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Before contest
Educational Codeforces Round 165 (Rated for Div. 2)
24:14:01
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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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Problems
#
Name
1446E
Long Recovery
constructive algorithms
,
dfs and similar
3500
x76
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x76
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x75
1055G
Jellyfish Nightmare
3500
x75
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x75
207C2
Game with Two Trees
2200
x75
72B
INI-file
*special problem
,
implementation
2200
x75
1545E1
AquaMoon and Time Stop (easy version)
data structures
,
dp
3500
x74
1423E
5G Antenna Towers
geometry
2700
x74
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x74
73F
Plane of Tanks
brute force
,
geometry
2900
x74
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x73
1491I
Ruler Of The Zoo
brute force
,
data structures
3500
x73
1116D6
Hessenberg matrix
x73
1943F
Minimum Hamming Distance
dp
3500
x72
1874G
Jellyfish and Inscryption
dp
3500
x72
1868E
Min-Sum-Max
constructive algorithms
,
dp
,
greedy
3500
x72
1750H
BinaryStringForces
constructive algorithms
,
data structures
,
dp
3500
x72
1302F
Keep talking and nobody explodes -- easy
bitmasks
,
brute force
,
expression parsing
x72
923F
Public Service
constructive algorithms
,
graphs
,
trees
3200
x72
153E
Euclidean Distance
*special problem
2100
x72
72D
Perse-script
*special problem
,
expression parsing
2300
x72
1863H
Goldberg Machine 3
dp
,
trees
3500
x71
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x71
162I
Truncatable primes
*special problem
2000
x71
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x70
1326G
Spiderweb Trees
dp
,
geometry
,
trees
3500
x70
68E
Contact
geometry
2900
x70
1863I
Redundant Routes
constructive algorithms
,
dp
,
trees
3500
x69
1427H
Prison Break
binary search
,
games
,
geometry
,
ternary search
3500
x69
737F
Dirty plates
constructive algorithms
,
math
3300
x69
1949H
Division Avoidance
greedy
,
math
x68
1889F
Doremy's Average Tree
data structures
,
dp
,
greedy
,
trees
3500
x68
1868F
LIS?
data structures
,
greedy
,
implementation
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
1297G
M-numbers
*special problem
,
dp
,
math
x65
856E
Satellites
3100
x65
1936F
Grand Finale: Circles
binary search
,
geometry
3300
x64
1776N
Count Permutations
math
3500
x64
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
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x64
1070M
Algoland and Berland
constructive algorithms
,
divide and conquer
,
geometry
3000
x64
853E
Lada Malina
data structures
,
geometry
3400
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
661H
Rotate Matrix
*special problem
2400
x63
720E
Cipher
implementation
3100
x62
1776E
Crossing the Railways
data structures
,
dp
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
1909H
Parallel Swaps Sort
constructive algorithms
,
data structures
3500
x58
1578I
Interactive Rays
geometry
,
interactive
3300
x58
1510F
Fiber Shape
2800
x57
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x57
949F
Astronomy
geometry
,
probabilities
3300
x57
1275E3
Контрольная сумма
*special problem
x56
162G
Non-decimal sum
*special problem
2000
x55
1942H
Farmer John's Favorite Intern
data structures
,
dp
,
flows
,
trees
3500
x54
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x54
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x54
1666B
Budget Distribution
3300
x53
1116B2
Not A, not B or not C?
x53
863G
Graphic Settings
3200
x53
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x52
1340E
Nastya and Bees
graphs
,
interactive
,
probabilities
3000
x52
1938I
Symmetric Boundary
2800
x51
345G
Suffix Subgroup
*special problem
,
strings
2200
x51
661G
Hungarian Notation
*special problem
2200
x50
1930I
Counting Is Fun
combinatorics
3500
x49
1910G
Pool Records
*special problem
,
greedy
2700
x49
1220G
Geolocation
geometry
3400
x48
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x47
1357E2
Root of quantum Fourier transform
x47
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x46
1912C
Cactus Transformation
constructive algorithms
3300
x45
1302E
Amazing bitset
x45
690F3
Tree of Life (hard)
trees
3200
x45
1938M
Zig-zag
3500
x44
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x44
958A3
Death Stars (hard)
3100
x44
1578D
Dragon Curve
3200
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
345F
Superstitions Inspection
*special problem
2700
x43
345E
Black Cat Rush
*special problem
2700
x43
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