题解 | #尼科彻斯定理#
尼科彻斯定理
https://www.nowcoder.com/practice/dbace3a5b3c4480e86ee3277f3fe1e85
n = int(input())
p = 1
for i in range(1, n + 1):
p += (i - 1) * 2
c = p # 记录起始值
for i in range(n):
print(p, end='')
if p != c + 2 * (n - 1):
print('+', end='')
p += 2
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