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why is the following test case returning 5.

Why is this generating a runtime error, I have checked it character by character

#include<iostream>
#include<algorithm>
#include<vector>

using namespace std;
#define SQR(n) (n)*(n)

struct Point{
int x, y;
Point(int a = 0, int b = 0) : x(a), y(b){}
static Point comp;
int operator - (Point p ...