这是一个关于在CodeForces的939A问题‘Love Triangle’的解题报告。题目描述了地球上n架飞机彼此喜欢的情况，询问是否存在爱情三角形（即A喜欢B，B喜欢C，C喜欢A）。输入包含飞机数量n和每架飞机喜欢的飞机编号，输出是存在或不存在爱情三角形。提供的解题思路是通过暴力判断来确定。
Love Triangle
As you could know there are no male planes nor female planes. However, each plane on Earth likes some other plane. There are n planes on Earth, numbered from 1 to n, and the plane with number i likes the plane with number fi, where 1 ≤ fi ≤ n and fi ≠ i.
We call a love triangle a situation in which plane A likes plane B, plane B likes plane C and plane C likes plane A. Find out if there is any love triangle on Earth.
Input
The first line contains a single integer n (2 ≤ n ≤ 5000) — the number of planes.
The second line contains n
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