修改后方便本地调试的Python3代码： m=int(input()) num=[int(x) for x in input().split()] def func(m,num):     if sum(num)<2*m:         return -1     else:         M=[]         for i in range(len(num)):             if sum(num[:i]+num[i+1:])>=2*m and len(num[:i]+num[i+1:])>2:                 M.append(num[i])             else:                 a=num[:i]+num[i+1:]                 if sum(num[:i]+num[i+1:])>=2*m and a[0]>=300 and a[1]>=300:                     M.append(num[i])         if len(M)==0:             return sum(num)         else:             num.remove(max(M))             return func(m,num) print('%.1f'%func(m,num))