2500
x38
1938A
Antiparticle Antiphysics
3500
x37
1571J
Two Railroads
*special problem
3000
x36
1423D
Does anyone else hate the wind?
3100
x35
1193C
Scissors and Tape
*special problem
,
constructive algorithms
,
geometry
x35
1170I
Good Subsets
*special problem
,
dp
x35
1967F
Next and Prev
brute force
,
data structures
,
implementation
3200
x34
1578G
Game of Chance
math
,
probabilities
3500
x34
1211I
Unusual Graph
*special problem
,
graphs
3000
x34
1488I
Demonic Invasion
*special problem
,
flows
3100
x33
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x32
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x31
1599D
Bubble Popping
3200
x29
1252I
Mission Possible
3000
x29
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