找规律,没有去验证,找到了对应的数去输出,没有别的题解方便,但是比找出奇数list 再去求和快。
a = int(input())
b = a**3
c = b/a
x = []
if c%2 !=0:
x.append(c)
for i in range(1,int((a+1)/2)):
x.append(c-i*2)
x.append(c+i*2)
else:
for j in range(int(a/2)):
x.append(c-1-j*2)
x.append(c+1+j*2)
x.sort()
p = ''
for i in x:
p += '+' + str(int(i))
print(p[1:])