黑默丁格的炮台

#include <iostream>
#include <math.h>
using namespace std;

typedef struct  Dot
{
    int x;
    int y;
}Dot;

Dot dot[4];
int main()
{

    int targetShock = 0;
    int R = 0;
    cin >> R;
    for (int i = 0; i < 8; i++)
    {
        if (i % 2 == 0)
        {
            cin >> dot[i / 2].x;
        }
        else
        {
            cin >> dot[i / 2].y;
        }

    }

    int targetX = dot[3].x;
    int targetY = dot[3].y;

    for (int i = 0; i < 3; i++)
    {
        int dis = pow(dot[i].x - targetX, 2) + pow(dot[i].y - targetY, 2);
        if (dis <= pow(R, 2))
        {
            targetShock++;
        }

    }

    cout << targetShock << "X";


    return 0;
}