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Rayan
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Before contest
Codeforces Round 998 (Div. 3)
03:00:34
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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
129B
Students and Shoelaces
brute force
,
dfs and similar
,
graphs
,
implementation
1200
x12498
129A
Cookies
implementation
900
x23122
128E
Birthday
geometry
,
math
2900
x100
128D
Numbers
constructive algorithms
,
implementation
2000
x1161
128C
Games with Rectangle
combinatorics
,
dp
2000
x3004
128B
String
brute force
,
constructive algorithms
,
hashing
,
implementation
,
string suffix structures
,
strings
2100
x2622
128A
Statues
dfs and similar
1500
x3230
127B
Canvas Frames
implementation
1000
x9033
127A
Wasted Time
geometry
900
x11387
126E
Pills
brute force
,
flows
2900
x89
126D
Fibonacci Sums
dp
,
math
2300
x848
126C
E-reader Display
constructive algorithms
,
greedy
2000
x747
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x20142
126A
Hot Bath
binary search
,
brute force
,
math
1900
x1442
125E
MST Company
binary search
,
graphs
2400
x1112
125D
Two progressions
constructive algorithms
,
greedy
2200
x421
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x939
125B
Simple XML
implementation
1000
x3018
125A
Measuring Lengths in Baden
math
1400
x2761
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x4048
124A
The number of positions
math
1000
x39366
123E
Maze
dfs and similar
,
dp
,
probabilities
,
trees
2500
x732
123D
String
string suffix structures
2300
x1238
123C
Brackets
combinatorics
,
dp
,
greedy
2300
x622
123B
Squares
math
1800
x1143
123A
Prime Permutation
implementation
,
number theory
,
strings
1300
x3660
122B
Lucky Substring
brute force
,
implementation
1000
x12466
122A
Lucky Division
brute force
,
number theory
1000
x127994
121E
Lucky Array
data structures
2400
x1763
121D
Lucky Segments
binary search
,
implementation
,
two pointers
2500
x281
121C
Lucky Permutation
brute force
,
combinatorics
,
number theory
1900
x1293
121B
Lucky Transformation
strings
1500
x2596
121A
Lucky Sum
implementation
1100
x9362
120J
Minimum Sum
divide and conquer
,
geometry
,
sortings
1900
x948
120I
Luck is in Numbers
greedy
2200
x308
120H
Brevity is Soul of Wit
graph matchings
1800
x1428
120G
Boom
implementation
1800
x691
120F
Spiders
dp
,
greedy
,
trees
1400
x3690
120E
Put Knight!
games
,
math
1400
x2767
120D
Three Sons
brute force
1400
x1947
120C
Winnie-the-Pooh and honey
implementation
,
math
1100
x3703
120B
Quiz League
implementation
1100
x3461
120A
Elevator
brute force
,
implementation
,
math
1000
x4882
119E
Alternative Reality
geometry
2400
x97
119D
String Transformation
hashing
,
strings
2500
x514
119C
Education Reform
dp
2000
x967
119B
Before Exam
constructive algorithms
,
implementation
,
sortings
1900
x1083
119A
Epic Game
implementation
800
x27699
118E
Bertown roads
dfs and similar
,
graphs
2000
x6875
118D
Caesar's Legions
dp
1700
x17852
118C
Fancy Number
brute force
,
greedy
,
sortings
,
strings
1900
x2618
118B
Present from Lena
constructive algorithms
,
implementation
1000
x30707
118A
String Task
implementation
,
strings
1000
x199809
117E
Tree or not Tree
data structures
,
divide and conquer
,
implementation
,
trees
2900
x356
117D
Not Quick Transformation
divide and conquer
,
math
2500
x343
117C
Cycle
dfs and similar
,
graphs
2000
x2684
117B
Very Interesting Game
brute force
,
number theory
1800
x1628
117A
Elevator
implementation
,
math
1300
x2036
116B
Little Pigs and Wolves
greedy
,
implementation
1100
x13893
116A
Tram
implementation
800
x148529
115E
Linear Kingdom Races
data structures
,
dp
2400
x1685
115D
Unambiguous Arithmetic Expression
dp
,
expression parsing
2600
x409
115C
Plumber
math
2200
x613
115B
Lawnmower
greedy
,
sortings
1500
x2636
115A
Party
dfs and similar
,
graphs
,
trees
900
x35577
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3774
114A
Cifera
math
1000
x14282
113E
Sleeping
combinatorics
,
implementation
,
math
2700
x120
113D
Museum
math
,
matrices
,
probabilities
2700
x691
113C
Double Happiness
brute force
,
math
,
number theory
2200
x1251
113B
Petr#
brute force
,
data structures
,
hashing
,
strings
2000
x2907
113A
Grammar Lessons
implementation
,
strings
1600
x2313
112B
Petya and Square
implementation
,
math
1200
x4234
112A
Petya and Strings
implementation
,
strings
800
x235696
111E
Petya and Rectangle
2900
x67
111D
Petya and Coloring
combinatorics
,
dp
2300
x793
111C
Petya and Spiders
bitmasks
,
dp
,
dsu
2100
x1405
111B
Petya and Divisors
binary search
,
data structures
,
number theory
1900
x3738
111A
Petya and Inequiations
greedy
1400
x4826
110B
Lucky String
constructive algorithms
,
strings
1100
x10328
110A
Nearly Lucky Number
implementation
800
x163148
109E
Lucky Interval
brute force
,
math
2700
x104
109D
Lucky Sorting
constructive algorithms
,
sortings
2000
x822
109C
Lucky Tree
dp
,
dsu
,
trees
1900
x3655
109B
Lucky Probability
brute force
,
probabilities
1900
x1569
109A
Lucky Sum of Digits
brute force
,
implementation
1000
x18008
108B
Datatypes
math
,
sortings
1400
x2495
108A
Palindromic Times
implementation
,
strings
1000
x9457
107E
Darts
geometry
,
probabilities
2700
x140
107D
Crime Management
dp
,
graphs
,
matrices
2400
x434
107C
Arrangement
bitmasks
,
dp
2400
x396
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3581
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x5177
106E
Space Rescuers
geometry
,
ternary search
2100
x887
106D
Treasure Island
brute force
,
implementation
1700
x1372
106C
Buns
dp
1700
x6129
106B
Choosing Laptop
brute force
,
implementation
1000
x6181
106A
Card Game
implementation
1000
x7697
105E
Lift and Throw
brute force
2500
x193
105D
Entertaining Geodetics
brute force
,
dsu
,
implementation
2700
x141
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