1707: Count Squars
内存限制：128 MB
时间限制：5.000 S
评测方式：文本比较
命题人：
提交：0
解决：0
题目描述
Given a set of points with integer coordinates xi, yi, i = 1...N, your program must find all the squares having each of four vertices in one of these points.
输入
Input file contains integer N followed by N pairs of integers xi yi.
-10^4 ≤ xi, yi ≤ 10^4, 1 ≤ N ≤ 2000. All points in the input are different.
输出
One integer that the the number of squars.One line per case.
样例输入 复制
4 0 0 4 3 -3 4 1 7
9
1 1 1 2 1 3
2 1 2 2 2 3
3 1 3 2 3 3
样例输出 复制
1
6