FZU 2140 Forever 0.5（将圆离散化）

主要就是将圆离散化,剩下的都好办

#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
using namespace std;
#define add 0.005
double x[],y[];
int main()
{
    int t,n;
    scanf("%d",&t);
    x[] = y[] = ;
    x[] = ,y[] = ;
    x[] = 0.5,y[] = sqrt(0.75);
    x[] = 0.5,y[] = y[]-;
    for(int i = ;i <= ;i++)
    {
        x[i] = 0.5 + (i-) * add;
        y[i] = sqrt( - x[i]*x[i]);
    }
    while(t--)
    {
        scanf("%d",&n);
        if(n <= )
        {
            puts("No");
            continue;
        }
        puts("Yes");
        for(int i = ;i < n;i++)
        {
            printf("%.6lf %.6lf\n",x[i],y[i]);
        }
    }
}