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Before contest
Codeforces Round 987 (Div. 2)
11:11:48
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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
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Status
Standings
Custom test
Problems
#
Name
166C
Median
greedy
,
math
,
sortings
1500
x6522
166B
Polygons
geometry
,
sortings
2100
x2449
166A
Rank List
binary search
,
implementation
,
sortings
1100
x17841
165E
Compatible Numbers
bitmasks
,
brute force
,
dfs and similar
,
dp
2200
x6934
165D
Beard Graph
data structures
,
dsu
,
trees
2100
x1667
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12352
165B
Burning Midnight Oil
binary search
,
implementation
1500
x18163
165A
Supercentral Point
implementation
1000
x23671
164E
Polycarpus and Tasks
3100
x67
164D
Minimum Diameter
binary search
,
brute force
3100
x244
164C
Machine Programming
flows
,
graphs
2400
x901
164B
Ancient Berland Hieroglyphs
two pointers
2000
x469
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x1017
163E
e-Government
data structures
,
dfs and similar
,
dp
,
strings
,
trees
2800
x1730
163D
Large Refrigerator
brute force
2900
x505
163C
Conveyor
sortings
,
two pointers
2100
x543
163B
Lemmings
binary search
2000
x1066
163A
Substring and Subsequence
dp
1700
x2715
162J
Brackets
*special problem
1800
x96
162I
Truncatable primes
*special problem
2000
x77
162H
Alternating case
*special problem
1800
x220
162G
Non-decimal sum
*special problem
2000
x65
162F
Factorial zeros
*special problem
1800
x202
162E
HQ9+
*special problem
1800
x178
162D
Remove digits
*special problem
1900
x228
162C
Prime factorization
*special problem
1800
x808
162B
Binary notation
*special problem
1800
x313
162A
Pentagonal numbers
*special problem
,
implementation
1100
x805
161E
Polycarpus the Safecracker
brute force
,
dp
2500
x468
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x15101
161C
Abracadabra
divide and conquer
2400
x652
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1959
161A
Dress'em in Vests!
binary search
,
brute force
,
greedy
,
two pointers
1300
x4918
160E
Buses and People
binary search
,
data structures
,
sortings
2400
x589
160D
Edges in MST
dfs and similar
,
dsu
,
graphs
,
sortings
2300
x2784
160C
Find Pair
implementation
,
math
,
sortings
1700
x3458
160B
Unlucky Ticket
greedy
,
sortings
1100
x14107
160A
Twins
greedy
,
sortings
900
x119093
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x1001
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4323
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x2999
159B
Matchmaker
*special problem
,
greedy
,
sortings
1100
x3807
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2485
158E
Phone Talks
*special problem
,
dp
,
sortings
1900
x1463
158D
Ice Sculptures
*special problem
,
brute force
,
number theory
1300
x6250
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9249
158B
Taxi
*special problem
,
greedy
,
implementation
1100
x87696
158A
Next Round
*special problem
,
implementation
800
x252843
157B
Trace
geometry
,
sortings
1000
x13243
157A
Game Outcome
brute force
800
x7618
156E
Mrs. Hudson's Pancakes
brute force
,
dp
3000
x163
156D
Clues
combinatorics
,
graphs
2500
x1593
156C
Cipher
combinatorics
,
dp
2000
x2427
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2234
156A
Message
brute force
1700
x3045
155B
Combination
greedy
,
sortings
1100
x10330
155A
I_love_\%username\%
brute force
800
x76432
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
x4753
154A
Hometask
greedy
1600
x4064
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
x6744
152A
Marks
implementation
900
x16863
151B
Phone Numbers
implementation
,
strings
1200
x6389
151A
Soft Drinking
implementation
,
math
800
x74461
150E
Freezing with Style
binary search
,
data structures
,
divide and conquer
,
trees
3000
x860
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
x4210
150A
Win or Freeze
games
,
math
,
number theory
1400
x7855
149E
Martian Strings
string suffix structures
,
strings
2300
x2288
149D
Coloring Brackets
dp
1900
x3886
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5396
149B
Martian Clock
implementation
1600
x2262
149A
Business trip
greedy
,
implementation
,
sortings
900
x40078
148E
Porcelain
dp
1900
x4072
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7323
148C
Terse princess
constructive algorithms
,
greedy
1700
x3144
148B
Escape
implementation
,
math
1500
x5508
148A
Insomnia cure
constructive algorithms
,
implementation
,
math
800
x93694
147B
Smile House
binary search
,
graphs
,
matrices
2500
x787
147A
Punctuation
implementation
,
strings
1300
x3655
146B
Lucky Mask
brute force
,
implementation
1300
x4405
146A
Lucky Ticket
implementation
800
x15160
145E
Lucky Queries
data structures
2400
x3192
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
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