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ICPC Challenge
Please subscribe to the official Codeforces channel in Telegram via the link
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Codeforces Round 912 (Div. 2)
28:21:32
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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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Problems
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Status
Standings
Custom test
Problems
#
Name
1578C
Cactus Lady and her Cing
3500
x7
1773L
Lisa's Sequences
dp
3500
x22
1773C
Cactus Meets Torus
3500
x26
1578G
Game of Chance
math
,
probabilities
3500
x28
1889E
Doremy's Swapping Trees
dfs and similar
,
graphs
,
trees
3500
x34
1776N
Count Permutations
math
3500
x40
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x42
1874G
Jellyfish and Inscryption
dp
3500
x44
1876F
Indefinite Clownfish
binary search
,
graphs
3500
x46
1868F
LIS?
data structures
,
greedy
,
implementation
3500
x47
1776E
Crossing the Railways
data structures
,
dp
3500
x50
1876G
Clubstep
binary search
,
brute force
,
data structures
,
greedy
,
trees
3500
x55
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x57
1666H
Heroes of Might
math
3500
x57
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x58
1863H
Goldberg Machine 3
dp
,
trees
3500
x59
1870H
Standard Graph Problem
data structures
,
graphs
,
greedy
,
trees
3500
x60
1517H
Fly Around the World
dp
,
geometry
3500
x60
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x60
1423A
Wakanda Forever
3500
x63
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x64
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x64
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x65
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x66
1864I
Future Dominators
graphs
,
greedy
3500
x67
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x67
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x69
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x69
1687F
Koishi's Unconscious Permutation
fft
,
math
3500
x70
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x71
1276E
Four Stones
constructive algorithms
3500
x71
1055G
Jellyfish Nightmare
3500
x71
1545E2
AquaMoon and Time Stop (hard version)
data structures
,
dp
3500
x72
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x73
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x74
1349E
Slime and Hats
constructive algorithms
,
dp
,
greedy
3500
x74
1656I
Neighbour Ordering
constructive algorithms
,
graphs
3500
x75
1540E
Tasty Dishes
math
,
matrices
3500
x77
1628F
Spaceship Crisis Management
binary search
,
data structures
,
geometry
,
sortings
3500
x78
1428H
Rotary Laser Lock
binary search
,
interactive
3500
x79
1781H2
Window Signals (hard version)
3500
x82
1667F
Yin Yang
implementation
3500
x82
1770H
Koxia, Mahiru and Winter Festival
constructive algorithms
3500
x83
1322F
Assigning Fares
dp
,
trees
3500
x83
1677F
Tokitsukaze and Gems
dp
,
math
3500
x84
1609H
Pushing Robots
3500
x84
1852F
Panda Meetups
data structures
,
dp
,
flows
3500
x85
1746G
Olympiad Training
binary search
,
data structures
,
dp
,
flows
,
geometry
,
implementation
,
sortings
3500
x86
1071E
Rain Protection
binary search
,
geometry
3500
x86
1854F
Mark and Spaceship
brute force
,
dp
3500
x88
1737G
Ela Takes Dancing Class
binary search
,
data structures
3500
x89
1641F
Covering Circle
geometry
3500
x89
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x90
1545F
AquaMoon and Potatoes
brute force
,
data structures
,
dp
3500
x90
1761G
Centroid Guess
interactive
,
probabilities
,
trees
3500
x91
1740I
Arranging Crystal Balls
data structures
,
divide and conquer
,
divide and conquer
,
dp
,
geometry
,
graphs
,
number theory
3500
x93
1842I
Tenzing and Necklace
divide and conquer
,
dp
,
greedy
3500
x94
1685D2
Permutation Weight (Hard Version)
constructive algorithms
,
greedy
3500
x94
1827F
Copium Permutation
constructive algorithms
,
data structures
,
greedy
3500
x95
1081H
Palindromic Magic
data structures
,
hashing
,
strings
3500
x95
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x96
1508F
Optimal Encoding
brute force
,
data structures
3500
x96
1874F
Jellyfish and OEIS
dp
3500
x97
1648F
Two Avenues
data structures
,
dfs and similar
,
graphs
3500
x97
799G
Cut the pie
binary search
,
data structures
,
geometry
3500
x98
1893E
Cacti Symphony
combinatorics
,
dfs and similar
,
dp
,
graphs
3500
x99
1305H
Kuroni the Private Tutor
binary search
,
greedy
3500
x99
1349F2
Slime and Sequences (Hard Version)
dp
,
fft
,
math
3500
x100
1237G
Balanced Distribution
data structures
,
dp
,
greedy
3500
x100
1621I
Two Sequences
data structures
,
hashing
,
string suffix structures
3500
x102
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x104
1423C
Dušan's Railway
divide and conquer
,
graphs
,
trees
3500
x105
1824E
LuoTianyi and Cartridge
data structures
,
trees
3500
x106
1819F
Willy-nilly, Crack, Into Release!
data structures
,
dp
3500
x108
1470F
Strange Covering
divide and conquer
3500
x108
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x109
1394E
Boboniu and Banknote Collection
strings
3500
x113
1835F
Good Graph
bitmasks
,
dfs and similar
,
graph matchings
,
graphs
,
implementation
3500
x114
1444E
Finding the Vertex
brute force
,
dfs and similar
,
dp
,
interactive
,
trees
3500
x116
1503F
Balance the Cards
constructive algorithms
,
data structures
,
divide and conquer
,
geometry
,
graphs
,
implementation
3500
x117
1208H
Red Blue Tree
data structures
,
implementation
,
trees
3500
x121
1774H
Maximum Permutation
constructive algorithms
3500
x122
1779H
Olympic Team Building
brute force
,
meet-in-the-middle
3500
x124
1685E
The Ultimate LIS Problem
data structures
,
greedy
3500
x124
1707F
Bugaboo
bitmasks
,
constructive algorithms
,
dp
,
number theory
3500
x127
1608G
Alphabetic Tree
binary search
,
data structures
,
dfs and similar
,
hashing
,
string suffix structures
,
strings
,
trees
3500
x128
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x129
1423N
BubbleSquare Tokens
3500
x135
1434E
A Convex Game
dsu
,
games
3500
x136
1320F
Blocks and Sensors
brute force
3500
x136
1534H
Lost Nodes
constructive algorithms
,
dp
,
graphs
,
interactive
,
sortings
,
trees
3500
x138
1210G
Mateusz and Escape Room
dp
3500
x140
1817F
Entangled Substrings
string suffix structures
,
strings
3500
x143
1621H
Trains and Airplanes
dfs and similar
,
graphs
,
shortest paths
,
trees
3500
x143
1246F
Cursor Distance
3500
x144
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x145
1178H
Stock Exchange
binary search
,
flows
,
graphs
3500
x151
1423G
Growing flowers
data structures
3500
x153
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x154
750H
New Year and Snowy Grid
dfs and similar
,
dsu
,
graphs
,
interactive
3500
x166
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