⚠️ 中间产物：一边看得见，一边看不见

一批金额 [120, 80, 200, 150]，门槛 100：留下不低于门槛的，各乘 10，再加起来。这正是 l1_basic_11 里用循环做过的那条流水线。两种写法各跑一次，把命令式那版的中间产物也打出来：

A = [120, 80, 200, 150]
LINE = 100

# 命令式：中间产物都有名字
picked = [a for a in A if a >= LINE]
scaled = [a * 10 for a in picked]
total_imp = sum(scaled)

# 声明式：一行到底，中间产物没有名字
total_dec = sum(map(lambda a: a * 10, filter(lambda a: a >= LINE, A)))

print(str(len(picked)) + "/" + str(len(scaled)) + "/"
      + str(total_imp) + "/" + str(total_dec))