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Codeforces Round 961 (Div. 2)
21:20:51
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Difficulty:
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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
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2556
118B
Present from Lena
constructive algorithms
,
implementation
1000
x29192
118A
String Task
implementation
,
strings
1000
x186310
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x318
117D
Not Quick Transformation
divide and conquer
,
math
2500
x332
117C
Cycle
dfs and similar
,
graphs
2000
x2579
117B
Very Interesting Game
brute force
,
number theory
1800
x1547
117A
Elevator
implementation
,
math
1300
x1987
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13597
116A
Tram
implementation
800
x136254
115E
Linear Kingdom Races
data structures
,
dp
2400
x1433
115D
Unambiguous Arithmetic Expression
dp
,
expression parsing
2600
x379
115C
Plumber
math
2200
x591
115B
Lawnmower
greedy
,
sortings
1500
x2453
115A
Party
dfs and similar
,
graphs
,
trees
900
x33595
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3571
114A
Cifera
math
1000
x13987
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x118
113D
Museum
math
,
matrices
,
probabilities
2700
x658
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1216
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2764
113A
Grammar Lessons
implementation
,
strings
1600
x2271
112B
Petya and Square
implementation
,
math
1200
x4104
112A
Petya and Strings
implementation
,
strings
800
x215995
111E
Petya and Rectangle
2900
x65
111D
Petya and Coloring
combinatorics
,
dp
2300
x727
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1330
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3616
111A
Petya and Inequiations
greedy
1400
x4702
110B
Lucky String
constructive algorithms
,
strings
1100
x10084
110A
Nearly Lucky Number
implementation
800
x147740
109E
Lucky Interval
brute force
,
math
2700
x101
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x659
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3289
109B
Lucky Probability
brute force
,
probabilities
1900
x1395
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x17063
108B
Datatypes
math
,
sortings
1400
x2434
108A
Palindromic Times
implementation
,
strings
1000
x9286
107E
Darts
geometry
,
probabilities
2700
x128
107D
Crime Management
dp
,
graphs
,
matrices
2400
x402
107C
Arrangement
bitmasks
,
dp
2400
x364
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3387
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x5015
106E
Space Rescuers
geometry
,
ternary search
2100
x853
106D
Treasure Island
brute force
,
implementation
1700
x1306
106C
Buns
dp
1700
x5834
106B
Choosing Laptop
brute force
,
implementation
1000
x6026
106A
Card Game
implementation
1000
x7524
105E
Lift and Throw
brute force
2500
x184
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x138
105C
Item World
brute force
,
implementation
,
sortings
2200
x330
105B
Dark Assembly
brute force
,
probabilities
1800
x806
105A
Transmigration
implementation
1700
x1825
104A
Blackjack
implementation
800
x15133
103E
Buying Sets
flows
,
graph matchings
2900
x845
103D
Time to Raid Cowavans
brute force
,
data structures
,
sortings
2100
x2039
103C
Russian Roulette
constructive algorithms
,
greedy
1900
x940
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8657
103A
Testing Pants for Sadness
greedy
,
implementation
,
math
1100
x5923
102B
Sum of Digits
implementation
1000
x25462
102A
Clothes
brute force
1200
x2959
101E
Candies and Stones
divide and conquer
,
dp
2500
x480
101D
Castle
dp
,
greedy
,
probabilities
,
sortings
,
trees
2300
x675
101C
Vectors
implementation
,
math
2000
x690
101B
Buses
binary search
,
data structures
,
dp
1700
x2529
101A
Homework
greedy
1200
x3756
100J
Interval Coloring
*special problem
,
greedy
,
math
2400
x62
100I
Rotation
*special problem
,
geometry
,
math
1500
x345
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
x269
100D
World of Mouth
*special problem
,
strings
1500
x302
100C
A+B
*special problem
,
implementation
1400
x525
100B
Friendly Numbers
*special problem
,
implementation
1500
x539
100A
Carpeting the Room
*special problem
,
implementation
1100
x908
99B
Help Chef Gerasim
implementation
,
sortings
1300
x2927
99A
Help Far Away Kingdom
strings
800
x6610
98E
Help Shrek and Donkey
dp
,
games
,
math
,
probabilities
2700
x467
98D
Help Monks
constructive algorithms
2500
x182
98C
Help Greg the Dwarf
geometry
,
ternary search
2500
x303
98B
Help King
implementation
,
probabilities
,
trees
2200
x118
98A
Help Victoria the Wise
brute force
,
implementation
1700
x1176
97E
Leaders
dfs and similar
,
dsu
,
graphs
,
trees
2200
x375
97D
Robot in Basement
bitmasks
,
brute force
,
implementation
2700
x243
97C
Winning Strategy
binary search
,
graphs
,
math
,
shortest paths
2400
x302
97B
Superset
constructive algorithms
,
divide and conquer
2300
x811
97A
Domino
brute force
,
implementation
2400
x258
96B
Lucky Numbers (easy)
binary search
,
bitmasks
,
brute force
1300
x14912
96A
Football
implementation
,
strings
900
x153206
95E
Lucky Country
dp
,
dsu
,
graphs
2500
x1429
95D
Horse Races
dp
,
math
2500
x420
95C
Volleyball
shortest paths
1900
x2731
95B
Lucky Numbers
dp
,
greedy
1800
x1198
95A
Hockey
implementation
,
strings
1600
x1650
94B
Friends
graphs
,
implementation
,
math
1300
x4564
94A
Restoring Password
implementation
,
strings
900
x10345
93E
Lostborn
dp
,
math
,
number theory
2600
x463
93D
Flags
dp
,
math
,
matrices
2500
x340
93C
Azembler
brute force
,
implementation
2500
x413
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