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  1. Practice
  2. Algorithms
  3. Warmup
  4. Plus Minus
  5. Discussions

Plus Minus

  • MoAboulmagd + 6 comments

    Could have done the conditionals and assigning arr the scanner.nextInt() numbers all in one for loop: 

    import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scanner = new Scanner(System.in);
        int size = scanner.nextInt();
        
        int[] a = new int[size];
        
        double fractionPositive = 0;
        double fractionZero = 0;
        double fractionNegative = 0;
        
        for (int i = 0; i < size; i++){
            a[i] = scanner.nextInt();
            if (a[i] > 0) fractionPositive += 1;
            else if (a[i] == 0) fractionZero += 1;
            else if (a[i] < 0) fractionNegative += 1;
        }
        
        System.out.println(fractionPositive/size);
        System.out.println(fractionNegative/size);
        System.out.println(fractionZero/size);
        
    }
}
    • antokurnianto82 + 5 comments

      Should've used printf for more precise result. Cool solution tho'.

      System.out.printf("%.6f %n",fractionPositive/n);
System.out.printf("%.6f %n",fractionNegative/n);
System.out.printf("%.6f %n",fractionZero/n);
      • sahoosiddharth3 + 0 comments

        https://www.hackerrank.com/challenges/plus-minus/forum/comments/236802

      • alammdtalib + 2 comments

        is it ("%.6f % n") regular expression and how it is formatting the result

        • alammdtalib + 0 comments

          Ahh got it to limit the output after decimal..

        • bmk9727 + 0 comments

          but in between " " this will coment than how wil be this work??

      • rajatshukla + 0 comments

        thank u...

      • bmk9727 + 1 comment

        ("%.6f %n", this "," sould we use +

        • Parteekjain25 + 0 comments

          no this will print the whole string

      • abhiemin + 3 comments

        import java.io.; import java.util.; import java.text.; import java.math.; import java.util.regex.*;

        public class Solution {

        static void plusMinus(int[] arr) {
    double p=0,n=0,z=0;
    int al = arr.length;
    for(int i=0;i<al;i++)
    {
        if(arr[i]>0)
        {
            p++;
        }
        else if(arr[i]<0)
        {
            n++;
        }
        else if (arr[i]==0)
        {
            z++;
        }

    }
    System.out.printf("\n%1$.6f", p/al);
    System.out.printf("\n%1$.6f" ,n/al);
    System.out.printf("\n%1$.6f", z/al);
}                  

public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    int n = in.nextInt();
    int[] arr = new int[n];
    for(int arr_i = 0; arr_i < n; arr_i++){
        arr[arr_i] = in.nextInt();
    }
    plusMinus(arr);
    in.close();
}

        } why this code is not being approved???

        • mariusz_wiloch + 0 comments

          because there is one \n at the beginning which is not necasary

          System.out.printf("%1$.6f", p/al);

        • 1634810079_coe3b + 1 comment

          add \n after 6f in each s.o.pln then it will pass all test cases

          • singh_rishabh_11 + 0 comments

            just remove \n from first printf not add !

        • singh_rishabh_11 + 0 comments

          just remove \n from first printf as its starting from end of line which is against the format

    • marikantivenkat1 + 0 comments

      cool solution bro

    • Arpit7694 + 0 comments

      We can also use float instead of double. It will work.

    • naghmehjooon + 0 comments

      Didn't really need an array.

    • dmbujak3 + 0 comments

      You also don't need to count one of them, for instance, if you don't count negative ones, your output is: System.out.println((size-fractionPositive-fractionZero)/size);

    • AdYaNsH + 2 comments
      System.out.printf("%.06f%n%.06f%n%.06f",fractionPositive/size,fractionNegative/size,fractionZero/size);

      This could be used as a replacement for your print statement

      • unlimitet2011 + 0 comments

        good solution to union all sout.

      • aneta_sorokovsk1 + 1 comment

        Can someone exaplin how to get this regex? %.06f%n%.06f%n%.06f I am a little confused

        • unlimitet2011 + 1 comment

          It is not a regex, Google pls - print format in Java

          • aneta_sorokovsk1 + 0 comments

            awesome thanks