题解 | 尼科彻斯定理
def inv_the(n):
m = n*n*n
m_j = []
x = n*n
pa = n // 2
if x%2 == 1:
for i in range(n):
m_j.append(x-2*pa+2*i)
elif x%2 == 0:
for i in range(n):
m_j.append(x-2*pa+1+2*i)
return '+'.join(map(str, m_j))
n = int(input().strip())
print(inv_the(n))
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