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Sequence Equation Hackerrank Solution - java

 Sequence Equation Hackerrank Solution - java 


for explanation watch video ::




code::

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {

    /*
     * Complete the 'permutationEquation' function below.
     *
     * The function is expected to return an INTEGER_ARRAY.
     * The function accepts INTEGER_ARRAY p as parameter.
     */

    public static List<Integer> permutationEquation(List<Integer> p) {
        // p = [4 3 5 1 2]
         //     1 2 3 4 5
        //1)size of arry
        int n = p.size();//5
        //2)find index of 1 to n in arraylist p
        ArrayList<Integer> al1 = new ArrayList<>();
        for(int i=1;i<=n;i++){
            al1.add(p.indexOf(i)+1);
        }
        //al1 = [4,5,2,1,3];
        //3)find index of al1 elemnts in arraylist p
        ArrayList<Integer> al2 = new ArrayList<>();
        for(int i=0;i<n;i++){
            al2.add(p.indexOf(al1.get(i))+1);
        }
        //al2 = [1,3,5,4,2];
        return al2;
    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int n = Integer.parseInt(bufferedReader.readLine().trim());

        List<Integer> p = Stream.of(bufferedReader.readLine().replaceAll("\\s+$""").split(" "))
            .map(Integer::parseInt)
            .collect(toList());

        List<Integer> result = Result.permutationEquation(p);

        bufferedWriter.write(
            result.stream()
                .map(Object::toString)
                .collect(joining("\n"))
            + "\n"
        );

        bufferedReader.close();
        bufferedWriter.close();
    }
}

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