Subset Essence Target Solution

Explanation: The essence values 47 and 900 can be combined to achieve the target essence value of 947, but since 47 is not in the list, we can use 10 + 20 + 30 + 40 + 847, however, 847 is also not in the list. Actually, 900 + 47 is the closest and 47 can be obtained by 40 + 7, but since 7 is not in the list, we look for other combinations and find that 10 + 20 + 30 + 40 + 847 is not possible because 847 is not in the list, so we try 900 + 47, and then try to make 47 using the remaining numbers.