Compiler is not processing code please check the code of subset sum problem of recursion

#1

public class Main {

public static ArrayList<Integer> subset(int arr[],int ci,int n)
{

	if(c1==n)
   {	
    ArrayList<Integer> base = new ArrayList<Integer>();
	base.add(0);
	return base;
    }
	int first = a[ci];
	ArrayList<Integer> result = new ArrayList<Integer>();
	ArrayList<Integer> sol = new ArrayList<Integer>();
	result = subset(arr,ci+1);
	for(int e:result){
	sol = e;
	sol = first + e;
	}
	return sol;
}
public static void main(String args[]) {
ArrayList<Integer> output = new ArrayList<Integer>();
Scanner sc = new Scanner(System.in);
int t = sc.nextInt();
int n = sc.nextInt();
int arr = new int[n];
for(int i=0;i<n;i++)
{
    arr[i] = sc.nextInt();
}

for(int i=0;i<t;i++)
{
	output = subset(arr,0,n);
    output.remove(0);
	if(output.contains(0))
	System.out.println("YES");
	else
	System.out.println("NO");
}

}

#2

@affanahmed,
I have corrected your code for compiler errors: https://ide.codingblocks.com/s/195083
But there are logical errors present. Please correct them.

#3

package testrecursion;[quote=“affanahmed, post:1, topic:32394, full:true”]
public class Main {

public static ArrayList<Integer> subset(int arr[],int ci,int n)
{

	if(c1==n)
   {	
    ArrayList<Integer> base = new ArrayList<Integer>();
	base.add(0);
	return base;
    }
	int first = a[ci];
	ArrayList<Integer> result = new ArrayList<Integer>();
	ArrayList<Integer> sol = new ArrayList<Integer>();
	result = subset(arr,ci+1);
	for(int e:result){
	sol = e;
	sol = first + e;
	}
	return sol;
}
public static void main(String args[]) {
ArrayList<Integer> output = new ArrayList<Integer>();
Scanner sc = new Scanner(System.in);
int t = sc.nextInt();
int n = sc.nextInt();
int arr = new int[n];
for(int i=0;i<n;i++)
{
    arr[i] = sc.nextInt();
}

for(int i=0;i<t;i++)
{
	output = subset(arr,0,n);
    output.remove(0);
	if(output.contains(0))
	System.out.println("YES");
	else
	System.out.println("NO");
}

}
[/quote]

i tried this code in eclipse fine but your suggestions for logical improvement will help a lot.

import java.util.ArrayList;
import java.util.Scanner;

public class Subsetsum {
public static ArrayList subset(int arr[],int ci,int n)
{

		if(ci==n)
	   {	
	    ArrayList<Integer> base = new ArrayList<Integer>();
		base.add(0);
		return base;
	    }
		int first = arr[ci];
		ArrayList<Integer> result = new ArrayList<Integer>();
		ArrayList<Integer> sol = new ArrayList<Integer>();
		result = subset(arr,ci+1,n);
		for(int e:result) {
		sol.add(e);
		sol.add(first + e);
		}
		
		return sol;
	}
    
    public static void main(String args[])
    {
    	ArrayList<Integer> output = new ArrayList<Integer>();
    	Scanner sc = new Scanner(System.in);
    	int t = sc.nextInt();
    	

    	for(int i=0;i<t;i++)
    	{
                      int n = sc.nextInt();
    	         int[] arr = new int[n];
    	
    		for(int j=0;j<n;j++)
        	{
        	    arr[j] = sc.nextInt();
        	}
    		output = subset(arr,0,n);
    	    output.remove(0);
    		if(output.contains(0))
    		System.out.println("YES");
    		else
    		System.out.println("NO");
    	}    	
    }

}

#4

@affanahmed,
Your code was correct: https://ide.codingblocks.com/s/195458
Instead of:

System.out.println("YES");
else
System.out.println("NO");

You have to print:

			System.out.println("Yes");
		else
			System.out.println("No");

Rest the entire code is correct.

#5

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