using System;
using System.Collections.Generic;
using System.Linq;

internal class Program {
    private static readonly Func<double, double, List<double>>[] Fs_ = {
        (x, y) => new List<double> //1
        {
            -(x * x + y * y - 9 * 9),
            x
        },
        (x, y) => new List<double> //2
        {
            -(x * x + y * y - 7 * 7),
            x * x + y * y - 3 * 3
        },
        (x, y) => new List<double> //3
        {
            x * x + y * y - 5 * 5,
            -(x * x + y * y - 10 * 10),
            y
        },
        (x, y) => //4 - костыль
        {
            var values = new List<double> {
                -(x * x + y * y - 15 * 15),
                x * x + y * y - 25 * 25
            };

            if (values.Any(v => Math.Abs(v) < 0.01))
                return new List<double> {0};
            return values.Any(v => v > 0) ? new List<double> {1} : new List<double> {-1};
        },
        (x, y) => new List<double> //5
        {
            -(x * x + y * y - 15 * 15),
            -(Math.Abs(x) - y)
        },
        (x, y) => new List<double> //6
        {
            -(Math.Abs(x) - y),
            -(y - 12)
        },
        (x, y) => new List<double> //7
        {
            -(x - 70),
            x - y,
            y
        },
        (x, y) => new List<double> //8
        {
            -Math.Abs(x) - y,
            -(-y - 100)
        },
        (x, y) => new List<double> //9
        {
            -(x * x + y * y - 10 * 10),
            -(-x - y)
        },
    };

    private static void Main() {
        do {
            Console.Write("x = ");
            var x = double.Parse(Console.ReadLine() ?? throw new InvalidOperationException());
            Console.Write("y = ");
            var y = double.Parse(Console.ReadLine() ?? throw new InvalidOperationException());

            for (var i = 0; i < Fs_.Length; i++)
                Console.WriteLine($"F({i + 1}) => {ContainsPoint(x, y, Fs_[i])}");
        } while (true);

        Console.ReadKey();
    }

    private static string ContainsPoint(double x, double y, Func<double, double, List<double>> f) {
        var values = f(x, y);

        if (values.Any(v => v < 0))
            return "Нет";
        return values.Any(v => Math.Abs(v) < 0.01) ? "На границе" : "Да"; // Math.Abs(v) < 0.01 сравнение с 0
    }
}