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Rayan
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Before contest
Codeforces Round 995 (Div. 3)
22:46:01
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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
72B
INI-file
*special problem
,
implementation
2200
x108
72A
Goshtasp, Vishtasp and Eidi
*special problem
,
greedy
,
math
1800
x187
71E
Nuclear Fusion
bitmasks
,
dp
2200
x751
71D
Solitaire
brute force
,
implementation
2200
x657
71C
Round Table Knights
dp
,
math
,
number theory
1600
x6604
71B
Progress Bar
implementation
,
math
1300
x4599
71A
Way Too Long Words
strings
800
x398191
70E
Information Reform
dp
,
implementation
,
trees
2700
x505
70D
Professor's task
data structures
,
geometry
2700
x1008
70C
Lucky Tickets
binary search
,
data structures
,
sortings
,
two pointers
2200
x582
70B
Text Messaging
expression parsing
,
greedy
,
strings
1600
x1785
70A
Cookies
math
1300
x3308
69E
Subsegments
data structures
,
implementation
1800
x4446
69D
Dot
dp
,
games
1900
x1015
69C
Game
implementation
2000
x594
69B
Bets
greedy
,
implementation
1200
x3292
69A
Young Physicist
implementation
,
math
1000
x170255
68E
Contact
geometry
2900
x72
68D
Half-decay tree
data structures
,
divide and conquer
,
dp
,
math
,
probabilities
2500
x477
68C
Synchrophasotron
brute force
2200
x311
68B
Energy exchange
binary search
1600
x4720
68A
Irrational problem
implementation
,
number theory
1100
x4980
67E
Save the City!
geometry
2500
x318
67D
Optical Experiment
binary search
,
data structures
,
dp
1900
x1501
67C
Sequence of Balls
dp
2600
x689
67B
Restoration of the Permutation
greedy
1800
x780
67A
Partial Teacher
dp
,
graphs
,
greedy
,
implementation
1800
x2139
66E
Petya and Post
data structures
,
dp
2000
x766
66D
Petya and His Friends
constructive algorithms
,
math
,
number theory
1700
x3199
66C
Petya and File System
data structures
,
implementation
1800
x1082
66B
Petya and Countryside
brute force
,
implementation
1100
x20802
66A
Petya and Java
implementation
,
strings
1300
x6472
65E
Harry Potter and Moving Staircases
dfs and similar
,
implementation
2900
x94
65D
Harry Potter and the Sorting Hat
brute force
,
dfs and similar
,
hashing
2200
x433
65C
Harry Potter and the Golden Snitch
binary search
,
geometry
2100
x789
65B
Harry Potter and the History of Magic
brute force
,
greedy
,
implementation
1700
x1393
65A
Harry Potter and Three Spells
implementation
,
math
1800
x1828
64I
Sort the Table
*special problem
,
sortings
2400
x90
64H
Table Bowling
*special problem
,
sortings
2300
x116
64G
Path Canonization
*special problem
2200
x122
64F
Domain
*special problem
,
expression parsing
2000
x182
64E
Prime Segment
*special problem
,
brute force
,
math
,
number theory
1800
x245
64D
Presents
*special problem
,
greedy
1800
x290
64C
Table
*special problem
,
greedy
,
implementation
,
math
1600
x340
64B
Expression
*special problem
,
expression parsing
1500
x1022
64A
Factorial
*special problem
,
implementation
1300
x3184
63E
Sweets Game
bitmasks
,
dfs and similar
,
dp
,
games
,
implementation
2000
x768
63D
Dividing Island
constructive algorithms
1900
x1270
63C
Bulls and Cows
brute force
,
implementation
1700
x1745
63B
Settlers' Training
implementation
1200
x4859
63A
Sinking Ship
implementation
,
sortings
,
strings
900
x11728
62E
World Evil
dp
,
flows
2700
x236
62D
Wormhouse
dfs and similar
,
graphs
2300
x375
62C
Inquisition
geometry
,
implementation
,
sortings
2300
x253
62B
Tyndex.Brome
binary search
,
implementation
1800
x1296
62A
A Student's Dream
greedy
,
math
1300
x3469
61E
Enemy is weak
data structures
,
trees
1900
x11530
61D
Eternal Victory
dfs and similar
,
graphs
,
greedy
,
shortest paths
,
trees
1800
x6653
61C
Capture Valerian
math
2000
x722
61B
Hard Work
strings
1300
x3893
61A
Ultra-Fast Mathematician
implementation
800
x114184
60E
Mushroom Gnomes
math
,
matrices
2600
x328
60D
Savior
brute force
,
dsu
,
math
2500
x459
60C
Mushroom Strife
brute force
,
dfs and similar
2100
x569
60B
Serial Time!
dfs and similar
,
dsu
1400
x4709
60A
Where Are My Flakes?
implementation
,
two pointers
1300
x3674
59E
Shortest Path
graphs
,
shortest paths
2000
x3602
59D
Team Arrangement
constructive algorithms
,
greedy
,
implementation
2000
x639
59C
Title
expression parsing
1600
x2118
59B
Fortune Telling
implementation
,
number theory
1200
x6995
59A
Word
implementation
,
strings
800
x182438
58E
Expression
dp
2400
x395
58D
Calendar
greedy
,
strings
2000
x736
58C
Trees
brute force
1800
x2047
58B
Coins
greedy
1300
x12307
58A
Chat room
greedy
,
strings
1000
x133148
57E
Chess
math
,
shortest paths
3000
x264
57D
Journey
dp
,
math
2500
x343
57C
Array
combinatorics
,
math
1900
x2730
57B
Martian Architecture
implementation
1600
x1024
57A
Square Earth?
dfs and similar
,
greedy
,
implementation
1300
x2936
56E
Domino Principle
binary search
,
data structures
,
sortings
2200
x2435
56D
Changing a String
dp
2100
x1657
56C
Corporation Mail
data structures
,
expression parsing
,
implementation
1700
x1173
56B
Spoilt Permutation
implementation
1300
x3748
56A
Bar
implementation
1000
x8760
55E
Very simple problem
geometry
,
two pointers
2500
x709
55D
Beautiful numbers
dp
,
number theory
2500
x3967
55C
Pie or die
games
1900
x1662
55B
Smallest number
brute force
1600
x2898
55A
Flea travel
implementation
,
math
1200
x3497
54E
Vacuum Сleaner
geometry
2700
x194
54D
Writing a Song
brute force
,
dp
,
strings
2100
x551
54C
First Digit Law
dp
,
math
,
probabilities
2000
x1356
54B
Cutting Jigsaw Puzzle
hashing
,
implementation
1800
x778
54A
Presents
implementation
1300
x2094
53E
Dead Ends
bitmasks
,
dp
2500
x1018
53D
Physical Education
sortings
1500
x2051
53C
Little Frog
constructive algorithms
1200
x6547
53B
Blog Photo
binary search
,
implementation
1700
x1417
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