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Before contest
Codeforces Round 950 (Div. 3)
44:24:49
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Difficulty:
—
implementation
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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Custom test
Problems
#
Name
145A
Lucky Conversion
greedy
,
implementation
1200
x6967
144C
Anagram Search
implementation
,
strings
1500
x3891
144B
Meeting
implementation
1300
x5066
144A
Arrival of the General
implementation
800
x89927
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4922
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2140
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x78559
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1480
139B
Wallpaper
implementation
,
math
1600
x1275
139A
Petr and Book
implementation
1000
x28990
138A
Literature Lesson
implementation
1600
x2345
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1195
137A
Postcards and photos
implementation
900
x6933
136B
Ternary Logic
implementation
,
math
1100
x4739
136A
Presents
implementation
800
x110255
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x294
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7452
134A
Average Numbers
brute force
,
implementation
1200
x3814
133B
Unary
implementation
1200
x8652
133A
HQ9+
implementation
900
x100795
132B
Piet
implementation
2100
x472
132A
Turing Tape
implementation
1300
x2741
131B
Opposites Attract
implementation
,
math
1200
x6875
131A
cAPS lOCK
implementation
,
strings
1000
x81846
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x517
130A
Hexagonal numbers
*special problem
,
implementation
900
x1526
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x11753
129A
Cookies
implementation
900
x21876
128D
Numbers
constructive algorithms
,
implementation
2000
x1090
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2473
127B
Canvas Frames
implementation
1000
x8248
125B
Simple XML
implementation
1000
x2773
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3772
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3523
122B
Lucky Substring
brute force
,
implementation
1000
x12039
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x273
121A
Lucky Sum
implementation
1100
x8861
120G
Boom
implementation
1800
x681
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3589
120B
Quiz League
implementation
1100
x3344
120A
Elevator
brute force
,
implementation
,
math
1000
x4510
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1068
119A
Epic Game
implementation
800
x26968
118B
Present from Lena
constructive algorithms
,
implementation
1000
x28611
118A
String Task
implementation
,
strings
1000
x182769
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x313
117A
Elevator
implementation
,
math
1300
x1978
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13461
116A
Tram
implementation
800
x133395
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x117
113A
Grammar Lessons
implementation
,
strings
1600
x2241
112B
Petya and Square
implementation
,
math
1200
x4076
112A
Petya and Strings
implementation
,
strings
800
x211296
110A
Nearly Lucky Number
implementation
800
x144193
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x16726
108A
Palindromic Times
implementation
,
strings
1000
x9209
106D
Treasure Island
brute force
,
implementation
1700
x1295
106B
Choosing Laptop
brute force
,
implementation
1000
x5951
106A
Card Game
implementation
1000
x7437
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x136
105C
Item World
brute force
,
implementation
,
sortings
2200
x271
105A
Transmigration
implementation
1700
x1810
104A
Blackjack
implementation
800
x14898
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5877
102B
Sum of Digits
implementation
1000
x24805
101C
Vectors
implementation
,
math
2000
x686
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x75
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x110
100F
Polynom
*special problem
,
implementation
1800
x133
100C
A+B
*special problem
,
implementation
1400
x516
100B
Friendly Numbers
*special problem
,
implementation
1500
x536
100A
Carpeting the Room
*special problem
,
implementation
1100
x894
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2899
98B
Help King
implementation
,
probabilities
,
trees
2200
x115
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1171
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x240
97A
Domino
brute force
,
implementation
2400
x251
96A
Football
implementation
,
strings
900
x150430
95A
Hockey
implementation
,
strings
1600
x1644
94B
Friends
graphs
,
implementation
,
math
1300
x4516
94A
Restoring Password
implementation
,
strings
900
x10186
93C
Azembler
brute force
,
implementation
2500
x411
93A
Frames
implementation
1700
x1913
92A
Chips
implementation
,
math
800
x18279
90B
African Crossword
implementation
,
strings
1100
x5182
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x610
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x511
88B
Keyboard
implementation
1500
x4395
88A
Chord
brute force
,
implementation
1200
x3748
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x853
87B
Vasya and Types
implementation
,
strings
1800
x1117
87A
Trains
implementation
,
math
1500
x5204
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x12664
85D
Sum of Medians
binary search
,
brute force
,
data structures
,
implementation
2300
x1918
85A
Domino
constructive algorithms
,
implementation
1300
x1765
84C
Biathlon
binary search
,
implementation
1700
x1591
82B
Sets
constructive algorithms
,
hashing
,
implementation
1700
x2019
82A
Double Cola
implementation
,
math
1100
x29565
81E
Pairs
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
trees
2700
x329
81B
Sequence Formatting
implementation
,
strings
1700
x1879
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