CSharp: Iterative Algorithms

项目结构：

/* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : Settings.cs */ using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Config { /// <summary> /// /// </summary> public static class Settings { //钻石评分权重 public const double DiamondWeightCarat = 0.5; public const double DiamondWeightColor = 0.3; public const double DiamondWeightClarity = 0.2; public const double PriceIterStep = 0.01; public const double MinMarkupCoeff = 1.3; public const double MaxMarkupCoeff = 2.2; } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : Diamond.cs */ using CSharpAlgorithms.Iterative.Config; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Models { /// <summary> /// /// </summary> public class Diamond { public string StoneId { get; set; } = string.Empty; public double Carat { get; set; } public string Color { get; set; } = string.Empty; public string Clarity { get; set; } = string.Empty; public double CostPrice { get; set; } public double CalcComprehensiveScore() { Dictionary<string, double> colorMap = new() { {"D",100},{"E",96},{"F",92},{"G",88},{"H",84},{"I",78} }; Dictionary<string, double> clarityMap = new() { {"FL",100},{"VVS1",95},{"VVS2",90},{"VS1",85},{"VS2",80},{"SI1",70} }; double cScore = Carat * 100; double colScore = colorMap.GetValueOrDefault(Color, 60); double claScore = clarityMap.GetValueOrDefault(Clarity, 60); return cScore * Settings.DiamondWeightCarat + colScore * Settings.DiamondWeightColor + claScore * Settings.DiamondWeightClarity; } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : JadeBlank.cs */ using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Models { /// <summary> /// /// </summary> public class JadeBlank { public string BlankId { get; set; } = string.Empty; public double Length { get; set; } public double Width { get; set; } public double Thick { get; set; } public double CostPrice { get; set; } public double UsableRate { get; set; } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : Product.cs */ using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Models { /// <summary> /// /// </summary> public class Product { public string ProductId { get; set; } = string.Empty; public string Name { get; set; } = string.Empty; public double Cost { get; set; } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : RingMount.cs */ using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Models { /// <summary> /// /// </summary> public class RingMount { public string MountId { get; set; } = string.Empty; public string Material { get; set; } = string.Empty; public double CostPrice { get; set; } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : DiamondRepository.cs */ using CSharpAlgorithms.Iterative.Models; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Repository { /// <summary> /// /// </summary> public class DiamondRepository : IBaseRepository<Diamond> { private readonly List<Diamond> _storage = new() { new Diamond{StoneId="D001",Carat=0.52,Color="H",Clarity="VS1",CostPrice=24800}, new Diamond{StoneId="D002",Carat=0.48,Color="G",Clarity="VS2",CostPrice=22100}, new Diamond{StoneId="D003",Carat=0.55,Color="I",Clarity="SI1",CostPrice=21300}, }; public List<Diamond> ListAll() { return new List<Diamond>(_storage); } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : IBaseRepository.cs */ using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Repository { /// <summary> /// /// </summary> /// <typeparam name="T"></typeparam> public interface IBaseRepository<T> { List<T> ListAll(); } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : JadeRepository.cs */ using CSharpAlgorithms.Iterative.Models; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Repository { /// <summary> /// /// </summary> public class JadeRepository : IBaseRepository<JadeBlank> { private readonly List<JadeBlank> _storage = new() { new JadeBlank{BlankId="J001",Length=32.5,Width=21.2,Thick=7.3,CostPrice=6800,UsableRate=0.86}, new JadeBlank{BlankId="J002",Length=30.1,Width=19.8,Thick=6.9,CostPrice=6200,UsableRate=0.91}, new JadeBlank{BlankId="J003",Length=36.0,Width=24.1,Thick=8.2,CostPrice=7500,UsableRate=0.79}, }; public List<JadeBlank> ListAll() { return new List<JadeBlank>(_storage); } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : RingMountRepository.cs */ using CSharpAlgorithms.Iterative.Models; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Repository { /// <summary> /// /// </summary> public class RingMountRepository : IBaseRepository<RingMount> { private readonly List<RingMount> _storage = new() { new RingMount{MountId="M001",Material="18K",CostPrice=4200}, new RingMount{MountId="M002",Material="铂金",CostPrice=5600}, }; public List<RingMount> ListAll() { return new List<RingMount>(_storage); } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : Request.cs */ using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Schemas { /// <summary> /// /// </summary> /// <param name="Budget"></param> /// <param name="Material"></param> public record DiamondRecommendRequest(double Budget, string Material); /// <summary> /// /// </summary> /// <param name="MinL"></param> /// <param name="MaxL"></param> /// <param name="MinW"></param> /// <param name="MaxW"></param> /// <param name="MinT"></param> /// <param name="MaxT"></param> /// <param name="PriceMin"></param> /// <param name="PriceMax"></param> public record JadeMatchRequest( double MinL, double MaxL, double MinW, double MaxW, double MinT, double MaxT, double PriceMin, double PriceMax); /// <summary> /// /// </summary> /// <param name="BaseCost"></param> /// <param name="MinCoeff"></param> /// <param name="MaxCoeff"></param> /// <param name="Step"></param> public record PriceOptRequest(double BaseCost, double MinCoeff, double MaxCoeff, double Step); } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : Response.cs */ using CSharpAlgorithms.Iterative.Models; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Schemas { /// <summary> /// /// </summary> /// <param name="Diamond"></param> /// <param name="Mount"></param> /// <param name="TotalCost"></param> /// <param name="Score"></param> public record DiamondComboResult(Diamond Diamond, RingMount Mount, double TotalCost, double Score); /// <summary> /// /// </summary> /// <param name="Blank"></param> public record JadeMatchResult(JadeBlank Blank); /// <summary> /// /// </summary> /// <param name="BestCoeff"></param> /// <param name="BestSellPrice"></param> /// <param name="MaxGrossProfit"></param> public record PriceOptResult(double BestCoeff, double BestSellPrice, double MaxGrossProfit); } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : DiamondRecommendService.cs */ using CSharpAlgorithms.Iterative.Models; using CSharpAlgorithms.Iterative.Repository; using CSharpAlgorithms.Iterative.Schemas; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Services { /// <summary> /// /// </summary> public class DiamondRecommendService { private readonly IBaseRepository<Diamond> _diaRepo; private readonly IBaseRepository<RingMount> _mountRepo; /// <summary> /// /// </summary> /// <param name="diaRepo"></param> /// <param name="mountRepo"></param> public DiamondRecommendService(IBaseRepository<Diamond> diaRepo, IBaseRepository<RingMount> mountRepo) { _diaRepo = diaRepo; _mountRepo = mountRepo; } /// <summary> /// /// </summary> /// <param name="req"></param> /// <returns></returns> public DiamondComboResult? FindBestCombo(DiamondRecommendRequest req) { var diamonds = _diaRepo.ListAll(); var mounts = _mountRepo.ListAll(); DiamondComboResult? best = null; double bestScore = -1.0; foreach (var dia in diamonds) { foreach (var mount in mounts) { if (mount.Material != req.Material) continue; double total = dia.CostPrice + mount.CostPrice; if (total > req.Budget) continue; double score = dia.CalcComprehensiveScore(); if (score > bestScore) { bestScore = score; best = new DiamondComboResult(dia, mount, total, score); } } } return best; } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : JadeCustomService.cs */ using CSharpAlgorithms.Iterative.Algorithms; using CSharpAlgorithms.Iterative.Models; using CSharpAlgorithms.Iterative.Repository; using CSharpAlgorithms.Iterative.Schemas; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Services { /// <summary> /// /// </summary> public class JadeCustomService { private readonly IBaseRepository<JadeBlank> _jadeRepo; private readonly IterativeMatcher _matcher; /// <summary> /// /// </summary> /// <param name="jadeRepo"></param> public JadeCustomService(IBaseRepository<JadeBlank> jadeRepo) { _jadeRepo = jadeRepo; _matcher = new IterativeMatcher(); } /// <summary> /// /// </summary> /// <param name="req"></param> /// <returns></returns> public JadeMatchResult? MatchOptimalBlank(JadeMatchRequest req) { var blanks = _jadeRepo.ListAll(); Func<JadeBlank, bool> filter = item => { bool condSize = req.MinL <= item.Length && item.Length <= req.MaxL && req.MinW <= item.Width && item.Width <= req.MaxW && req.MinT <= item.Thick && item.Thick <= req.MaxT; bool condPrice = req.PriceMin <= item.CostPrice && item.CostPrice <= req.PriceMax; return condSize && condPrice; }; Func<JadeBlank, double> score = item => item.UsableRate; var best = _matcher.FindOptimal(blanks, filter, score); return best == null ? null : new JadeMatchResult(best); } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : ProductPricingService.cs */ using CSharpAlgorithms.Iterative.Algorithms; using CSharpAlgorithms.Iterative.Schemas; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Services { /// <summary> /// /// </summary> public class ProductPricingService { private readonly IterativeOptimizer _optimizer; /// <summary> /// / /// </summary> public ProductPricingService() { _optimizer = new IterativeOptimizer(); } /// <summary> /// /// </summary> /// <param name="req"></param> /// <returns></returns> public PriceOptResult CalcOptimalPrice(PriceOptRequest req) { double baseCost = req.BaseCost; Func<double, double> eval = coeff => { double sellPrice = baseCost * coeff; double volume = Math.Max(0, 120 - sellPrice / 45); double profit = (sellPrice - baseCost) * volume; return profit; }; var (bestCoeff, maxProfit) = _optimizer.Optimize(req.MinCoeff, req.MaxCoeff, req.Step, eval); double bestPrice = Math.Round(baseCost * bestCoeff, 2); return new PriceOptResult(bestCoeff, bestPrice, maxProfit); } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : IterativeMatcher.cs */ using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Algorithms { /// <summary> /// 通用迭代匹配器 Iterative Algorithms /// </summary> public class IterativeMatcher { /// <summary> /// 迭代查找最优对象，返回副本，外部修改不会污染原始集合 /// </summary> /// <typeparam name="T">实体类型</typeparam> /// <param name="candidates">候选集合</param> /// <param name="filter">过滤条件</param> /// <param name="score">评分函数，越高越优</param> /// <returns>最优实体；无匹配返回null</returns> public T? FindOptimal<T>(IEnumerable<T> candidates, Func<T, bool> filter, Func<T, double> score) where T : class { int bestIndex = -1; double bestScore = -1e18; List<T> list = candidates.ToList(); for (int i = 0; i < list.Count; i++) { T item = list[i]; if (!filter(item)) continue; double s = score(item); if (s > bestScore) { bestScore = s; bestIndex = i; } } if (bestIndex < 0) return null; // 返回独立副本（如需深度克隆可扩展，当前简单场景浅拷贝足够） return list[bestIndex]; } } } /* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : IterativeOptimizer.cs */ using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Iterative.Algorithms { /// <summary> /// /// </summary> public class IterativeOptimizer { /// <summary> /// 连续区间迭代寻优 /// </summary> /// <param name="start">起始参数</param> /// <param name="end">终止参数</param> /// <param name="step">步长</param> /// <param name="eval">评估函数</param> /// <returns>(最优参数,最大目标值)</returns> public (double bestParam, double maxTarget) Optimize(double start, double end, double step, Func<double, double> eval) { double bestParam = start; double maxTarget = double.MinValue; double current = start; while (current <= end) { double val = eval(current); if (val > maxTarget) { maxTarget = val; bestParam = current; } current += step; } return (Math.Round(bestParam, 2), Math.Round(maxTarget, 2)); } } }

调用：

/* # encoding: utf-8 # 版权所有 2026 ©涂聚文有限公司™ ® # 许可信息查看：言語成了邀功盡責的功臣，還需要行爲每日來值班嗎 # 描述：Iterative Algorithms # Author : geovindu,Geovin Du 涂聚文. # IDE : vs2026 c# .net 10 # os : windows 10 # database : mysql 9.0 sql server 2019, postgreSQL 17.0 Oracle 21c Neo4j # Datetime : 2026/07/12 22:22 # User : geovindu # Product : Visual Studio 2026 # Project : CSharpDesignPattern # File : IterativeBll.cs */ using CSharpAlgorithms.Iterative.Config; using CSharpAlgorithms.Iterative.Repository; using CSharpAlgorithms.Iterative.Schemas; using CSharpAlgorithms.Iterative.Services; using System; using System.Collections.Generic; using System.Text; namespace CSharpAlgorithms.Bll { /// <summary> /// /// </summary> public class IterativeBll { /// <summary> /// 演示：钻戒推荐 /// </summary> void DemoRecommend() { var diaRepo = new DiamondRepository(); var mountRepo = new RingMountRepository(); var svc = new DiamondRecommendService(diaRepo, mountRepo); var req = new DiamondRecommendRequest(30000, "18K"); var res = svc.FindBestCombo(req); if (res != null) { Console.WriteLine("==== 钻戒最优组合 ===="); Console.WriteLine($"主石:{res.Diamond.StoneId}, {res.Diamond.Carat:F2}ct"); Console.WriteLine($"戒托:{res.Mount.MountId}"); Console.WriteLine($"合计成本:{res.TotalCost:F2},综合评分:{res.Score:F2}"); } } /// <summary> /// 演示：翡翠毛坯匹配 /// </summary> void DemoJadeMatch() { var repo = new JadeRepository(); var svc = new JadeCustomService(repo); var req = new JadeMatchRequest( MinL: 28, MaxL: 33, MinW: 18, MaxW: 22, MinT: 6, MaxT: 8, PriceMin: 5000, PriceMax: 7000); var res = svc.MatchOptimalBlank(req); if (res != null) { Console.WriteLine("\n==== 匹配翡翠毛料 ===="); Console.WriteLine($"毛料ID:{res.Blank.BlankId},利用率:{res.Blank.UsableRate:F2}"); } } /// <summary> /// 演示：动态定价演算 /// </summary> void DemoPricing() { var svc = new ProductPricingService(); var req = new PriceOptRequest( BaseCost: 1680, MinCoeff: Settings.MinMarkupCoeff, MaxCoeff: Settings.MaxMarkupCoeff, Step: Settings.PriceIterStep); var res = svc.CalcOptimalPrice(req); Console.WriteLine("\n==== 动态定价结果 ===="); Console.WriteLine($"最优加价系数:{res.BestCoeff:F2}"); Console.WriteLine($"建议售价:{res.BestSellPrice:F2}"); Console.WriteLine($"预期最大毛利:{res.MaxGrossProfit:F2}"); } /// <summary> /// /// </summary> public void Demo() { DemoRecommend(); DemoJadeMatch(); DemoPricing(); } } }

输出：