题解 | #尼科彻斯定理#
尼科彻斯定理
https://www.nowcoder.com/practice/dbace3a5b3c4480e86ee3277f3fe1e85
有点累
n = int(input())
if n**2 % 2 == 0:
print('+'.join(list(map(str,list(reversed([n**2-2*x+1 for x in range(1,int(n/2)+1)]))+
[n**2+2*x-1 for x in range(1,int(n/2)+1)]))))
else:
print('+'.join(list(map(str,list(reversed([n**2-2*x for x in range(1,int(n/2)+1)]))+[n**2]+
[n**2+2*x for x in range(1,int(n/2)+1)]))))
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