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Before contest
Codeforces Round 951 (Div. 2)
43:47:19
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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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Problems
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Status
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Custom test
Problems
#
Name
119C
Education Reform
dp
2000
x870
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1068
119A
Epic Game
implementation
800
x26972
118E
Bertown roads
dfs and similar
,
graphs
2000
x6039
118D
Caesar's Legions
dp
1700
x16817
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2528
118B
Present from Lena
constructive algorithms
,
implementation
1000
x28651
118A
String Task
implementation
,
strings
1000
x182967
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x314
117D
Not Quick Transformation
divide and conquer
,
math
2500
x331
117C
Cycle
dfs and similar
,
graphs
2000
x2555
117B
Very Interesting Game
brute force
,
number theory
1800
x1539
117A
Elevator
implementation
,
math
1300
x1980
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13472
116A
Tram
implementation
800
x133561
115E
Linear Kingdom Races
data structures
,
dp
2400
x1387
115D
Unambiguous Arithmetic Expression
dp
,
expression parsing
2600
x375
115C
Plumber
math
2200
x589
115B
Lawnmower
greedy
,
sortings
1500
x2434
115A
Party
dfs and similar
,
graphs
,
trees
900
x33057
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3550
114A
Cifera
math
1000
x13893
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x117
113D
Museum
math
,
matrices
,
probabilities
2700
x655
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1204
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2737
113A
Grammar Lessons
implementation
,
strings
1600
x2241
112B
Petya and Square
implementation
,
math
1200
x4078
112A
Petya and Strings
implementation
,
strings
800
x211581
111E
Petya and Rectangle
2900
x65
111D
Petya and Coloring
combinatorics
,
dp
2300
x720
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1280
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3559
111A
Petya and Inequiations
greedy
1400
x4647
110B
Lucky String
constructive algorithms
,
strings
1100
x9984
110A
Nearly Lucky Number
implementation
800
x144392
109E
Lucky Interval
brute force
,
math
2700
x99
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x617
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3203
109B
Lucky Probability
brute force
,
probabilities
1900
x1325
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x16745
108B
Datatypes
math
,
sortings
1400
x2422
108A
Palindromic Times
implementation
,
strings
1000
x9212
107E
Darts
geometry
,
probabilities
2700
x128
107D
Crime Management
dp
,
graphs
,
matrices
2400
x401
107C
Arrangement
bitmasks
,
dp
2400
x363
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3302
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4963
106E
Space Rescuers
geometry
,
ternary search
2100
x839
106D
Treasure Island
brute force
,
implementation
1700
x1295
106C
Buns
dp
1700
x5744
106B
Choosing Laptop
brute force
,
implementation
1000
x5955
106A
Card Game
implementation
1000
x7442
105E
Lift and Throw
brute force
2500
x183
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x136
105C
Item World
brute force
,
implementation
,
sortings
2200
x271
105B
Dark Assembly
brute force
,
probabilities
1800
x798
105A
Transmigration
implementation
1700
x1810
104A
Blackjack
implementation
800
x14913
103E
Buying Sets
flows
,
graph matchings
2900
x828
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x1993
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x938
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8565
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5877
102B
Sum of Digits
implementation
1000
x24848
102A
Clothes
brute force
1200
x2929
101E
Candies and Stones
divide and conquer
,
dp
2500
x478
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x672
101C
Vectors
implementation
,
math
2000
x687
101B
Buses
binary search
,
data structures
,
dp
1700
x2498
101A
Homework
greedy
1200
x3718
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x61
100I
Rotation
*special problem
,
geometry
,
math
1500
x342
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
100E
Lamps in a Line
*special problem
,
math
1600
x267
100D
World of Mouth
*special problem
,
strings
1500
x298
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
x2902
99A
Help Far Away Kingdom
strings
800
x6535
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x454
98D
Help Monks
constructive algorithms
2500
x180
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x301
98B
Help King
implementation
,
probabilities
,
trees
2200
x116
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1171
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x371
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x242
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x300
97B
Superset
constructive algorithms
,
divide and conquer
2300
x806
97A
Domino
brute force
,
implementation
2400
x254
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x14593
96A
Football
implementation
,
strings
900
x150590
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1403
95D
Horse Races
dp
,
math
2500
x417
95C
Volleyball
shortest paths
1900
x2704
95B
Lucky Numbers
dp
,
greedy
1800
x1181
95A
Hockey
implementation
,
strings
1600
x1645
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