HackerRank Stryker code sprint - study code - D

PointFilter_studyCode_D.cs

using System;
using System.Collections.Generic;
using System.IO;
class Solution {
    public class Point : IComparable {
        public double x, y, z;
        public int index;
        public Point(double xx, double yy, double zz, int ii) {
            x = xx; y = yy; z = zz; index = ii;
        }
        public int CompareTo(Object o) {
            Point p = (Point)o;
            return this.z.CompareTo(p.z);
        }
    }
    static void Main(String[] args) {
        string[] line = Console.ReadLine().Split(new char[0], StringSplitOptions.RemoveEmptyEntries);
        int n = Int32.Parse(line[0]);
        int b = Int32.Parse(line[1]);
        Point[] points = new Point[n];
        for(int i=0; i<n; i++) {
            line = Console.ReadLine().Split(new char[0], StringSplitOptions.RemoveEmptyEntries);
            points[i] = new Point(Double.Parse(line[1]), Double.Parse(line[2]),
                                    Double.Parse(line[3]), Int32.Parse(line[0]));
        }
        Array.Sort(points);
        string s;
        Dictionary<int, Point> dict = new Dictionary<int, Point>();
        int index = n-1;
        for(int i=0; i<b; i++) {
            dict.Add(points[index].index, points[index]);
            index--;
        }
        s = Console.ReadLine();
        while(s != null && s.Trim().Length > 0) {
            line = s.Split(new char[0], StringSplitOptions.RemoveEmptyEntries);
            int z = Int32.Parse(line[1]);
            switch(line[0]) {
                case "F":
                case "f":
                    if(dict.ContainsKey(z)) {
                        Point point = dict[z];
                        Console.WriteLine(z + " = (" + point.x.ToString("F3") + "," 
                                          + point.y.ToString("F3") + "," + point.z.ToString("F3") + ")");
                    } else {
                        Console.WriteLine("Point doesn't exist in the bucket.");
                    }
                    break;
                case "R":
                case "r":
                    if(dict.ContainsKey(z)) {
                        if(index >= 0) {
                            dict.Remove(z);
                            dict.Add(points[index].index, points[index]);
                            index--;
                            Console.WriteLine("Point id " + z + " removed.");
                        } else {
                             Console.WriteLine("No more points can be deleted.");
                        }
                    } else {
                        Console.WriteLine("Point doesn't exist in the bucket.");
                    }
                    break;
            }
            s = Console.ReadLine();
        }
    }
}