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Before contest
Codeforces Round 973 (Div. 2)
11:40:53
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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
Standings
Custom test
Problems
#
Name
123B
Squares
math
1800
x1109
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3599
122B
Lucky Substring
brute force
,
implementation
1000
x12292
122A
Lucky Division
brute force
,
number theory
1000
x122460
121E
Lucky Array
data structures
2400
x1715
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x275
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1279
121B
Lucky Transformation
strings
1500
x2568
121A
Lucky Sum
implementation
1100
x9133
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x915
120I
Luck is in Numbers
greedy
2200
x304
120H
Brevity is Soul of Wit
graph matchings
1800
x1384
120G
Boom
implementation
1800
x686
120F
Spiders
dp
,
greedy
,
trees
1400
x3570
120E
Put Knight!
games
,
math
1400
x2720
120D
Three Sons
brute force
1400
x1917
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3656
120B
Quiz League
implementation
1100
x3418
120A
Elevator
brute force
,
implementation
,
math
1000
x4580
119E
Alternative Reality
geometry
2400
x95
119D
String Transformation
hashing
,
strings
2500
x489
119C
Education Reform
dp
2000
x912
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1074
119A
Epic Game
implementation
800
x27324
118E
Bertown roads
dfs and similar
,
graphs
2000
x6518
118D
Caesar's Legions
dp
1700
x17330
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2578
118B
Present from Lena
constructive algorithms
,
implementation
1000
x29768
118A
String Task
implementation
,
strings
1000
x190703
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x323
117D
Not Quick Transformation
divide and conquer
,
math
2500
x334
117C
Cycle
dfs and similar
,
graphs
2000
x2603
117B
Very Interesting Game
brute force
,
number theory
1800
x1601
117A
Elevator
implementation
,
math
1300
x2002
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13700
116A
Tram
implementation
800
x140118
115E
Linear Kingdom Races
data structures
,
dp
2400
x1534
115D
Unambiguous Arithmetic Expression
dp
,
expression parsing
2600
x381
115C
Plumber
math
2200
x595
115B
Lawnmower
greedy
,
sortings
1500
x2585
115A
Party
dfs and similar
,
graphs
,
trees
900
x34310
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3631
114A
Cifera
math
1000
x14083
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x119
113D
Museum
math
,
matrices
,
probabilities
2700
x674
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1232
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2795
113A
Grammar Lessons
implementation
,
strings
1600
x2285
112B
Petya and Square
implementation
,
math
1200
x4132
112A
Petya and Strings
implementation
,
strings
800
x222089
111E
Petya and Rectangle
2900
x66
111D
Petya and Coloring
combinatorics
,
dp
2300
x754
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1370
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3652
111A
Petya and Inequiations
greedy
1400
x4740
110B
Lucky String
constructive algorithms
,
strings
1100
x10161
110A
Nearly Lucky Number
implementation
800
x152732
109E
Lucky Interval
brute force
,
math
2700
x101
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x797
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3503
109B
Lucky Probability
brute force
,
probabilities
1900
x1540
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x17512
108B
Datatypes
math
,
sortings
1400
x2453
108A
Palindromic Times
implementation
,
strings
1000
x9347
107E
Darts
geometry
,
probabilities
2700
x135
107D
Crime Management
dp
,
graphs
,
matrices
2400
x407
107C
Arrangement
bitmasks
,
dp
2400
x369
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3443
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x5076
106E
Space Rescuers
geometry
,
ternary search
2100
x859
106D
Treasure Island
brute force
,
implementation
1700
x1316
106C
Buns
dp
1700
x5937
106B
Choosing Laptop
brute force
,
implementation
1000
x6080
106A
Card Game
implementation
1000
x7598
105E
Lift and Throw
brute force
2500
x186
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x139
105C
Item World
brute force
,
implementation
,
sortings
2200
x339
105B
Dark Assembly
brute force
,
probabilities
1800
x809
105A
Transmigration
implementation
1700
x1832
104A
Blackjack
implementation
800
x15298
103E
Buying Sets
flows
,
graph matchings
2900
x872
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x2109
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x949
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8800
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5960
102B
Sum of Digits
implementation
1000
x26141
102A
Clothes
brute force
1200
x2987
101E
Candies and Stones
divide and conquer
,
dp
2500
x486
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x682
101C
Vectors
implementation
,
math
2000
x697
101B
Buses
binary search
,
data structures
,
dp
1700
x2560
101A
Homework
greedy
1200
x3789
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x62
100I
Rotation
*special problem
,
geometry
,
math
1500
x348
100H
Battleship
*special problem
,
dfs and similar
,
implementation
2100
x76
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x112
100F
Polynom
*special problem
,
implementation
1800
x135
100E
Lamps in a Line
*special problem
,
math
1600
x271
100D
World of Mouth
*special problem
,
strings
1500
x303
100C
A+B
*special problem
,
implementation
1400
x531
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