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CodeTON Round 8 (Div. 1 + Div. 2, Rated, Prizes!)
43:40:16
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→ Filter Problems
Difficulty:
—
graphs
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
#
Name
1950G
Shuffling Songs
bitmasks
,
dp
,
graphs
,
implementation
x1006
1949J
Amanda the Amoeba
graphs
,
implementation
,
trees
,
two pointers
x194
1949I
Disks
dfs and similar
,
geometry
,
graph matchings
,
graphs
x809
1949G
Scooter
graphs
,
greedy
x406
1948E
Clique Partition
brute force
,
constructive algorithms
,
graphs
,
greedy
,
implementation
2100
x2169
1948C
Arrow Path
brute force
,
constructive algorithms
,
dfs and similar
,
dp
,
graphs
,
shortest paths
1300
x12382
1944A
Destroying Bridges
graphs
,
greedy
,
math
800
x18653
1941G
Rudolf and Subway
constructive algorithms
,
dfs and similar
,
graphs
,
shortest paths
2000
x2543
1940C
Burenka and Pether
*special problem
,
data structures
,
dfs and similar
,
divide and conquer
,
dsu
,
graphs
,
sortings
,
trees
x24
1940A
Parallel Universes
*special problem
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
x72
1939B
Evidence Board
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
,
trees
x193
1936C
Pokémon Arena
data structures
,
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
2400
x944
1933F
Turtle Mission: Robot and the Earthquake
dfs and similar
,
dp
,
graphs
,
shortest paths
2100
x2010
1932G
Moving Platforms
graphs
,
math
,
number theory
,
shortest paths
2300
x792
1931F
Chat Screenshots
combinatorics
,
dfs and similar
,
graphs
1700
x6531
1929E
Sasha and the Happy Tree Cutting
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
2300
x1401
1928E
Modular Sequence
brute force
,
constructive algorithms
,
dp
,
graphs
,
greedy
,
math
,
number theory
2300
x1432
1927F
Microcycle
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
1900
x3530
1926G
Vlad and Trouble at MIT
dfs and similar
,
dp
,
flows
,
graphs
,
greedy
,
implementation
,
trees
1900
x2677
1923E
Count Paths
data structures
,
dfs and similar
,
dp
,
dsu
,
graphs
,
trees
2000
x2875
1920F2
Smooth Sailing (Hard Version)
binary search
,
data structures
,
dsu
,
geometry
,
graphs
,
trees
3000
x381
1920F1
Smooth Sailing (Easy Version)
binary search
,
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
shortest paths
2500
x845
1918F
Caterpillar on a Tree
dfs and similar
,
graphs
,
greedy
,
implementation
,
sortings
,
trees
2500
x710
1916F
Group Division
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2900
x383
1915G
Bicycles
graphs
,
greedy
,
implementation
,
shortest paths
,
sortings
1800
x5173
1914G2
Light Bulbs (Hard Version)
combinatorics
,
data structures
,
dfs and similar
,
dp
,
graphs
,
hashing
2300
x1153
1914G1
Light Bulbs (Easy Version)
brute force
,
combinatorics
,
dfs and similar
,
dp
,
dsu
,
graphs
,
math
,
trees
2100
x1593
1913E
Matrix Problem
flows
,
graphs
2400
x860
1912H
Hypercatapult Commute
graphs
2400
x344
1907G
Lights
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
2200
x1691
1904F
Beautiful Tree
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2800
x287
1904E
Tree Queries
data structures
,
dfs and similar
,
graphs
,
implementation
,
trees
2500
x771
1903F
Babysitting
2-sat
,
binary search
,
data structures
,
graphs
,
trees
2500
x518
1902F
Trees and XOR Queries Again
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
implementation
,
math
,
trees
2400
x852
1901E
Compressed Tree
dfs and similar
,
dp
,
graphs
,
greedy
,
sortings
,
trees
2200
x1313
1900E
Transitive Graph
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
2100
x1708
1899F
Alex's whims
constructive algorithms
,
graphs
,
greedy
,
shortest paths
,
trees
1600
x6412
1895E
Infinite Card Game
binary search
,
brute force
,
data structures
,
dfs and similar
,
dp
,
dsu
,
games
,
graphs
,
greedy
,
sortings
,
two pointers
2300
x1420
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x158
1893A
Anonymous Informant
brute force
,
dfs and similar
,
graphs
,
implementation
1400
x10934
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x84
1889D
Game of Stacks
brute force
,
dfs and similar
,
graphs
,
implementation
,
trees
3000
x493
1887E
Good Colorings
binary search
,
constructive algorithms
,
graphs
,
interactive
3100
x325
1887B
Time Travel
binary search
,
graphs
,
shortest paths
1900
x2584
1881F
Minimum Maximum Distance
dfs and similar
,
dp
,
graphs
,
shortest paths
,
trees
1700
x5688
1879E
Interactive Game with Coloring
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
implementation
,
interactive
,
trees
2400
x1162
1876F
Indefinite Clownfish
binary search
,
graphs
3500
x68
1876D
Lexichromatography
combinatorics
,
dfs and similar
,
dsu
,
graphs
,
two pointers
2500
x789
1876C
Autosynthesis
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
sortings
2100
x2083
1874C
Jellyfish and EVA
dp
,
graphs
,
greedy
,
math
,
probabilities
2300
x1474
1874B
Jellyfish and Math
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
,
shortest paths
2400
x1031
1873H
Mad City
dfs and similar
,
dsu
,
games
,
graphs
,
shortest paths
,
trees
1700
x6351
1872F
Selling a Menagerie
dfs and similar
,
dsu
,
graphs
,
implementation
,
math
1800
x5627
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x76
1868D
Flower-like Pseudotree
constructive algorithms
,
graphs
,
greedy
,
implementation
,
trees
3000
x241
1868B1
Candy Party (Easy Version)
bitmasks
,
constructive algorithms
,
graphs
,
greedy
,
implementation
,
math
1700
x6290
1867D
Cyclic Operations
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
,
implementation
1800
x5229
1866K
Keen Tree Calculation
binary search
,
data structures
,
dp
,
geometry
,
graphs
,
implementation
,
trees
2500
x399
1866C
Completely Searching for Inversions
dfs and similar
,
dp
,
graphs
1900
x2805
1864I
Future Dominators
graphs
,
greedy
3500
x80
1863G
Swaps
combinatorics
,
dp
,
graphs
,
math
2800
x512
1863E
Speedrun
brute force
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
2100
x2560
1860E
Fast Travel Text Editor
data structures
,
dfs and similar
,
graphs
,
shortest paths
2400
x1271
1859F
Teleportation in Byteland
data structures
,
dfs and similar
,
divide and conquer
,
graphs
,
shortest paths
,
trees
3200
x355
1857G
Counting Graphs
combinatorics
,
divide and conquer
,
dsu
,
graphs
,
greedy
,
sortings
,
trees
2000
x3967
1852B
Imbalanced Arrays
constructive algorithms
,
graphs
,
greedy
,
math
,
sortings
,
two pointers
1800
x4034
1851G
Vlad and the Mountains
binary search
,
data structures
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
,
two pointers
2000
x2831
1851E
Nastya and Potions
dfs and similar
,
dp
,
graphs
,
sortings
1500
x9185
1850H
The Third Letter
dfs and similar
,
dsu
,
graphs
,
greedy
,
implementation
1700
x7317
1846G
Rudolf and CodeVid-23
bitmasks
,
dp
,
graphs
,
greedy
,
shortest paths
1900
x3937
1844E
Great Grids
2-sat
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
2400
x1667
1843F1
Omsk Metro (simple version)
data structures
,
dfs and similar
,
dp
,
graphs
,
greedy
,
math
,
trees
1800
x4862
1842H
Tenzing and Random Real Numbers
bitmasks
,
dp
,
graphs
,
math
,
probabilities
3000
x532
1842D
Tenzing and His Animal Friends
constructive algorithms
,
graphs
,
greedy
1900
x3853
1840F
Railguns
brute force
,
dfs and similar
,
dp
,
graphs
2200
x1659
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x128
1835D
Doctor's Brown Hypothesis
dfs and similar
,
graphs
,
math
,
number theory
2900
x432
1833E
Round Dance
dfs and similar
,
dsu
,
graphs
,
shortest paths
1600
x9920
1830A
Copil Copac Draws Trees
dfs and similar
,
dp
,
graphs
,
trees
1400
x12133
1829F
Forever Winter
dfs and similar
,
graphs
,
math
1300
x15825
1829E
The Lakes
dfs and similar
,
dsu
,
graphs
,
implementation
1100
x17788
1826E
Walk the Runway
bitmasks
,
brute force
,
data structures
,
dp
,
graphs
,
implementation
,
sortings
2400
x1472
1823F
Random Walk
dp
,
graphs
,
math
,
probabilities
,
trees
2600
x750
1823E
Removing Graph
brute force
,
dp
,
games
,
graphs
,
math
2500
x1178
1822F
Gardening Friends
brute force
,
dfs and similar
,
dp
,
graphs
,
trees
1700
x5403
1817B
Fish Graph
brute force
,
constructive algorithms
,
dfs and similar
,
graphs
1900
x3770
1815F
OH NO1 (-2-3-4)
constructive algorithms
,
graphs
,
math
3500
x208
1815C
Between
constructive algorithms
,
dfs and similar
,
graphs
,
greedy
2200
x1816
1815B
Sum Graph
brute force
,
constructive algorithms
,
graphs
,
implementation
,
interactive
,
shortest paths
,
trees
2000
x2800
1811F
Is It Flower?
dfs and similar
,
graphs
,
implementation
2100
x1701
1810E
Monsters
brute force
,
data structures
,
dfs and similar
,
dsu
,
graphs
,
greedy
2100
x2920
1809F
Traveling in Berland
binary search
,
data structures
,
graphs
,
greedy
,
implementation
2500
x697
1805D
A Wide, Wide Graph
dfs and similar
,
dp
,
graphs
,
greedy
,
trees
1800
x5905
1804F
Approximate Diameter
binary search
,
divide and conquer
,
graphs
,
shortest paths
2700
x838
1804E
Routing
bitmasks
,
brute force
,
dfs and similar
,
dp
,
graphs
2400
x1340
1801D
The way home
binary search
,
data structures
,
dp
,
graphs
,
greedy
,
shortest paths
,
sortings
2100
x1997
1800E2
Unforgivable Curse (hard version)
brute force
,
constructive algorithms
,
dfs and similar
,
dsu
,
graphs
,
greedy
,
strings
1500
x11810
1800E1
Unforgivable Curse (easy version)
brute force
,
constructive algorithms
,
dsu
,
graphs
,
greedy
,
strings
1400
x11938
1797A
Li Hua and Maze
constructive algorithms
,
flows
,
graphs
,
greedy
,
implementation
800
x16798
1795G
Removal Sequences
bitmasks
,
dfs and similar
,
graphs
2700
x637
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