Skip to content

Latest commit

 

History

History
157 lines (142 loc) · 4.44 KB

README.md

File metadata and controls

157 lines (142 loc) · 4.44 KB
Raw

java-coding-problems

  • Add - my own solution
  • Edit - improve solution with book and add various solution

ch01

P01. CountDuplicateCharacters

input output
da;dflkajd;slf initial counter is : {;=2, a=2, d=3, f=2, j=1, k=1, l=2, s=1}
improved counter is : {;=2, a=2, d=3, f=2, j=1, k=1, l=2, s=1}

P02. FirstUnrepeatedCharacter

P02 - First Nonrepeated Character
Let's find a First Nonrepeated Character.
Please write input text :

input output
Let's find a First Nonrepeated Character. ArrayList soultion:
Execution time : 13447800 ns ( 13 ms )
Found Character : L
LinkedHashMap soultion:
Execution time : 2525900 ns ( 2 ms )
Found Character : L
function style soultion:
Execution time : 26071000 ns ( 26 ms )
Found Character : L

P03. ReverseWords

P03 - Reverse Words :

input output
Reverse this words Array Solution :
Execution time : 4003400 ns ( 4 ms )
Reversed : sdrow siht esreveR
StringBuilder Solution :
Execution time : 2004100 ns ( 2 ms )
Reversed : sdrow siht esreveR

P04. ContainsOnlyDigits

input text : 45566336754493420932877387482372374982374823749823283974232237238472392309230923849023848234580383485342234287943943094234745374657346578465783467843653748654376837463847654382382938793287492326 P04 - Contains Only Digits :

input output
Exception Solution :
Execution time : 6578000 ns ( 6 ms )
Digits :true
Java 8 Solution :
Execution time : 6028700 ns ( 6 ms )
Digits :true
Regular Expression Solution :
Execution time : 1022600 ns ( 1 ms )
Digits :true

P05. CountVowelsAndConsonants

text is " ... Illinois Mathematics & Science Academy ..." P05 - Count Vowels And Consonants

input output
HashMap And Ascii Solution
Execution time : 12075000 ns ( 12 ms )
Vowels : 14
Consonants : 19
DIY Pair Solution
Execution time : 3005500 ns ( 3 ms )
Vowels : 14
Consonants : 19

P06 - Count Occurrences Of Character

Input text is : My high school, the Illinois Mathematics and Science Academy, showed me that anything is possible and that you're never too young to think big. At 15, I worked as a computer programmer at the Fermi National Accelerator Laboratory, or Fermilab. After graduating, I attended Stanford for a degree in economics and computer science.

input output
P06 - Count Occurrences Of Character
Map based soultion:
Execution time : 3128100 ns ( 2 ms )
Character 'w' occured 2 time(s)
String based soultion:
Execution time : 1000700 ns ( 1 ms )
Character 'w' occured 2 time(s)

P07 - Conver String to Int, Long, Float, Double

P07 - Convert String to Int, Long, Float, Double
String is 1233

input output
Parse Solution
Execution time : 1066000 ns ( 1 ms )
Integer is 1233
Long is 1233
Float is 1233.000000
Double is 1233.000000
Valueof Solution
Execution time : 35480900 ns ( 35 ms )
Integer is 1233
Long is 1233
Float is 1233.000000
Double is 1233.000000

P08 - Remove Whitespaces From String

P08 - Remove Whitespaces From String
input text is...
My high

school, the Illinois Mathematics and Science Academy, showed me that anything is possible and that you're never too young to think big. At 15, I worked as a computer programmer at the Fermi National Accelerator Laboratory, or Fermilab. After graduating, I attended Stanford for a degree in economics and computer science.

input output
String Method Solution
String : Myhighschool,theIllinoisMathematicsandScienceAcademy,showedmethatanythingispossibleandthatyou'renevertooyoungtothinkbig.At15,IworkedasacomputerprogrammerattheFermiNationalAcceleratorLaboratory,orFermilab.Aftergraduating,IattendedStanfordforadegreeineconomicsandcomputerscience.
Execution time : 2995600 ns ( 2 ms )

P09 - Join Multiple Strings

P09 - Join Multiple Strings

input output
StringBuilder Method
Execution time : 3996800 ns ( 3 ms )
String : Dream like a whale
Updated StringBuilder Method
Execution time : 1003300 ns ( 1 ms )
String : Dream like a whale
StringJoiner Method
Execution time : 999600 ns ( 0 ms )
String : Dream like a whale
String Join Method
Execution time : 697700 ns ( 0 ms )
String : Dream like a whale
String Join Method
Execution time : 1002200 ns ( 1 ms )
String : Dream like a whale
java 8 Method
Execution time : 4057500 ns ( 4 ms )
String : Dream like a whale