Hackerrank - Sequence Equation

 Given a sequence of  integers,  where each element is distinct and satisfies . For each  where , that is  increments from  to , find any integer  such that  and keep a history of the values of  in a return array.

Example

Each value of  between  and , the length of the sequence, is analyzed as follows:

  1. , so 
  2. , so 
  3. , so 
  4. , so 
  5. , so 

The values for  are .

Function Description

Complete the permutationEquation function in the editor below.

permutationEquation has the following parameter(s):

  • int p[n]: an array of integers

Returns

  • int[n]: the values of  for all  in the arithmetic sequence  to 

Input Format

The first line contains an integer , the number of elements in the sequence.
The second line contains  space-separated integers  where .

Constraints

  • , where .
  • Each element in the sequence is distinct.

Sample Input 0

3
2 3 1

Sample Output 0

2
3
1

Explanation 0

Given the values of , , and , we calculate and print the following values for each  from  to :

  1. , so we print the value of  on a new line.
  2. , so we print the value of  on a new line.
  3. , so we print the value of  on a new line.

Sample Input 1

5
4 3 5 1 2

Sample Output 1

1
3
5
4
2
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 {


    public static List<Integer> permutationEquation(List<Integer> p) {
     HashMap<Integer, Integer> map = new HashMap<>();
     
     for (int i = 0; i < p.size(); i++) {
        map.put(p.get(i),i+1) ;
     }
     
     List<Integer> result = new ArrayList<>();
     
     for (Integer num : map.values()) {
         result.add(map.get(num));
     }
     
     System.out.println(result);
     
     return result;
    }

}

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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