蓝桥杯 砝码称重

import os
import sys
n = int(input())
lis = list(map(int, input().split()))
set1 = set()
set1.add(0)
for i in lis:
    for j in list(set1):
        
        set1.add(i + j)
        set1.add(abs(i - j))
set1.remove(0)
print(len(set1))

感悟:

还是有一点点不能理解