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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
24:47:00
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Difficulty:
—
constructive algorithms
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
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Custom test
Problems
#
Name
1939A
Draw Polygon Lines
*special problem
,
constructive algorithms
,
dp
,
geometry
,
interactive
x12
1193C
Scissors and Tape
*special problem
,
constructive algorithms
,
geometry
x35
1912C
Cactus Transformation
constructive algorithms
3300
x43
1170H
Longest Saw
*special problem
,
constructive algorithms
x43
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x47
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x54
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x54
1580E
Railway Construction
brute force
,
constructive algorithms
,
data structures
,
graphs
,
shortest paths
3400
x63
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x63
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x66
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x68
737F
Dirty plates
constructive algorithms
,
math
3300
x68
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x69
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x69
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x71
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x72
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x73
1276E
Four Stones
constructive algorithms
3500
x76
690F2
Tree of Life (medium)
constructive algorithms
,
hashing
,
trees
2700
x76
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x80
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x80
1218G
Alpha planetary system
constructive algorithms
,
graphs
,
shortest paths
3000
x83
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x85
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x85
1078E
Negative Time Summation
constructive algorithms
3400
x85
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x90
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x92
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x94
1762G
Unequal Adjacent Elements
constructive algorithms
,
sortings
3100
x95
720C
Homework
constructive algorithms
3100
x96
198D
Cube Snake
constructive algorithms
2700
x97
1685D2
Permutation Weight (Hard Version)
constructive algorithms
,
greedy
3500
x98
1930H
Interactive Mex Tree
constructive algorithms
,
dfs and similar
,
interactive
,
trees
3300
x99
1267H
Help BerLine
constructive algorithms
3200
x99
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x101
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x103
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x104
1887F
Minimum Segments
constructive algorithms
3400
x107
1940D
Almost Certainly
*special problem
,
constructive algorithms
,
data structures
,
sortings
x110
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x114
1924F
Anti-Proxy Attendance
constructive algorithms
,
dp
,
interactive
,
ternary search
3500
x115
1045E
Ancient civilizations
constructive algorithms
,
geometry
3200
x117
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x119
1949K
Make Triangle
constructive algorithms
,
math
x121
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x122
1530G
What a Reversal
constructive algorithms
3300
x122
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x124
1242E
Planar Perimeter
constructive algorithms
,
graphs
3200
x126
1774H
Maximum Permutation
constructive algorithms
3500
x127
472E
Design Tutorial: Learn from a Game
constructive algorithms
,
implementation
2800
x127
48H
Black and White
constructive algorithms
2800
x131
74E
Shift It!
constructive algorithms
2800
x136
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x137
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x141
1919G
Tree LGM
constructive algorithms
,
divide and conquer
,
games
,
trees
3500
x143
1302B
DAG
constructive algorithms
x143
1934E
Weird LCM Operations
brute force
,
constructive algorithms
,
number theory
3000
x145
1615G
Maximum Adjacent Pairs
constructive algorithms
,
graph matchings
3300
x145
1758F
Decent Division
constructive algorithms
,
data structures
3000
x150
317E
Princess and Her Shadow
constructive algorithms
,
shortest paths
3100
x150
1852E
Rivalries
constructive algorithms
,
data structures
,
greedy
3400
x152
1940B
Three Arrays
*special problem
,
constructive algorithms
,
implementation
,
sortings
x160
331E1
Deja Vu
constructive algorithms
,
graphs
,
implementation
2900
x161
316F3
Suns and Rays
constructive algorithms
,
dfs and similar
,
implementation
2200
x161
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x166
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x175
1740G
Dangerous Laser Power
constructive algorithms
,
dsu
,
sortings
3100
x176
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x176
98D
Help Monks
constructive algorithms
2500
x178
933E
A Preponderant Reunion
constructive algorithms
,
dp
3200
x184
1053E
Euler tour
constructive algorithms
,
trees
3500
x188
290E
HQ
*special problem
,
constructive algorithms
2500
x190
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x193
1663G
Six Characters
*special problem
,
constructive algorithms
,
strings
x199
1060H
Sophisticated Device
constructive algorithms
3300
x201
1949D
Funny or Scary?
constructive algorithms
x204
1267D
DevOps Best Practices
constructive algorithms
2800
x205
398C
Tree and Array
constructive algorithms
x207
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x208
1687E
Become Big For Me
combinatorics
,
constructive algorithms
,
greedy
,
math
,
number theory
3500
x208
1876E
Ball-Stackable
constructive algorithms
,
data structures
,
dp
,
trees
3300
x210
1781G
Diverse Coloring
constructive algorithms
,
trees
3200
x211
331E2
Deja Vu
constructive algorithms
,
dp
3100
x215
815E
Karen and Neighborhood
binary search
,
constructive algorithms
,
implementation
2900
x216
1896G
Pepe Racing
constructive algorithms
,
implementation
,
interactive
,
sortings
3200
x221
1270I
Xor on Figures
constructive algorithms
,
fft
,
math
3500
x222
952G
Puzzling Language
constructive algorithms
2200
x222
1286F
Harry The Potter
brute force
,
constructive algorithms
,
dp
,
fft
,
implementation
,
math
3100
x228
1684H
Hard Cut
constructive algorithms
,
dfs and similar
,
divide and conquer
,
math
3400
x229
715D
Create a Maze
constructive algorithms
3100
x231
1743G
Antifibonacci Cut
bitmasks
,
combinatorics
,
constructive algorithms
,
data structures
,
dp
,
hashing
,
math
3000
x237
1864G
Magic Square
combinatorics
,
constructive algorithms
,
implementation
3100
x238
793E
Problem of offices
constructive algorithms
,
dfs and similar
,
dp
,
trees
2900
x238
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x241
1386A
Colors
*special problem
,
binary search
,
constructive algorithms
,
interactive
2700
x244
173D
Deputies
constructive algorithms
,
graphs
,
greedy
,
implementation
2500
x245
1526F
Median Queries
constructive algorithms
,
interactive
,
probabilities
3000
x247
472F
Design Tutorial: Change the Goal
constructive algorithms
,
math
,
matrices
2700
x247
1054G
New Road Network
constructive algorithms
,
greedy
,
math
3300
x248
774H
Repairing Of String
*special problem
,
constructive algorithms
2200
x252
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