static void combHelper(int[]A, int i, int sum, int t, List<Integer>c, List<List<Integer>>rel) {
		int n=A.length;
		if (sum==t) {
			rel.add(new ArrayList<>(c));
			return;
		} else if (sum>t || i==n)
			return;
		combHelper(A,i+1,sum,t,new ArrayList<>(c),rel);
		c.add(A[i]);
		sum+=A[i];
		combHelper(A,i,sum,t,new ArrayList<>(c),rel);
	}