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Before contest
Codeforces Round 941 (Div. 1)
26:04:12
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*has extra registration
Before contest
Codeforces Round 941 (Div. 2)
26:04:12
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math
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
1488J
Flower Shop
*special problem
,
data structures
,
fft
,
math
3100
x31
1578G
Game of Chance
math
,
probabilities
3500
x32
1425C
Captain of Knights
math
3100
x37
1403C
Chess Rush
*special problem
,
combinatorics
,
dp
,
implementation
,
math
3200
x42
1912I
Innovative Washing Machine
geometry
,
math
,
two pointers
3300
x54
1280F
Intergalactic Sliding Puzzle
combinatorics
,
constructive algorithms
,
math
3400
x56
1666H
Heroes of Might
math
3500
x60
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x60
1776N
Count Permutations
math
3500
x64
1776K
Uniform Chemistry
dp
,
math
3200
x64
1949H
Division Avoidance
greedy
,
math
x65
1297G
M-numbers
*special problem
,
dp
,
math
x65
1211G
King's Path
*special problem
,
math
,
trees
2500
x66
1310F
Bad Cryptography
math
,
number theory
3400
x67
865F
Egg Roulette
bitmasks
,
brute force
,
divide and conquer
,
math
,
meet-in-the-middle
3300
x67
1654H
Three Minimums
combinatorics
,
constructive algorithms
,
divide and conquer
,
dp
,
fft
,
math
3500
x69
737F
Dirty plates
constructive algorithms
,
math
3300
x69
1909I
Short Permutation Problem
combinatorics
,
dp
,
fft
,
math
1900
x73
1704H2
Game of AI (hard version)
combinatorics
,
fft
,
math
3500
x75
1761F2
Anti-median (Hard Version)
combinatorics
,
dp
,
math
3500
x76
1375I
Cubic Lattice
geometry
,
math
,
matrices
,
number theory
3500
x76
1949E
Damage per Second
brute force
,
math
x77
1896H1
Cyclic Hamming (Easy Version)
brute force
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x77
1687F
Koishi's Unconscious Permutation
fft
,
math
3500
x77
765G
Math, math everywhere
brute force
,
dp
,
math
,
meet-in-the-middle
,
number theory
3200
x79
1726H
Mainak and the Bleeding Polygon
binary search
,
geometry
,
implementation
,
math
3500
x80
457E
Flow Optimality
constructive algorithms
,
flows
,
math
3000
x81
901E
Cyclic Cipher
fft
,
math
3300
x84
1896H2
Cyclic Hamming (Hard Version)
brute force
,
dp
,
fft
,
math
,
number theory
3500
x85
1677F
Tokitsukaze and Gems
dp
,
math
3500
x85
28E
DravDe saves the world
geometry
,
math
2800
x85
756F
Long number
expression parsing
,
math
,
number theory
3400
x89
1045F
Shady Lady
geometry
,
math
3400
x92
1936E
Yet Yet Another Permutation Problem
divide and conquer
,
fft
,
math
3400
x93
1773J
Jumbled Trees
constructive algorithms
,
math
2900
x95
1704G
Mio and Lucky Array
constructive algorithms
,
fft
,
math
,
strings
3500
x96
128E
Birthday
geometry
,
math
2900
x96
1540E
Tasty Dishes
math
,
matrices
3500
x98
109E
Lucky Interval
brute force
,
math
2700
x98
1266H
Red-Blue Graph
dp
,
graphs
,
math
,
matrices
,
meet-in-the-middle
3400
x99
1381E
Origami
geometry
,
math
,
sortings
3300
x100
1718E
Impressionism
constructive algorithms
,
graphs
,
implementation
,
math
3500
x102
1184D2
Parallel Universes (Hard)
math
,
matrices
3100
x102
1912F
Fugitive Frenzy
math
,
probabilities
3100
x104
1575F
Finding Expected Value
math
2900
x107
1349F2
Slime and Sequences (Hard Version)
dp
,
fft
,
math
3500
x107
269E
String Theory
geometry
,
math
,
strings
3100
x107
1566H
Xor-quiz
constructive algorithms
,
dp
,
interactive
,
math
,
number theory
3200
x110
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x116
72F
Oil
*special problem
,
greedy
,
math
1900
x116
1737F
Ela and Prime GCD
constructive algorithms
,
math
,
number theory
3300
x117
1725D
Deducing Sortability
binary search
,
bitmasks
,
math
2900
x117
1386B
Mixture
*special problem
,
data structures
,
geometry
,
math
,
sortings
2900
x118
446E
DZY Loves Bridges
math
,
matrices
3100
x118
79E
Security System
math
2900
x118
868G
El Toll Caves
math
3300
x119
802F
Marmots (hard)
math
,
probabilities
2800
x120
1552I
Organizing a Music Festival
dfs and similar
,
math
3400
x121
1205F
Beauty of a Permutation
constructive algorithms
,
math
3400
x121
1477F
Nezzar and Chocolate Bars
combinatorics
,
fft
,
math
,
probabilities
3500
x122
913H
Don't Exceed
math
,
probabilities
3400
x123
40D
Interesting Sequence
math
2600
x123
1662E
Round Table
math
x126
1844H
Multiple of Three Cycles
combinatorics
,
data structures
,
dp
,
dsu
,
math
3400
x129
1810H
Last Number
combinatorics
,
math
2900
x129
1580F
Problems for Codeforces
combinatorics
,
fft
,
math
3300
x130
1346G
Two IP Cameras
*special problem
,
math
,
number theory
2300
x130
865G
Flowers and Chocolate
combinatorics
,
math
,
matrices
3300
x130
1666G
Global Warming
geometry
,
math
3100
x133
1209H
Moving Walkways
data structures
,
greedy
,
math
3300
x135
1184A3
Heidi Learns Hashing (Hard)
fft
,
math
,
number theory
3100
x136
859G
Circle of Numbers
math
3000
x144
396E
On Iteration of One Well-Known Function
math
x144
1718F
Burenka, an Array and Queries
data structures
,
math
,
number theory
3300
x145
1361F
Johnny and New Toy
data structures
,
implementation
,
math
3300
x145
549E
Sasha Circle
geometry
,
math
2700
x145
1158E
Strange device
binary search
,
interactive
,
math
,
trees
3400
x147
1299E
So Mean
interactive
,
math
3400
x148
1770G
Koxia and Bracket
divide and conquer
,
fft
,
math
3400
x150
756E
Byteland coins
combinatorics
,
dp
,
math
3200
x150
1696H
Maximum Product?
brute force
,
combinatorics
,
dp
,
greedy
,
implementation
,
math
,
two pointers
3500
x152
1586I
Omkar and Mosaic
combinatorics
,
constructive algorithms
,
math
3500
x156
267C
Berland Traffic
math
,
matrices
2700
x159
1450H2
Multithreading (Hard Version)
combinatorics
,
implementation
,
math
3300
x162
329E
Evil
math
3100
x163
1408I
Bitwise Magic
dp
,
math
3200
x164
1796F
Strange Triples
brute force
,
math
,
number theory
2900
x167
1601F
Two Sorts
binary search
,
dfs and similar
,
math
,
meet-in-the-middle
3400
x167
401E
Olympic Games
math
2500
x167
1236F
Alice and the Cactus
dfs and similar
,
graphs
,
math
,
probabilities
3000
x168
1704H1
Game of AI (easy version)
combinatorics
,
constructive algorithms
,
dp
,
fft
,
math
3200
x170
1054H
Epic Convolution
chinese remainder theorem
,
fft
,
math
,
number theory
3500
x171
1242D
Number Discovery
math
3400
x175
1954F
Unique Strings
combinatorics
,
dp
,
math
3100
x176
86E
Long sequence
brute force
,
math
,
matrices
2700
x178
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x181
1479E
School Clubs
dp
,
fft
,
math
,
number theory
,
probabilities
3500
x182
736E
Chess Championship
constructive algorithms
,
flows
,
greedy
,
math
2900
x182
773F
Test Data Generation
combinatorics
,
divide and conquer
,
dp
,
fft
,
math
,
number theory
3400
x184
1765J
Hero to Zero
graph matchings
,
math
2900
x185
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