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Before contest
Codeforces Round 953 (Div. 2)
09:47:59
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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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Custom test
Problems
#
Name
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x694
123D
String
string suffix structures
2300
x1185
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x590
123B
Squares
math
1800
x1099
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3531
122B
Lucky Substring
brute force
,
implementation
1000
x12071
122A
Lucky Division
brute force
,
number theory
1000
x117792
121E
Lucky Array
data structures
2400
x1660
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x273
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1273
121B
Lucky Transformation
strings
1500
x2538
121A
Lucky Sum
implementation
1100
x8886
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x910
120I
Luck is in Numbers
greedy
2200
x303
120H
Brevity is Soul of Wit
graph matchings
1800
x1358
120G
Boom
implementation
1800
x683
120F
Spiders
dp
,
greedy
,
trees
1400
x3523
120E
Put Knight!
games
,
math
1400
x2653
120D
Three Sons
brute force
1400
x1906
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3595
120B
Quiz League
implementation
1100
x3362
120A
Elevator
brute force
,
implementation
,
math
1000
x4513
119E
Alternative Reality
geometry
2400
x94
119D
String Transformation
hashing
,
strings
2500
x479
119C
Education Reform
dp
2000
x870
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1069
119A
Epic Game
implementation
800
x27019
118E
Bertown roads
dfs and similar
,
graphs
2000
x6238
118D
Caesar's Legions
dp
1700
x16875
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2532
118B
Present from Lena
constructive algorithms
,
implementation
1000
x28830
118A
String Task
implementation
,
strings
1000
x183787
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x316
117D
Not Quick Transformation
divide and conquer
,
math
2500
x331
117C
Cycle
dfs and similar
,
graphs
2000
x2558
117B
Very Interesting Game
brute force
,
number theory
1800
x1541
117A
Elevator
implementation
,
math
1300
x1981
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13492
116A
Tram
implementation
800
x134225
115E
Linear Kingdom Races
data structures
,
dp
2400
x1392
115D
Unambiguous Arithmetic Expression
dp
,
expression parsing
2600
x376
115C
Plumber
math
2200
x589
115B
Lawnmower
greedy
,
sortings
1500
x2437
115A
Party
dfs and similar
,
graphs
,
trees
900
x33168
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3553
114A
Cifera
math
1000
x13918
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
x2744
113A
Grammar Lessons
implementation
,
strings
1600
x2243
112B
Petya and Square
implementation
,
math
1200
x4084
112A
Petya and Strings
implementation
,
strings
800
x212675
111E
Petya and Rectangle
2900
x65
111D
Petya and Coloring
combinatorics
,
dp
2300
x720
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1303
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3566
111A
Petya and Inequiations
greedy
1400
x4656
110B
Lucky String
constructive algorithms
,
strings
1100
x10000
110A
Nearly Lucky Number
implementation
800
x145283
109E
Lucky Interval
brute force
,
math
2700
x100
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x617
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3209
109B
Lucky Probability
brute force
,
probabilities
1900
x1329
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x16820
108B
Datatypes
math
,
sortings
1400
x2424
108A
Palindromic Times
implementation
,
strings
1000
x9227
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
x3310
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x4974
106E
Space Rescuers
geometry
,
ternary search
2100
x839
106D
Treasure Island
brute force
,
implementation
1700
x1295
106C
Buns
dp
1700
x5762
106B
Choosing Laptop
brute force
,
implementation
1000
x5965
106A
Card Game
implementation
1000
x7469
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
x799
105A
Transmigration
implementation
1700
x1811
104A
Blackjack
implementation
800
x14993
103E
Buying Sets
flows
,
graph matchings
2900
x828
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x1999
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x939
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8576
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5891
102B
Sum of Digits
implementation
1000
x24971
102A
Clothes
brute force
1200
x2936
101E
Candies and Stones
divide and conquer
,
dp
2500
x480
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x672
101C
Vectors
implementation
,
math
2000
x688
101B
Buses
binary search
,
data structures
,
dp
1700
x2511
101A
Homework
greedy
1200
x3721
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
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