题解 | #尼科彻斯定理#
尼科彻斯定理
https://www.nowcoder.com/practice/dbace3a5b3c4480e86ee3277f3fe1e85
import sys
n= int(input())
def StructString(n):
'''
首项为 first=n*(n-1)+1
'''
first=n*(n-1)+1
L=[]
L.append(first)
next=first
for i in range(n-1):
next=next+2
L.append(next)
L=list(map(lambda x: str(x),L))
return "+".join(L)
print(StructString(n))
