凑单, C# - rextester

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Microsoft (R) Visual C# Compiler version 2.9.0.63208 (958f2354)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading;
namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var 总数 = 2846.23;
            var 误差 = 0.05;
            var 单价1 = 39.2;
            var 单价2 = 40.6;
            var 单价3 = 41.16;
            
            
            var total = 总数;
            var tolerence = 误差;
            var x = 单价1;
            var y = 单价2;
            var z = 单价3;
            
           Thread.CurrentThread.CurrentCulture = System.Globalization.CultureInfo.InvariantCulture;
           for (var a = 1; a <= total/x; a++)
               for(var b = 1; b <= total/y; b++)
               for(var c = 1; c <= total/z; c++){
                   var result = a*x + b*y + c*z;
                   var sub = total - result;
                       if (sub > 0 && sub <= tolerence)
                           Console.WriteLine("{0, 5} {1,5} {2,5} {3,10} {4,20}", a, b, c, result, sub);
           }
        }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,23 sec, absolute running time: 0,09 sec, cpu time: 0,11 sec, average memory usage: 13 Mb, average nr of threads: 2, absolute service time: 0,39 sec