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Before contest
Codeforces Round #792 (Div. 1)
3 days
Before contest
Codeforces Round #792 (Div. 2)
3 days
→ Filter Problems
Difficulty:
—
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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Custom test
Problems
#
Name
1576A
Communication Routing Challenge
*special problem
1160A2
Collaboration
*special problem
775A
University Schedule
*special problem
2900
1571J
Two Railroads
*special problem
3000
x14
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x20
1297I
Falling Blocks
*special problem
,
data structures
x20
1488I
Demonic Invasion
*special problem
,
flows
3100
x22
1211I
Unusual Graph
*special problem
,
graphs
3000
x22
1170I
Good Subsets
*special problem
,
dp
x24
1193C
Scissors and Tape
*special problem
,
constructive algorithms
,
geometry
x28
1571H
Laser Beams
*special problem
,
geometry
,
probabilities
2900
x29
1431J
Zero-XOR Array
*special problem
,
dp
3400
x29
683I
Loader
*special problem
2500
x29
1431I
Cyclic Shifts
*special problem
,
strings
2900
x30
1211H
Road Repair in Treeland
*special problem
,
binary search
,
dp
,
trees
3100
x30
1346H
Game with Segments
*special problem
,
data structures
,
games
2700
x31
1533J
Pawns
*special problem
x32
1346I
Pac-Man 2.0
*special problem
,
dp
2900
x32
1297H
Paint the String
*special problem
,
dp
,
strings
x33
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x34
1170H
Longest Saw
*special problem
,
constructive algorithms
x34
683J
The Hero with Bombs
*special problem
3000
x34
345E
Black Cat Rush
*special problem
2700
x34
1533I
Excursions
*special problem
,
constructive algorithms
,
dfs and similar
,
flows
,
graph matchings
,
graphs
x35
345F
Superstitions Inspection
*special problem
2700
x35
1488H
Build From Suffixes
*special problem
,
combinatorics
,
data structures
2800
x36
530I
Different variables
*special problem
2500
x36
661G
Hungarian Notation
*special problem
2200
x39
1571I
Physical Examination
*special problem
,
binary search
,
data structures
3200
x42
661H
Rotate Matrix
*special problem
2400
x42
345G
Suffix Subgroup
*special problem
,
strings
2200
x43
162G
Non-decimal sum
*special problem
2000
x43
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x44
1192A
Building Skyscrapers
*special problem
x49
72B
INI-file
*special problem
,
implementation
2200
x51
1211G
King's Path
*special problem
,
math
,
trees
2500
x52
1571G
A Battle Against a Dragon
*special problem
,
data structures
,
dp
2500
x53
1431H
Rogue-like Game
*special problem
,
brute force
,
greedy
,
two pointers
2600
x53
153E
Euclidean Distance
*special problem
2100
x54
72D
Perse-script
*special problem
,
expression parsing
2300
x54
1297G
M-numbers
*special problem
,
dp
,
math
x56
1275E3
Контрольная сумма
*special problem
x56
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x56
1170G
Graph Decomposition
*special problem
,
graphs
x57
162I
Truncatable primes
*special problem
2000
x60
153D
Date Change
*special problem
2000
x64
64I
Sort the Table
*special problem
,
sortings
2400
x65
661E
Divisibility Check
*special problem
2000
x67
1533H
Submatrices
*special problem
,
bitmasks
,
data structures
,
dp
x68
162J
Brackets
*special problem
1800
x68
162H
Alternating case
*special problem
1800
x68
345D
Chain Letter
*special problem
,
dfs and similar
,
graphs
2200
x69
1533G
Biome Map
*special problem
,
constructive algorithms
,
dfs and similar
,
graphs
x73
153C
Caesar Cipher
*special problem
2200
x75
1387C
Viruses
*special problem
,
dp
,
shortest paths
,
string suffix structures
2900
x76
774F
Pens And Days Of Week
*special problem
,
binary search
,
number theory
2700
x82
683H
Exchange of Books
*special problem
1900
x82
774I
Composing Of String
*special problem
,
dp
2300
x83
470G
Hamming Distance
*special problem
2300
x84
290F
Greedy Petya
*special problem
,
dfs and similar
,
graphs
,
greedy
2800
x85
1402B
Roads
*special problem
,
geometry
,
sortings
2900
x88
530G
Levenshtein distance
*special problem
2100
x88
530F
Jumping frogs
*special problem
2100
x88
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x89
470F
Pairwise Sums
*special problem
2300
x90
72F
Oil
*special problem
,
greedy
,
math
1900
x90
1488G
Painting Numbers
*special problem
,
data structures
,
greedy
,
number theory
2500
x91
1275F
Шардирование постов
*special problem
,
binary search
,
interactive
x91
409I
Feed the Golorp
*special problem
2400
x92
64H
Table Bowling
*special problem
,
sortings
2300
x92
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x95
64G
Path Canonization
*special problem
2200
x97
1170F
Wheels
*special problem
,
binary search
,
greedy
x100
1297F
Movie Fan
*special problem
,
data structures
,
greedy
,
implementation
,
sortings
x101
1211F
kotlinkotlinkotlinkotlin...
*special problem
,
graphs
,
implementation
,
strings
2300
x103
661F
Primes in Interval
*special problem
1900
x110
130J
Date calculation
*special problem
1800
x110
1431G
Number Deletion Game
*special problem
,
dp
,
games
,
greedy
2100
x111
345C
Counting Fridays
*special problem
2000
x112
530H
Points in triangle
*special problem
,
geometry
2100
x113
345B
Triskaidekaphobia
*special problem
2100
x113
774G
Perfectionist Arkadiy
*special problem
,
number theory
2700
x115
100F
Polynom
*special problem
,
implementation
1800
x115
661D
Maximal Difference
*special problem
2100
x116
1356D2
Quantum Classification - 2
*special problem
x118
1346G
Two IP Cameras
*special problem
,
math
,
number theory
2300
x119
661C
Array Sum
*special problem
2000
x119
683G
The Fraction
*special problem
1900
x121
1571F
Kotlinforces
*special problem
,
constructive algorithms
,
dp
2000
x122
1356D1
Quantum Classification - 1
*special problem
x128
72E
Ali goes shopping
*special problem
,
brute force
,
strings
1800
x128
153B
Binary notation
*special problem
1800
x129
1275E2
Контрольная сумма
*special problem
x130
130I
Array sorting
*special problem
,
sortings
2300
x130
1488F
Dogecoin
*special problem
,
*special problem
,
binary search
,
data structures
2300
x131
470D
Caesar Cipher
*special problem
1900
x135
683F
Reformat the String
*special problem
1800
x136
1431F
Neural Network Problem
*special problem
,
binary search
,
greedy
2100
x138
162F
Factorial zeros
*special problem
1800
x141
100E
Lamps in a Line
*special problem
,
math
1600
x142
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