slope

#include <stdio.h>

int main()
{
    int n;
    scanf("%d",&n);
    double xie,xie_max=-1e12,x[1024],y[1024],px,py;
    for (int i = 0; i < n; i++)
    {
        scanf("%lf%lf",&x[i],&y[i]);
    }
    //input

    for (int i = 0; i < n; i++)
    {
        for (int j = 0; j < n; j++)
        {
            if (x[i]>x[j])
            {
                px = x[i];
                py = y[i];
                x[i] = x[j];
                y[i] = y[j];
                x[j] = px;
                y[j] = py;
            }
        }
    }
    //place the smaller in the front

    for (int i = 0; i < n-1; i++)
    {
        xie = 1.0*(y[i]-y[i+1])/(x[i]-x[i+1]);
        if (xie > xie_max)
        {
            xie_max = xie;
        }
    }
    //judge the biggest one

    printf("%.3f",xie_max);
}