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Before contest
Codeforces Round 987 (Div. 2)
32:30:00
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Difficulty:
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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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Status
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Custom test
Problems
#
Name
156A
Message
brute force
1700
x3045
155B
Combination
greedy
,
sortings
1100
x10330
155A
I_love_\%username\%
brute force
800
x76404
154E
Martian Colony
geometry
3000
x97
154D
Flatland Fencing
games
,
math
2400
x432
154C
Double Profiles
graphs
,
hashing
,
sortings
2300
x2861
154B
Colliders
math
,
number theory
1600
x4750
154A
Hometask
greedy
1600
x4063
153E
Euclidean Distance
*special problem
2100
x80
153D
Date Change
*special problem
2000
x83
153C
Caesar Cipher
*special problem
2200
x391
153B
Binary notation
*special problem
1800
x157
153A
A + B
*special problem
1600
x822
152E
Garden
bitmasks
,
dp
,
graphs
,
trees
2500
x487
152D
Frames
brute force
2600
x244
152C
Pocket Book
combinatorics
1400
x10663
152B
Steps
binary search
,
implementation
1300
x6743
152A
Marks
implementation
900
x16861
151B
Phone Numbers
implementation
,
strings
1200
x6389
151A
Soft Drinking
implementation
,
math
800
x74433
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x857
150D
Mission Impassable
dp
,
strings
2600
x626
150C
Smart Cheater
data structures
,
math
,
probabilities
2200
x643
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4209
150A
Win or Freeze
games
,
math
,
number theory
1400
x7853
149E
Martian Strings
string suffix structures
,
strings
2300
x2288
149D
Coloring Brackets
dp
1900
x3886
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5395
149B
Martian Clock
implementation
1600
x2262
149A
Business trip
greedy
,
implementation
,
sortings
900
x40071
148E
Porcelain
dp
1900
x4070
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7319
148C
Terse princess
constructive algorithms
,
greedy
1700
x3144
148B
Escape
implementation
,
math
1500
x5508
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x93665
147B
Smile House
binary search
,
graphs
,
matrices
2500
x787
147A
Punctuation
implementation
,
strings
1300
x3652
146B
Lucky Mask
brute force
,
implementation
1300
x4405
146A
Lucky Ticket
implementation
800
x15159
145E
Lucky Queries
data structures
2400
x3190
145D
Lucky Pair
combinatorics
,
data structures
,
implementation
2900
x243
145C
Lucky Subsequence
combinatorics
,
dp
,
math
2100
x1911
145B
Lucky Number 2
constructive algorithms
1800
x2220
145A
Lucky Conversion
greedy
,
implementation
1200
x7162
144E
Competition
data structures
,
greedy
2200
x590
144D
Missile Silos
data structures
,
dfs and similar
,
graphs
,
shortest paths
1900
x4022
144C
Anagram Search
implementation
,
strings
1500
x4014
144B
Meeting
implementation
1300
x5281
144A
Arrival of the General
implementation
800
x97129
143B
Help Kingdom of Far Far Away 2
implementation
,
strings
1200
x4994
143A
Help Vasilisa the Wise 2
brute force
,
math
1000
x13927
142E
Help Greg the Dwarf 2
geometry
3000
x80
142D
Help Shrek and Donkey 2
games
2600
x347
142C
Help Caretaker
brute force
,
dp
2300
x926
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2219
142A
Help Farmer
brute force
,
math
1600
x2625
141E
Clearing Up
constructive algorithms
,
dp
,
dsu
,
graphs
2300
x1096
141D
Take-off Ramps
graphs
,
shortest paths
2300
x899
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2469
141B
Hopscotch
geometry
,
math
1400
x5402
141A
Amusing Joke
implementation
,
sortings
,
strings
800
x84001
140F
New Year Snowflake
geometry
,
sortings
2600
x370
140E
New Year Garland
combinatorics
,
dp
2600
x944
140D
New Year Contest
greedy
,
sortings
1800
x2214
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4382
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1683
140A
New Year Table
geometry
,
math
1700
x4151
139B
Wallpaper
implementation
,
math
1600
x1310
139A
Petr and Book
implementation
1000
x31480
138E
Hellish Constraints
brute force
,
dp
,
two pointers
2900
x174
138D
World of Darkraft
dp
,
games
2500
x496
138C
Mushroom Gnomes - 2
binary search
,
data structures
,
probabilities
,
sortings
2200
x871
138B
Digits Permutations
greedy
1900
x1038
138A
Literature Lesson
implementation
1600
x2395
137E
Last Chance
data structures
,
implementation
,
strings
2000
x1220
137D
Palindromes
dp
,
strings
1900
x1521
137C
History
sortings
1500
x7226
137B
Permutation
greedy
1000
x13751
137A
Postcards and photos
implementation
900
x7211
136B
Ternary Logic
implementation
,
math
1100
x4877
136A
Presents
implementation
800
x119058
135E
Weak Subsequence
combinatorics
3000
x306
135D
Cycle
brute force
,
dfs and similar
,
implementation
2500
x301
135C
Zero-One
constructive algorithms
,
games
,
greedy
1900
x1348
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2356
135A
Replacement
greedy
,
implementation
,
sortings
1300
x7646
134C
Swaps
constructive algorithms
,
graphs
,
greedy
2200
x474
134B
Pairs of Numbers
brute force
,
dfs and similar
,
math
,
number theory
1900
x2048
134A
Average Numbers
brute force
,
implementation
1200
x3998
133B
Unary
implementation
1200
x8822
133A
HQ9+
implementation
900
x106373
132E
Bits of merry old England
flows
,
graphs
2700
x533
132D
Constants in the language of Shakespeare
constructive algorithms
,
dp
,
greedy
2100
x618
132C
Logo Turtle
dp
1800
x2352
132B
Piet
implementation
2100
x663
132A
Turing Tape
implementation
1300
x2781
131F
Present to Mom
binary search
,
two pointers
2000
x649
131E
Yet Another Task with Queens
sortings
1700
x1856
131D
Subway
dfs and similar
,
graphs
1600
x4698
131C
The World is a Theatre
combinatorics
,
math
1400
x11193
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