标题：方格计数

// x^2+y^2=r^2
    private static int work2(int n) {
        int ans = 0;
        for (int i = 1; i <= n; ++i) {
            for (int j = 1; j <= n; ++j) {
                int d = i * i + j * j;
                if (d <= n * n) {
                    ++ans;//一个象限的个数
                }
            }
        }
        return ans * 4;
    }

    public static void main(String[] args) {
        System.out.println(work2(2));//半径
    }