Info by dfs, Java - rextester

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//'main' method must be in a class 'Rextester'.
//openjdk version '11.0.5'

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        String str=sc.nextLine();
        int l=str.length();
        int i;
        String str2= new String("");
        LinkedList<Integer> a[]=new LinkedList[l];
        
        for(i=0;i<l;i++)
        {
              char x=str.charAt(i);
            if( x=='N')
                str2+='0';
            else
                str2+=x;
                
        }
        
        for(i=0;i<l;i++)
            a[i]=new LinkedList<>();
         
       System.out.println(str2);
       
        for(i=0;i<(l/2);i++)
        {
            int tmp1,tmp2,tmp3;
            char zz=str2.charAt(i);
            tmp3=Integer.parseInt(String.valueOf(zz));
            char xx=str2.charAt((2*i+1));
            char yy=str2.charAt((2*i+2));
            
           
               tmp1=Integer.parseInt(String.valueOf(xx));
               tmp2=Integer.parseInt(String.valueOf(yy)); 
            
              System.out.print("i---->"+tmp3+" is conneccted to ");
             System.out.print(tmp1+ " ");
             System.out.println(tmp2);
            
            a[tmp3].addFirst(tmp1);
            a[tmp1].addFirst(tmp3);
            
            a[tmp3].addFirst(tmp2);
            a[tmp2].addFirst(tmp3);
            
        }
        
        for ( i = 0; i <l ; i++) {
            if(a[i].size()>0) {
                System.out.print("Vertex " + i + " is connected to: ");
                for (int j = 0; j < a[i].size(); j++) {
                    System.out.print(a[i].get(j) + " ");
                }
                System.out.println();
            }
        }
        
    }
}

[ - ] Show input
Compilation time: 0.82 sec, absolute running time: 0.32 sec, cpu time: 0.35 sec, memory peak: 42 Mb, absolute service time: 1,42 sec