using System; using System.Collections; public struct Interval{ private readonly int from, to; private readonly bool empty; // Construct a non-empty interval [from - to] if empty is false. // Else construct an empty interval (from and to are not used). private Interval(int from, int to, bool empty){ this.empty = empty; this.from = from; this.to = to; } public static Interval MakeInterval(int from, int to){ return new Interval(from,to,false); } public static Interval MakeEmptyInterval(){ return new Interval(0,0,true); } // Other Interval operations not shown }