Output: Standard Output
Time Limit: 3 Seconds
Given n points on the XY plane, count how many regular rectangles are formed. A rectangle is regular if and only if its sides are all parallel to the axis.
Input
The first line contains the number of tests t(1<=t<=10). Each case contains a single line with a positive integer n(1<=n<=5000), the number of points. There are n lines follow, each line contains 2 integers x, y (0<=x, y<=109) indicating the coordinates of a point.
Output
For each test case, print the case number and a single integer, the number of regular rectangles found.
|
2 5 0 0 2 0 0 2 2 2 1 1 3 0 0 0 30 0 900 |
Case 1: 1 Case 2: 0 |
Problemsetter: Rujia Liu, Member of Elite Problemsetters' Panel
Special Thanks: IOI2003 China National Training Team