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Before contest
Codeforces Round 986 (Div. 2)
09:44:52
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→ Filter Problems
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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Problems
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Status
Standings
Custom test
Problems
#
Name
149A
Business trip
greedy
,
implementation
,
sortings
900
x40009
148B
Escape
implementation
,
math
1500
x5503
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x93536
147A
Punctuation
implementation
,
strings
1300
x3651
146B
Lucky Mask
brute force
,
implementation
1300
x4401
146A
Lucky Ticket
implementation
800
x15152
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x243
145A
Lucky Conversion
greedy
,
implementation
1200
x7159
144C
Anagram Search
implementation
,
strings
1500
x4014
144B
Meeting
implementation
1300
x5280
144A
Arrival of the General
implementation
800
x96991
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4993
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2218
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x83887
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1683
139B
Wallpaper
implementation
,
math
1600
x1309
139A
Petr and Book
implementation
1000
x31444
138A
Literature Lesson
implementation
1600
x2395
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1220
137A
Postcards and photos
implementation
900
x7206
136B
Ternary Logic
implementation
,
math
1100
x4876
136A
Presents
implementation
800
x118836
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x301
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7644
134A
Average Numbers
brute force
,
implementation
1200
x3994
133B
Unary
implementation
1200
x8820
133A
HQ9+
implementation
900
x106249
132B
Piet
implementation
2100
x663
132A
Turing Tape
implementation
1300
x2780
131B
Opposites Attract
implementation
,
math
1200
x7051
131A
cAPS lOCK
implementation
,
strings
1000
x86285
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x531
130A
Hexagonal numbers
*special problem
,
implementation
900
x1627
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12312
129A
Cookies
implementation
900
x22829
128D
Numbers
constructive algorithms
,
implementation
2000
x1145
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2598
127B
Canvas Frames
implementation
1000
x8866
125B
Simple XML
implementation
1000
x2936
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3945
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3634
122B
Lucky Substring
brute force
,
implementation
1000
x12365
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x277
121A
Lucky Sum
implementation
1100
x9264
120G
Boom
implementation
1800
x690
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3676
120B
Quiz League
implementation
1100
x3437
120A
Elevator
brute force
,
implementation
,
math
1000
x4630
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1079
119A
Epic Game
implementation
800
x27490
118B
Present from Lena
constructive algorithms
,
implementation
1000
x30165
118A
String Task
implementation
,
strings
1000
x194356
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x349
117A
Elevator
implementation
,
math
1300
x2023
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13778
116A
Tram
implementation
800
x143654
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x119
113A
Grammar Lessons
implementation
,
strings
1600
x2303
112B
Petya and Square
implementation
,
math
1200
x4164
112A
Petya and Strings
implementation
,
strings
800
x227698
110A
Nearly Lucky Number
implementation
800
x156965
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x17732
108A
Palindromic Times
implementation
,
strings
1000
x9394
106D
Treasure Island
brute force
,
implementation
1700
x1356
106B
Choosing Laptop
brute force
,
implementation
1000
x6116
106A
Card Game
implementation
1000
x7630
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x139
105C
Item World
brute force
,
implementation
,
sortings
2200
x344
105A
Transmigration
implementation
1700
x1844
104A
Blackjack
implementation
800
x15449
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x6007
102B
Sum of Digits
implementation
1000
x27022
101C
Vectors
implementation
,
math
2000
x703
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x79
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x124
100F
Polynom
*special problem
,
implementation
1800
x135
100C
A+B
*special problem
,
implementation
1400
x535
100B
Friendly Numbers
*special problem
,
implementation
1500
x543
100A
Carpeting the Room
*special problem
,
implementation
1100
x930
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2972
98B
Help King
implementation
,
probabilities
,
trees
2200
x128
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1216
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x248
97A
Domino
brute force
,
implementation
2400
x266
96A
Football
implementation
,
strings
900
x160095
95A
Hockey
implementation
,
strings
1600
x1678
94B
Friends
graphs
,
implementation
,
math
1300
x4692
94A
Restoring Password
implementation
,
strings
900
x10612
93C
Azembler
brute force
,
implementation
2500
x424
93A
Frames
implementation
1700
x1963
92A
Chips
implementation
,
math
800
x18926
90B
African Crossword
implementation
,
strings
1100
x5333
89C
Chip Play
brute force
,
data structures
,
implementation
2300
x623
89B
Widget Library
dp
,
expression parsing
,
graphs
,
implementation
2300
x525
88B
Keyboard
implementation
1500
x4703
88A
Chord
brute force
,
implementation
1200
x3835
87D
Beautiful Road
dfs and similar
,
dp
,
dsu
,
graphs
,
implementation
,
sortings
,
trees
2300
x902
87B
Vasya and Types
implementation
,
strings
1800
x1155
87A
Trains
implementation
,
math
1500
x5399
86D
Powerful array
data structures
,
implementation
,
math
,
two pointers
2200
x13880
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